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KVM: Simply gfn_to_page()

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Mapping a guest page to a host page is a common operation.  Currently,
one has first to find the memory slot where the page belongs (gfn_to_memslot),
then locate the page itself (gfn_to_page()).

This is clumsy, and also won't work well with memory aliases.  So simplify
gfn_to_page() not to require memory slot translation first, and instead do it
internally.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity
2007-03-30 14:02:32 +03:00
parent e0fa826f96
commit 954bbbc236
4 changed files with 33 additions and 42 deletions
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12
drivers/kvm/kvm.h
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@@ -443,11 +443,7 @@ void kvm_emulator_want_group7_invlpg(void);
extern hpa_t bad_page_address;
static inline struct page *gfn_to_page(struct kvm_memory_slot *slot, gfn_t gfn)
{
return slot->phys_mem[gfn - slot->base_gfn];
}
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
@@ -523,12 +519,6 @@ static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
return vcpu->mmu.page_fault(vcpu, gva, error_code);
}
static inline struct page *_gfn_to_page(struct kvm *kvm, gfn_t gfn)
{
struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
return (slot) ? slot->phys_mem[gfn - slot->base_gfn] : NULL;
}
static inline int is_long_mode(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_X86_64