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KVM: MMU: introduce FNAME(prefetch_gpte)

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The only difference between FNAME(update_pte) and FNAME(pte_prefetch)
is that the former is allowed to prefetch gfn from dirty logged slot,
so introduce a common function to prefetch spte

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2012-10-16 20:10:12 +08:00 • committed by Avi Kivity
parent a052b42b0e
commit bd6360cc0a
1 changed files with 34 additions and 41 deletions
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75
arch/x86/kvm/paging_tmpl.h
View file

@ -305,31 +305,43 @@ static int FNAME(walk_addr_nested)(struct guest_walker *walker,
addr, access); addr, access);
} }
static bool
FNAME(prefetch_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
u64 *spte, pt_element_t gpte, bool no_dirty_log)
{
unsigned pte_access;
gfn_t gfn;
pfn_t pfn;
if (prefetch_invalid_gpte(vcpu, sp, spte, gpte))
return false;
pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte);
gfn = gpte_to_gfn(gpte);
pte_access = sp->role.access & gpte_access(vcpu, gpte);
protect_clean_gpte(&pte_access, gpte);
pfn = pte_prefetch_gfn_to_pfn(vcpu, gfn,
no_dirty_log && (pte_access & ACC_WRITE_MASK));
if (is_invalid_pfn(pfn))
return false;
/*
* we call mmu_set_spte() with host_writable = true because
* pte_prefetch_gfn_to_pfn always gets a writable pfn.
*/
mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0,
NULL, PT_PAGE_TABLE_LEVEL, gfn, pfn, true, true);
return true;
}
static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
u64 *spte, const void *pte) u64 *spte, const void *pte)
{ {
pt_element_t gpte; pt_element_t gpte = *(const pt_element_t *)pte;
unsigned pte_access;
pfn_t pfn;
gpte = *(const pt_element_t *)pte; FNAME(prefetch_gpte)(vcpu, sp, spte, gpte, false);
if (prefetch_invalid_gpte(vcpu, sp, spte, gpte))
return;
pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte);
pte_access = sp->role.access & gpte_access(vcpu, gpte);
protect_clean_gpte(&pte_access, gpte);
pfn = gfn_to_pfn_atomic(vcpu->kvm, gpte_to_gfn(gpte));
if (is_invalid_pfn(pfn))
return;
/*
* we call mmu_set_spte() with host_writable = true because that
* vcpu->arch.update_pte.pfn was fetched from get_user_pages(write = 1).
*/
mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0,
NULL, PT_PAGE_TABLE_LEVEL,
gpte_to_gfn(gpte), pfn, true, true);
} }
static bool FNAME(gpte_changed)(struct kvm_vcpu *vcpu, static bool FNAME(gpte_changed)(struct kvm_vcpu *vcpu,
@ -375,33 +387,14 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
spte = sp->spt + i; spte = sp->spt + i;
for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) { for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) {
pt_element_t gpte;
unsigned pte_access;
gfn_t gfn;
pfn_t pfn;
if (spte == sptep) if (spte == sptep)
continue; continue;
if (is_shadow_present_pte(*spte)) if (is_shadow_present_pte(*spte))
continue; continue;
gpte = gptep[i]; if (!FNAME(prefetch_gpte)(vcpu, sp, spte, gptep[i], true))
if (prefetch_invalid_gpte(vcpu, sp, spte, gpte))
continue;
pte_access = sp->role.access & gpte_access(vcpu, gpte);
protect_clean_gpte(&pte_access, gpte);
gfn = gpte_to_gfn(gpte);
pfn = pte_prefetch_gfn_to_pfn(vcpu, gfn,
pte_access & ACC_WRITE_MASK);
if (is_invalid_pfn(pfn))
break; break;
mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0,
NULL, PT_PAGE_TABLE_LEVEL, gfn,
pfn, true, true);
} }
} }