Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/crash_dump.h>
 
#include <xen/interface/xen.h>
#include <xen/hvm.h>
 
#include "mmu.h"
 
#ifdef CONFIG_PROC_VMCORE
/*
 * This function is used in two contexts:
 * - the kdump kernel has to check whether a pfn of the crashed kernel
 *   was a ballooned page. vmcore is using this function to decide
 *   whether to access a pfn of the crashed kernel.
 * - the kexec kernel has to check whether a pfn was ballooned by the
 *   previous kernel. If the pfn is ballooned, handle it properly.
 * Returns 0 if the pfn is not backed by a RAM page, the caller may
 * handle the pfn special in this case.
 */
static int xen_oldmem_pfn_is_ram(unsigned long pfn)
{
<------>struct xen_hvm_get_mem_type a = {
<------><------>.domid = DOMID_SELF,
<------><------>.pfn = pfn,
<------>};
<------>int ram;
 
<------>if (HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a))
<------><------>return -ENXIO;
 
<------>switch (a.mem_type) {
<------>case HVMMEM_mmio_dm:
<------><------>ram = 0;
<------><------>break;
<------>case HVMMEM_ram_rw:
<------>case HVMMEM_ram_ro:
<------>default:
<------><------>ram = 1;
<------><------>break;
<------>}
 
<------>return ram;
}
#endif
 
static void xen_hvm_exit_mmap(struct mm_struct *mm)
{
<------>struct xen_hvm_pagetable_dying a;
<------>int rc;
 
<------>a.domid = DOMID_SELF;
<------>a.gpa = __pa(mm->pgd);
<------>rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
<------>WARN_ON_ONCE(rc < 0);
}
 
static int is_pagetable_dying_supported(void)
{
<------>struct xen_hvm_pagetable_dying a;
<------>int rc = 0;
 
<------>a.domid = DOMID_SELF;
<------>a.gpa = 0x00;
<------>rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
<------>if (rc < 0) {
<------><------>printk(KERN_DEBUG "HVMOP_pagetable_dying not supported\n");
<------><------>return 0;
<------>}
<------>return 1;
}
 
void __init xen_hvm_init_mmu_ops(void)
{
<------>if (is_pagetable_dying_supported())
<------><------>pv_ops.mmu.exit_mmap = xen_hvm_exit_mmap;
#ifdef CONFIG_PROC_VMCORE
<------>WARN_ON(register_oldmem_pfn_is_ram(&xen_oldmem_pfn_is_ram));
#endif
}