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KVM: MMU: rename is_largepage_backed to mapping_level 

With the new name and the corresponding backend changes this function
can now support multiple hugepage sizes.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2009-07-27 16:30:43 +02:00 committed by Avi Kivity
parent 44ad9944f1
commit d25797b24c
2 changed files with 69 additions and 35 deletions
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100
arch/x86/kvm/mmu.c
View File

@ -393,37 +393,52 @@ static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd)
* Return the pointer to the largepage write count for a given
* gfn, handling slots that are not large page aligned.
*/
static int *slot_largepage_idx(gfn_t gfn, struct kvm_memory_slot *slot)
static int *slot_largepage_idx(gfn_t gfn,
struct kvm_memory_slot *slot,
int level)
{
unsigned long idx;
idx = (gfn / KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL)) -
(slot->base_gfn / KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL));
return &slot->lpage_info[0][idx].write_count;
idx = (gfn / KVM_PAGES_PER_HPAGE(level)) -
(slot->base_gfn / KVM_PAGES_PER_HPAGE(level));
return &slot->lpage_info[level - 2][idx].write_count;
}
static void account_shadowed(struct kvm *kvm, gfn_t gfn)
{
struct kvm_memory_slot *slot;
int *write_count;
int i;
gfn = unalias_gfn(kvm, gfn);
write_count = slot_largepage_idx(gfn,
gfn_to_memslot_unaliased(kvm, gfn));
*write_count += 1;
slot = gfn_to_memslot_unaliased(kvm, gfn);
for (i = PT_DIRECTORY_LEVEL;
i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) {
write_count = slot_largepage_idx(gfn, slot, i);
*write_count += 1;
}
}
static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn)
{
struct kvm_memory_slot *slot;
int *write_count;
int i;
gfn = unalias_gfn(kvm, gfn);
write_count = slot_largepage_idx(gfn,
gfn_to_memslot_unaliased(kvm, gfn));
*write_count -= 1;
WARN_ON(*write_count < 0);
for (i = PT_DIRECTORY_LEVEL;
i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) {
slot = gfn_to_memslot_unaliased(kvm, gfn);
write_count = slot_largepage_idx(gfn, slot, i);
*write_count -= 1;
WARN_ON(*write_count < 0);
}
}
static int has_wrprotected_page(struct kvm *kvm, gfn_t gfn)
static int has_wrprotected_page(struct kvm *kvm,
gfn_t gfn,
int level)
{
struct kvm_memory_slot *slot;
int *largepage_idx;
@ -431,47 +446,67 @@ static int has_wrprotected_page(struct kvm *kvm, gfn_t gfn)
gfn = unalias_gfn(kvm, gfn);
slot = gfn_to_memslot_unaliased(kvm, gfn);
if (slot) {
largepage_idx = slot_largepage_idx(gfn, slot);
largepage_idx = slot_largepage_idx(gfn, slot, level);
return *largepage_idx;
}
return 1;
}
static int host_largepage_backed(struct kvm *kvm, gfn_t gfn)
static int host_mapping_level(struct kvm *kvm, gfn_t gfn)
{
unsigned long page_size = PAGE_SIZE;
struct vm_area_struct *vma;
unsigned long addr;
int ret = 0;
int i, ret = 0;
addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr))
return ret;
return page_size;
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm, addr);
if (vma && is_vm_hugetlb_page(vma))
ret = 1;
if (!vma)
goto out;
page_size = vma_kernel_pagesize(vma);
out:
up_read(&current->mm->mmap_sem);
for (i = PT_PAGE_TABLE_LEVEL;
i < (PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES); ++i) {
if (page_size >= KVM_HPAGE_SIZE(i))
ret = i;
else
break;
}
return ret;
}
static int is_largepage_backed(struct kvm_vcpu *vcpu, gfn_t large_gfn)
static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)
{
struct kvm_memory_slot *slot;
if (has_wrprotected_page(vcpu->kvm, large_gfn))
return 0;
if (!host_largepage_backed(vcpu->kvm, large_gfn))
return 0;
int host_level;
int level = PT_PAGE_TABLE_LEVEL;
slot = gfn_to_memslot(vcpu->kvm, large_gfn);
if (slot && slot->dirty_bitmap)
return 0;
return PT_PAGE_TABLE_LEVEL;
return 1;
host_level = host_mapping_level(vcpu->kvm, large_gfn);
if (host_level == PT_PAGE_TABLE_LEVEL)
return host_level;
for (level = PT_DIRECTORY_LEVEL; level <= host_level; ++level) {
if (has_wrprotected_page(vcpu->kvm, large_gfn, level))
break;
}
return level - 1;
}
/*
@ -1733,7 +1768,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
if ((pte_access & ACC_WRITE_MASK)
|| (write_fault && !is_write_protection(vcpu) && !user_fault)) {
if (largepage && has_wrprotected_page(vcpu->kvm, gfn)) {
if (largepage && has_wrprotected_page(vcpu->kvm, gfn, 1)) {
ret = 1;
spte = shadow_trap_nonpresent_pte;
goto set_pte;
@ -1884,8 +1919,7 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
pfn_t pfn;
unsigned long mmu_seq;
if (is_largepage_backed(vcpu, gfn &
~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1))) {
if (mapping_level(vcpu, gfn) == PT_DIRECTORY_LEVEL) {
gfn &= ~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1);
largepage = 1;
}
@ -2091,8 +2125,7 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
if (r)
return r;
if (is_largepage_backed(vcpu, gfn &
~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1))) {
if (mapping_level(vcpu, gfn) == PT_DIRECTORY_LEVEL) {
gfn &= ~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1);
largepage = 1;
}
@ -2494,7 +2527,8 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
return;
gfn = (gpte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
if (is_large_pte(gpte) && is_largepage_backed(vcpu, gfn)) {
if (is_large_pte(gpte) &&
(mapping_level(vcpu, gfn) == PT_DIRECTORY_LEVEL)) {
gfn &= ~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1);
vcpu->arch.update_pte.largepage = 1;
}

4
arch/x86/kvm/paging_tmpl.h
View File

@ -407,8 +407,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
if (walker.level == PT_DIRECTORY_LEVEL) {
gfn_t large_gfn;
large_gfn = walker.gfn &
~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1);
if (is_largepage_backed(vcpu, large_gfn)) {
~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1);
if (mapping_level(vcpu, large_gfn) == PT_DIRECTORY_LEVEL) {
walker.gfn = large_gfn;
largepage = 1;
}