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KVM: selftests: Add PTE helper for x86-64 in preparation for hugepages

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Add a helper to retrieve a PTE pointer given a PFN, address, and level
in preparation for adding hugepage support.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622200529.3650424-17-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-06-22 13:05:26 -07:00 committed by Paolo Bonzini
parent 6d96ca6a60
commit f681d6861b
1 changed files with 31 additions and 28 deletions
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59
tools/testing/selftests/kvm/lib/x86_64/processor.c
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@ -216,10 +216,21 @@ void virt_pgd_alloc(struct kvm_vm *vm)
}
}
static void *virt_get_pte(struct kvm_vm *vm, uint64_t pt_pfn, uint64_t vaddr,
int level)
{
uint64_t *page_table = addr_gpa2hva(vm, pt_pfn << vm->page_shift);
int index = vaddr >> (vm->page_shift + level * 9) & 0x1ffu;
return &page_table[index];
}
void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr)
{
uint16_t index[4];
struct pageMapL4Entry *pml4e;
struct pageDirectoryPointerEntry *pdpe;
struct pageDirectoryEntry *pde;
struct pageTableEntry *pte;
TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use "
"unknown or unsupported guest mode, mode: 0x%x", vm->mode);
@ -241,43 +252,35 @@ void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr)
" paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
paddr, vm->max_gfn, vm->page_size);
index[0] = (vaddr >> 12) & 0x1ffu;
index[1] = (vaddr >> 21) & 0x1ffu;
index[2] = (vaddr >> 30) & 0x1ffu;
index[3] = (vaddr >> 39) & 0x1ffu;
/* Allocate page directory pointer table if not present. */
pml4e = addr_gpa2hva(vm, vm->pgd);
if (!pml4e[index[3]].present) {
pml4e[index[3]].pfn = vm_alloc_page_table(vm) >> vm->page_shift;
pml4e[index[3]].writable = true;
pml4e[index[3]].present = true;
pml4e = virt_get_pte(vm, vm->pgd >> vm->page_shift, vaddr, 3);
if (!pml4e->present) {
pml4e->pfn = vm_alloc_page_table(vm) >> vm->page_shift;
pml4e->writable = true;
pml4e->present = true;
}
/* Allocate page directory table if not present. */
struct pageDirectoryPointerEntry *pdpe;
pdpe = addr_gpa2hva(vm, pml4e[index[3]].pfn * vm->page_size);
if (!pdpe[index[2]].present) {
pdpe[index[2]].pfn = vm_alloc_page_table(vm) >> vm->page_shift;
pdpe[index[2]].writable = true;
pdpe[index[2]].present = true;
pdpe = virt_get_pte(vm, pml4e->pfn, vaddr, 2);
if (!pdpe->present) {
pdpe->pfn = vm_alloc_page_table(vm) >> vm->page_shift;
pdpe->writable = true;
pdpe->present = true;
}
/* Allocate page table if not present. */
struct pageDirectoryEntry *pde;
pde = addr_gpa2hva(vm, pdpe[index[2]].pfn * vm->page_size);
if (!pde[index[1]].present) {
pde[index[1]].pfn = vm_alloc_page_table(vm) >> vm->page_shift;
pde[index[1]].writable = true;
pde[index[1]].present = true;
pde = virt_get_pte(vm, pdpe->pfn, vaddr, 1);
if (!pde->present) {
pde->pfn = vm_alloc_page_table(vm) >> vm->page_shift;
pde->writable = true;
pde->present = true;
}
/* Fill in page table entry. */
struct pageTableEntry *pte;
pte = addr_gpa2hva(vm, pde[index[1]].pfn * vm->page_size);
pte[index[0]].pfn = paddr >> vm->page_shift;
pte[index[0]].writable = true;
pte[index[0]].present = 1;
pte = virt_get_pte(vm, pde->pfn, vaddr, 0);
pte->pfn = paddr >> vm->page_shift;
pte->writable = true;
pte->present = 1;
}
void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)