^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Xen leaves the responsibility for maintaining p2m mappings to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * guests themselves, but it must also access and update the p2m array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * during suspend/resume when all the pages are reallocated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * The logical flat p2m table is mapped to a linear kernel memory area.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * For accesses by Xen a three-level tree linked via mfns only is set up to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * allow the address space to be sparse.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Xen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * p2m_top_mfn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * / \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * p2m_mid_mfn p2m_mid_mfn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * / /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * p2m p2m p2m ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * The p2m_mid_mfn pages are mapped by p2m_top_mfn_p.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * The p2m_top_mfn level is limited to 1 page, so the maximum representable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * pseudo-physical address space is:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * P2M_PER_PAGE depends on the architecture, as a mfn is always
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * unsigned long (8 bytes on 64-bit, 4 bytes on 32), leading to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * 512 and 1024 entries respectively.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * In short, these structures contain the Machine Frame Number (MFN) of the PFN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * However not all entries are filled with MFNs. Specifically for all other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * leaf entries, or for the top root, or middle one, for which there is a void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * entry, we assume it is "missing". So (for example)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * pfn_to_mfn(0x90909090)=INVALID_P2M_ENTRY.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * We have a dedicated page p2m_missing with all entries being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * INVALID_P2M_ENTRY. This page may be referenced multiple times in the p2m
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * list/tree in case there are multiple areas with P2M_PER_PAGE invalid pfns.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * We also have the possibility of setting 1-1 mappings on certain regions, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * that:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * pfn_to_mfn(0xc0000)=0xc0000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * The benefit of this is, that we can assume for non-RAM regions (think
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * PCI BARs, or ACPI spaces), we can create mappings easily because we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * get the PFN value to match the MFN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * For this to work efficiently we have one new page p2m_identity. All entries
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * in p2m_identity are set to INVALID_P2M_ENTRY type (Xen toolstack only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * recognizes that and MFNs, no other fancy value).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * On lookup we spot that the entry points to p2m_identity and return the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * identity value instead of dereferencing and returning INVALID_P2M_ENTRY.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * If the entry points to an allocated page, we just proceed as before and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * return the PFN. If the PFN has IDENTITY_FRAME_BIT set we unmask that in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * appropriate functions (pfn_to_mfn).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * The reason for having the IDENTITY_FRAME_BIT instead of just returning the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * PFN is that we could find ourselves where pfn_to_mfn(pfn)==pfn for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * non-identity pfn. To protect ourselves against we elect to set (and get) the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * IDENTITY_FRAME_BIT on all identity mapped PFNs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #include <linux/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #include <asm/cache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #include <asm/xen/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #include <asm/xen/hypercall.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #include <asm/xen/hypervisor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #include <xen/balloon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #include <xen/grant_table.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #include "multicalls.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #include "xen-ops.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #define P2M_MID_PER_PAGE (PAGE_SIZE / sizeof(unsigned long *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #define P2M_TOP_PER_PAGE (PAGE_SIZE / sizeof(unsigned long **))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #define MAX_P2M_PFN (P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #define PMDS_PER_MID_PAGE (P2M_MID_PER_PAGE / PTRS_PER_PTE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) unsigned long *xen_p2m_addr __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) EXPORT_SYMBOL_GPL(xen_p2m_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) unsigned long xen_p2m_size __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) EXPORT_SYMBOL_GPL(xen_p2m_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) unsigned long xen_max_p2m_pfn __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) EXPORT_SYMBOL_GPL(xen_max_p2m_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #ifdef CONFIG_XEN_MEMORY_HOTPLUG_LIMIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #define P2M_LIMIT CONFIG_XEN_MEMORY_HOTPLUG_LIMIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #define P2M_LIMIT 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static DEFINE_SPINLOCK(p2m_update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static unsigned long *p2m_mid_missing_mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static unsigned long *p2m_top_mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static unsigned long **p2m_top_mfn_p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static unsigned long *p2m_missing;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static unsigned long *p2m_identity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static pte_t *p2m_missing_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static pte_t *p2m_identity_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * Hint at last populated PFN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * Used to set HYPERVISOR_shared_info->arch.max_pfn so the toolstack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * can avoid scanning the whole P2M (which may be sized to account for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * hotplugged memory).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static unsigned long xen_p2m_last_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static inline unsigned p2m_top_index(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) BUG_ON(pfn >= MAX_P2M_PFN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return pfn / (P2M_MID_PER_PAGE * P2M_PER_PAGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static inline unsigned p2m_mid_index(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return (pfn / P2M_PER_PAGE) % P2M_MID_PER_PAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static inline unsigned p2m_index(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return pfn % P2M_PER_PAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static void p2m_top_mfn_init(unsigned long *top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) for (i = 0; i < P2M_TOP_PER_PAGE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) top[i] = virt_to_mfn(p2m_mid_missing_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static void p2m_top_mfn_p_init(unsigned long **top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) for (i = 0; i < P2M_TOP_PER_PAGE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) top[i] = p2m_mid_missing_mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static void p2m_mid_mfn_init(unsigned long *mid, unsigned long *leaf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) for (i = 0; i < P2M_MID_PER_PAGE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) mid[i] = virt_to_mfn(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static void p2m_init(unsigned long *p2m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) for (i = 0; i < P2M_PER_PAGE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) p2m[i] = INVALID_P2M_ENTRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static void p2m_init_identity(unsigned long *p2m, unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) for (i = 0; i < P2M_PER_PAGE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) p2m[i] = IDENTITY_FRAME(pfn + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static void * __ref alloc_p2m_page(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (unlikely(!slab_is_available())) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) void *ptr = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (!ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) __func__, PAGE_SIZE, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return (void *)__get_free_page(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static void __ref free_p2m_page(void *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (unlikely(!slab_is_available())) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) memblock_free((unsigned long)p, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) free_page((unsigned long)p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * Build the parallel p2m_top_mfn and p2m_mid_mfn structures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * This is called both at boot time, and after resuming from suspend:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * - At boot time we're called rather early, and must use alloc_bootmem*()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * to allocate memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * - After resume we're called from within stop_machine, but the mfn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * tree should already be completely allocated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) void __ref xen_build_mfn_list_list(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) unsigned long pfn, mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) pte_t *ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) unsigned int level, topidx, mididx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) unsigned long *mid_mfn_p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /* Pre-initialize p2m_top_mfn to be completely missing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (p2m_top_mfn == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) p2m_mid_missing_mfn = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) p2m_mid_mfn_init(p2m_mid_missing_mfn, p2m_missing);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) p2m_top_mfn_p = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) p2m_top_mfn_p_init(p2m_top_mfn_p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) p2m_top_mfn = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) p2m_top_mfn_init(p2m_top_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /* Reinitialise, mfn's all change after migration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) p2m_mid_mfn_init(p2m_mid_missing_mfn, p2m_missing);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) for (pfn = 0; pfn < xen_max_p2m_pfn && pfn < MAX_P2M_PFN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) pfn += P2M_PER_PAGE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) topidx = p2m_top_index(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) mididx = p2m_mid_index(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) mid_mfn_p = p2m_top_mfn_p[topidx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) ptep = lookup_address((unsigned long)(xen_p2m_addr + pfn),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) &level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) BUG_ON(!ptep || level != PG_LEVEL_4K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) mfn = pte_mfn(*ptep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) ptep = (pte_t *)((unsigned long)ptep & ~(PAGE_SIZE - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /* Don't bother allocating any mfn mid levels if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * they're just missing, just update the stored mfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * since all could have changed over a migrate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (ptep == p2m_missing_pte || ptep == p2m_identity_pte) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) BUG_ON(mididx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) BUG_ON(mid_mfn_p != p2m_mid_missing_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) p2m_top_mfn[topidx] = virt_to_mfn(p2m_mid_missing_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) pfn += (P2M_MID_PER_PAGE - 1) * P2M_PER_PAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (mid_mfn_p == p2m_mid_missing_mfn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) mid_mfn_p = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) p2m_mid_mfn_init(mid_mfn_p, p2m_missing);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) p2m_top_mfn_p[topidx] = mid_mfn_p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) p2m_top_mfn[topidx] = virt_to_mfn(mid_mfn_p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) mid_mfn_p[mididx] = mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) void xen_setup_mfn_list_list(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) virt_to_mfn(p2m_top_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) HYPERVISOR_shared_info->arch.max_pfn = xen_p2m_last_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) HYPERVISOR_shared_info->arch.p2m_generation = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) HYPERVISOR_shared_info->arch.p2m_vaddr = (unsigned long)xen_p2m_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) HYPERVISOR_shared_info->arch.p2m_cr3 =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /* Set up p2m_top to point to the domain-builder provided p2m pages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) void __init xen_build_dynamic_phys_to_machine(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) unsigned long pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) xen_p2m_addr = (unsigned long *)xen_start_info->mfn_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) xen_p2m_size = ALIGN(xen_start_info->nr_pages, P2M_PER_PAGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) for (pfn = xen_start_info->nr_pages; pfn < xen_p2m_size; pfn++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) xen_p2m_addr[pfn] = INVALID_P2M_ENTRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) xen_max_p2m_pfn = xen_p2m_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) #define P2M_TYPE_IDENTITY 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) #define P2M_TYPE_MISSING 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) #define P2M_TYPE_PFN 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) #define P2M_TYPE_UNKNOWN 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) static int xen_p2m_elem_type(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) unsigned long mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (pfn >= xen_p2m_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return P2M_TYPE_IDENTITY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) mfn = xen_p2m_addr[pfn];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (mfn == INVALID_P2M_ENTRY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return P2M_TYPE_MISSING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (mfn & IDENTITY_FRAME_BIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) return P2M_TYPE_IDENTITY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) return P2M_TYPE_PFN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) static void __init xen_rebuild_p2m_list(unsigned long *p2m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) unsigned int i, chunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) unsigned long pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) unsigned long *mfns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) pte_t *ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) pmd_t *pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) p2m_missing = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) p2m_init(p2m_missing);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) p2m_identity = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) p2m_init(p2m_identity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) p2m_missing_pte = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) paravirt_alloc_pte(&init_mm, __pa(p2m_missing_pte) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) p2m_identity_pte = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) paravirt_alloc_pte(&init_mm, __pa(p2m_identity_pte) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) for (i = 0; i < PTRS_PER_PTE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) set_pte(p2m_missing_pte + i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) pfn_pte(PFN_DOWN(__pa(p2m_missing)), PAGE_KERNEL_RO));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) set_pte(p2m_identity_pte + i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) pfn_pte(PFN_DOWN(__pa(p2m_identity)), PAGE_KERNEL_RO));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) for (pfn = 0; pfn < xen_max_p2m_pfn; pfn += chunk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * Try to map missing/identity PMDs or p2m-pages if possible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * We have to respect the structure of the mfn_list_list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) * which will be built just afterwards.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) * Chunk size to test is one p2m page if we are in the middle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * of a mfn_list_list mid page and the complete mid page area
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) * if we are at index 0 of the mid page. Please note that a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) * mid page might cover more than one PMD, e.g. on 32 bit PAE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) * kernels.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) chunk = (pfn & (P2M_PER_PAGE * P2M_MID_PER_PAGE - 1)) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) P2M_PER_PAGE : P2M_PER_PAGE * P2M_MID_PER_PAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) type = xen_p2m_elem_type(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (type != P2M_TYPE_PFN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) for (i = 1; i < chunk; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (xen_p2m_elem_type(pfn + i) != type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) if (i < chunk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) /* Reset to minimal chunk size. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) chunk = P2M_PER_PAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (type == P2M_TYPE_PFN || i < chunk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) /* Use initial p2m page contents. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) mfns = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) copy_page(mfns, xen_p2m_addr + pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) ptep = populate_extra_pte((unsigned long)(p2m + pfn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) set_pte(ptep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) pfn_pte(PFN_DOWN(__pa(mfns)), PAGE_KERNEL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) if (chunk == P2M_PER_PAGE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) /* Map complete missing or identity p2m-page. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) mfns = (type == P2M_TYPE_MISSING) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) p2m_missing : p2m_identity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) ptep = populate_extra_pte((unsigned long)(p2m + pfn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) set_pte(ptep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) pfn_pte(PFN_DOWN(__pa(mfns)), PAGE_KERNEL_RO));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) /* Complete missing or identity PMD(s) can be mapped. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) ptep = (type == P2M_TYPE_MISSING) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) p2m_missing_pte : p2m_identity_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) for (i = 0; i < PMDS_PER_MID_PAGE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) pmdp = populate_extra_pmd(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) (unsigned long)(p2m + pfn) + i * PMD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) set_pmd(pmdp, __pmd(__pa(ptep) | _KERNPG_TABLE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) void __init xen_vmalloc_p2m_tree(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) static struct vm_struct vm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) unsigned long p2m_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) xen_p2m_last_pfn = xen_max_p2m_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) p2m_limit = (phys_addr_t)P2M_LIMIT * 1024 * 1024 * 1024 / PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) vm.flags = VM_ALLOC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) vm.size = ALIGN(sizeof(unsigned long) * max(xen_max_p2m_pfn, p2m_limit),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) PMD_SIZE * PMDS_PER_MID_PAGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) vm_area_register_early(&vm, PMD_SIZE * PMDS_PER_MID_PAGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) pr_notice("p2m virtual area at %p, size is %lx\n", vm.addr, vm.size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) xen_max_p2m_pfn = vm.size / sizeof(unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) xen_rebuild_p2m_list(vm.addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) xen_p2m_addr = vm.addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) xen_p2m_size = xen_max_p2m_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) xen_inv_extra_mem();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) unsigned long get_phys_to_machine(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) pte_t *ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) unsigned int level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) if (unlikely(pfn >= xen_p2m_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (pfn < xen_max_p2m_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) return xen_chk_extra_mem(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) return IDENTITY_FRAME(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) ptep = lookup_address((unsigned long)(xen_p2m_addr + pfn), &level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) BUG_ON(!ptep || level != PG_LEVEL_4K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * The INVALID_P2M_ENTRY is filled in both p2m_*identity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * and in p2m_*missing, so returning the INVALID_P2M_ENTRY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * would be wrong.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (pte_pfn(*ptep) == PFN_DOWN(__pa(p2m_identity)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) return IDENTITY_FRAME(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) return xen_p2m_addr[pfn];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) EXPORT_SYMBOL_GPL(get_phys_to_machine);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) * Allocate new pmd(s). It is checked whether the old pmd is still in place.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) * If not, nothing is changed. This is okay as the only reason for allocating
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * a new pmd is to replace p2m_missing_pte or p2m_identity_pte by a individual
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) * pmd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) static pte_t *alloc_p2m_pmd(unsigned long addr, pte_t *pte_pg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) pte_t *ptechk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) pte_t *pte_newpg[PMDS_PER_MID_PAGE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) pmd_t *pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) unsigned int level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) /* Do all allocations first to bail out in error case. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) for (i = 0; i < PMDS_PER_MID_PAGE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) pte_newpg[i] = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if (!pte_newpg[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) for (i--; i >= 0; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) free_p2m_page(pte_newpg[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) vaddr = addr & ~(PMD_SIZE * PMDS_PER_MID_PAGE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) for (i = 0; i < PMDS_PER_MID_PAGE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) copy_page(pte_newpg[i], pte_pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) paravirt_alloc_pte(&init_mm, __pa(pte_newpg[i]) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) pmdp = lookup_pmd_address(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) BUG_ON(!pmdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) spin_lock_irqsave(&p2m_update_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) ptechk = lookup_address(vaddr, &level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) if (ptechk == pte_pg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) HYPERVISOR_shared_info->arch.p2m_generation++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) wmb(); /* Tools are synchronizing via p2m_generation. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) set_pmd(pmdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) __pmd(__pa(pte_newpg[i]) | _KERNPG_TABLE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) wmb(); /* Tools are synchronizing via p2m_generation. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) HYPERVISOR_shared_info->arch.p2m_generation++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) pte_newpg[i] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) spin_unlock_irqrestore(&p2m_update_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) if (pte_newpg[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) paravirt_release_pte(__pa(pte_newpg[i]) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) free_p2m_page(pte_newpg[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) vaddr += PMD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) return lookup_address(addr, &level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) * Fully allocate the p2m structure for a given pfn. We need to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) * that both the top and mid levels are allocated, and make sure the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) * parallel mfn tree is kept in sync. We may race with other cpus, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) * the new pages are installed with cmpxchg; if we lose the race then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) * simply free the page we allocated and use the one that's there.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) int xen_alloc_p2m_entry(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) unsigned topidx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) unsigned long *top_mfn_p, *mid_mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) pte_t *ptep, *pte_pg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) unsigned int level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) unsigned long addr = (unsigned long)(xen_p2m_addr + pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) unsigned long p2m_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) ptep = lookup_address(addr, &level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) BUG_ON(!ptep || level != PG_LEVEL_4K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) pte_pg = (pte_t *)((unsigned long)ptep & ~(PAGE_SIZE - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (pte_pg == p2m_missing_pte || pte_pg == p2m_identity_pte) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) /* PMD level is missing, allocate a new one */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) ptep = alloc_p2m_pmd(addr, pte_pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (!ptep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (p2m_top_mfn && pfn < MAX_P2M_PFN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) topidx = p2m_top_index(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) top_mfn_p = &p2m_top_mfn[topidx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) mid_mfn = READ_ONCE(p2m_top_mfn_p[topidx]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) BUG_ON(virt_to_mfn(mid_mfn) != *top_mfn_p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (mid_mfn == p2m_mid_missing_mfn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) /* Separately check the mid mfn level */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) unsigned long missing_mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) unsigned long mid_mfn_mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) unsigned long old_mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) mid_mfn = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) if (!mid_mfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) p2m_mid_mfn_init(mid_mfn, p2m_missing);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) missing_mfn = virt_to_mfn(p2m_mid_missing_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) mid_mfn_mfn = virt_to_mfn(mid_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) old_mfn = cmpxchg(top_mfn_p, missing_mfn, mid_mfn_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) if (old_mfn != missing_mfn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) free_p2m_page(mid_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) mid_mfn = mfn_to_virt(old_mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) p2m_top_mfn_p[topidx] = mid_mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) mid_mfn = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) p2m_pfn = pte_pfn(READ_ONCE(*ptep));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) if (p2m_pfn == PFN_DOWN(__pa(p2m_identity)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) p2m_pfn == PFN_DOWN(__pa(p2m_missing))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) /* p2m leaf page is missing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) unsigned long *p2m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) p2m = alloc_p2m_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) if (!p2m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (p2m_pfn == PFN_DOWN(__pa(p2m_missing)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) p2m_init(p2m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) p2m_init_identity(p2m, pfn & ~(P2M_PER_PAGE - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) spin_lock_irqsave(&p2m_update_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) if (pte_pfn(*ptep) == p2m_pfn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) HYPERVISOR_shared_info->arch.p2m_generation++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) wmb(); /* Tools are synchronizing via p2m_generation. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) set_pte(ptep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) pfn_pte(PFN_DOWN(__pa(p2m)), PAGE_KERNEL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) wmb(); /* Tools are synchronizing via p2m_generation. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) HYPERVISOR_shared_info->arch.p2m_generation++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (mid_mfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) mid_mfn[p2m_mid_index(pfn)] = virt_to_mfn(p2m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) p2m = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) spin_unlock_irqrestore(&p2m_update_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) if (p2m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) free_p2m_page(p2m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) /* Expanded the p2m? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) if (pfn >= xen_p2m_last_pfn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) xen_p2m_last_pfn = ALIGN(pfn + 1, P2M_PER_PAGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) HYPERVISOR_shared_info->arch.max_pfn = xen_p2m_last_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) EXPORT_SYMBOL(xen_alloc_p2m_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) unsigned long __init set_phys_range_identity(unsigned long pfn_s,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) unsigned long pfn_e)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) unsigned long pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) if (unlikely(pfn_s >= xen_p2m_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) if (pfn_s > pfn_e)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (pfn_e > xen_p2m_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) pfn_e = xen_p2m_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) for (pfn = pfn_s; pfn < pfn_e; pfn++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) xen_p2m_addr[pfn] = IDENTITY_FRAME(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) return pfn - pfn_s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) pte_t *ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) unsigned int level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) /* Only invalid entries allowed above the highest p2m covered frame. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) if (unlikely(pfn >= xen_p2m_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) return mfn == INVALID_P2M_ENTRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) * The interface requires atomic updates on p2m elements.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) * xen_safe_write_ulong() is using an atomic store via asm().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if (likely(!xen_safe_write_ulong(xen_p2m_addr + pfn, mfn)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) ptep = lookup_address((unsigned long)(xen_p2m_addr + pfn), &level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) BUG_ON(!ptep || level != PG_LEVEL_4K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) if (pte_pfn(*ptep) == PFN_DOWN(__pa(p2m_missing)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) return mfn == INVALID_P2M_ENTRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) if (pte_pfn(*ptep) == PFN_DOWN(__pa(p2m_identity)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) return mfn == IDENTITY_FRAME(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) if (unlikely(!__set_phys_to_machine(pfn, mfn))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) ret = xen_alloc_p2m_entry(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) return __set_phys_to_machine(pfn, mfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) struct gnttab_map_grant_ref *kmap_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) struct page **pages, unsigned int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) int i, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) if (xen_feature(XENFEAT_auto_translated_physmap))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) if (kmap_ops) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) kmap_ops, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) unsigned long mfn, pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) struct gnttab_unmap_grant_ref unmap[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) /* Do not add to override if the map failed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) if (map_ops[i].status != GNTST_okay ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) (kmap_ops && kmap_ops[i].status != GNTST_okay))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) if (map_ops[i].flags & GNTMAP_contains_pte) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) pte = (pte_t *)(mfn_to_virt(PFN_DOWN(map_ops[i].host_addr)) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) (map_ops[i].host_addr & ~PAGE_MASK));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) mfn = pte_mfn(*pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) mfn = PFN_DOWN(map_ops[i].dev_bus_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) pfn = page_to_pfn(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) WARN(pfn_to_mfn(pfn) != INVALID_P2M_ENTRY, "page must be ballooned");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) if (likely(set_phys_to_machine(pfn, FOREIGN_FRAME(mfn))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) * Signal an error for this slot. This in turn requires
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) * immediate unmapping.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) map_ops[i].status = GNTST_general_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) unmap[0].host_addr = map_ops[i].host_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) unmap[0].handle = map_ops[i].handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) map_ops[i].handle = ~0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) if (map_ops[i].flags & GNTMAP_device_map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) unmap[0].dev_bus_addr = map_ops[i].dev_bus_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) unmap[0].dev_bus_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) if (kmap_ops) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) kmap_ops[i].status = GNTST_general_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) unmap[1].host_addr = kmap_ops[i].host_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) unmap[1].handle = kmap_ops[i].handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) kmap_ops[i].handle = ~0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) if (kmap_ops[i].flags & GNTMAP_device_map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) unmap[1].dev_bus_addr = kmap_ops[i].dev_bus_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) unmap[1].dev_bus_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) * Pre-populate both status fields, to be recognizable in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) * the log message below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) unmap[0].status = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) unmap[1].status = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) rc = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) unmap, 1 + !!kmap_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) if (rc || unmap[0].status != GNTST_okay ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) unmap[1].status != GNTST_okay)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) pr_err_once("gnttab unmap failed: rc=%d st0=%d st1=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) rc, unmap[0].status, unmap[1].status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) EXPORT_SYMBOL_GPL(set_foreign_p2m_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) struct gnttab_unmap_grant_ref *kunmap_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) struct page **pages, unsigned int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) int i, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) if (xen_feature(XENFEAT_auto_translated_physmap))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) unsigned long mfn = __pfn_to_mfn(page_to_pfn(pages[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) unsigned long pfn = page_to_pfn(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) if (mfn != INVALID_P2M_ENTRY && (mfn & FOREIGN_FRAME_BIT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) if (kunmap_ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) kunmap_ops, count) ?: ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) EXPORT_SYMBOL_GPL(clear_foreign_p2m_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) #ifdef CONFIG_XEN_DEBUG_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) #include "debugfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) static int p2m_dump_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) static const char * const type_name[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) [P2M_TYPE_IDENTITY] = "identity",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) [P2M_TYPE_MISSING] = "missing",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) [P2M_TYPE_PFN] = "pfn",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) [P2M_TYPE_UNKNOWN] = "abnormal"};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) unsigned long pfn, first_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) int type, prev_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) prev_type = xen_p2m_elem_type(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) first_pfn = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) for (pfn = 0; pfn < xen_p2m_size; pfn++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) type = xen_p2m_elem_type(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) if (type != prev_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) seq_printf(m, " [0x%lx->0x%lx] %s\n", first_pfn, pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) type_name[prev_type]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) prev_type = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) first_pfn = pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) seq_printf(m, " [0x%lx->0x%lx] %s\n", first_pfn, pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) type_name[prev_type]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) static int p2m_dump_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) return single_open(filp, p2m_dump_show, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) static const struct file_operations p2m_dump_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) .open = p2m_dump_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) .read = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) .llseek = seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) .release = single_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) static struct dentry *d_mmu_debug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) static int __init xen_p2m_debugfs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) struct dentry *d_xen = xen_init_debugfs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) d_mmu_debug = debugfs_create_dir("mmu", d_xen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) debugfs_create_file("p2m", 0600, d_mmu_debug, NULL, &p2m_dump_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) fs_initcall(xen_p2m_debugfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) #endif /* CONFIG_XEN_DEBUG_FS */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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