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KVM: MMU: abstract invalid guest pte mapping

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Introduce a common function to map invalid gpte

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-11-23 11:08:42 +08:00 committed by Avi Kivity
parent a4a8e6f76e
commit 407c61c6bd
2 changed files with 36 additions and 36 deletions
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3
arch/x86/kvm/mmu.c
View File

@ -3075,9 +3075,6 @@ static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
return;
}
if (is_rsvd_bits_set(&vcpu->arch.mmu, *(u64 *)new, PT_PAGE_TABLE_LEVEL))
return;
++vcpu->kvm->stat.mmu_pte_updated;
if (!sp->role.cr4_pae)
paging32_update_pte(vcpu, sp, spte, new);

69
arch/x86/kvm/paging_tmpl.h
View File

@ -299,25 +299,42 @@ static int FNAME(walk_addr_nested)(struct guest_walker *walker,
addr, access);
}
static bool FNAME(prefetch_invalid_gpte)(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp, u64 *spte,
pt_element_t gpte)
{
u64 nonpresent = shadow_trap_nonpresent_pte;
if (is_rsvd_bits_set(&vcpu->arch.mmu, gpte, PT_PAGE_TABLE_LEVEL))
goto no_present;
if (!is_present_gpte(gpte)) {
if (!sp->unsync)
nonpresent = shadow_notrap_nonpresent_pte;
goto no_present;
}
if (!(gpte & PT_ACCESSED_MASK))
goto no_present;
return false;
no_present:
drop_spte(vcpu->kvm, spte, nonpresent);
return true;
}
static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
u64 *spte, const void *pte)
{
pt_element_t gpte;
unsigned pte_access;
pfn_t pfn;
u64 new_spte;
gpte = *(const pt_element_t *)pte;
if (~gpte & (PT_PRESENT_MASK | PT_ACCESSED_MASK)) {
if (!is_present_gpte(gpte)) {
if (sp->unsync)
new_spte = shadow_trap_nonpresent_pte;
else
new_spte = shadow_notrap_nonpresent_pte;
__set_spte(spte, new_spte);
}
if (FNAME(prefetch_invalid_gpte)(vcpu, sp, spte, gpte))
return;
}
pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte);
pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
if (gpte_to_gfn(gpte) != vcpu->arch.update_pte.gfn)
@ -364,7 +381,6 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
u64 *sptep)
{
struct kvm_mmu_page *sp;
struct kvm_mmu *mmu = &vcpu->arch.mmu;
pt_element_t *gptep = gw->prefetch_ptes;
u64 *spte;
int i;
@ -395,16 +411,7 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
gpte = gptep[i];
if (is_rsvd_bits_set(mmu, gpte, PT_PAGE_TABLE_LEVEL))
continue;
if (!is_present_gpte(gpte)) {
if (!sp->unsync)
__set_spte(spte, shadow_notrap_nonpresent_pte);
continue;
}
if (!(gpte & PT_ACCESSED_MASK))
if (FNAME(prefetch_invalid_gpte)(vcpu, sp, spte, gpte))
continue;
pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
@ -761,7 +768,6 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
pt_element_t gpte;
gpa_t pte_gpa;
gfn_t gfn;
bool rsvd_bits_set;
if (!is_shadow_present_pte(sp->spt[i]))
continue;
@ -773,18 +779,15 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
return -EINVAL;
gfn = gpte_to_gfn(gpte);
rsvd_bits_set = is_rsvd_bits_set(&vcpu->arch.mmu, gpte,
PT_PAGE_TABLE_LEVEL);
if (rsvd_bits_set || gfn != sp->gfns[i] ||
!is_present_gpte(gpte) || !(gpte & PT_ACCESSED_MASK)) {
u64 nonpresent;
if (rsvd_bits_set || is_present_gpte(gpte) ||
sp->unsync)
nonpresent = shadow_trap_nonpresent_pte;
else
nonpresent = shadow_notrap_nonpresent_pte;
drop_spte(vcpu->kvm, &sp->spt[i], nonpresent);
if (FNAME(prefetch_invalid_gpte)(vcpu, sp, &sp->spt[i], gpte)) {
kvm_flush_remote_tlbs(vcpu->kvm);
continue;
}
if (gfn != sp->gfns[i]) {
drop_spte(vcpu->kvm, &sp->spt[i],
shadow_trap_nonpresent_pte);
kvm_flush_remote_tlbs(vcpu->kvm);
continue;
}