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OpenCloudOS-Kernel
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KVM: MMU: Move gpte_access() out of paging_tmpl.h 

We no longer rely on paging_tmpl.h defines; so we can move the function
to mmu.c.

Rely on zero extension to 64 bits to get the correct nx behaviour.

Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2012-09-12 14:03:28 +03:00
parent edc2ae84eb
commit 3d34adec70
2 changed files with 15 additions and 16 deletions
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10
arch/x86/kvm/mmu.c
View File

@ -3437,6 +3437,16 @@ static bool sync_mmio_spte(u64 *sptep, gfn_t gfn, unsigned access,
return false;
}
static inline unsigned gpte_access(struct kvm_vcpu *vcpu, u64 gpte)
{
unsigned access;
access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK;
access &= ~(gpte >> PT64_NX_SHIFT);
return access;
}
#define PTTYPE 64
#include "paging_tmpl.h"
#undef PTTYPE

21
arch/x86/kvm/paging_tmpl.h
View File

@ -101,17 +101,6 @@ static int FNAME(cmpxchg_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
return (ret != orig_pte);
}
static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte)
{
unsigned access;
access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK;
#if PTTYPE == 64
access &= ~(gpte >> PT64_NX_SHIFT);
#endif
return access;
}
static bool FNAME(is_last_gpte)(struct guest_walker *walker,
struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
pt_element_t gpte)
@ -217,7 +206,7 @@ retry_walk:
last_gpte = FNAME(is_last_gpte)(walker, vcpu, mmu, pte);
if (last_gpte) {
pte_access = pt_access & FNAME(gpte_access)(vcpu, pte);
pte_access = pt_access & gpte_access(vcpu, pte);
/* check if the kernel is fetching from user page */
if (unlikely(pte_access & PT_USER_MASK) &&
kvm_read_cr4_bits(vcpu, X86_CR4_SMEP))
@ -268,7 +257,7 @@ retry_walk:
break;
}
pt_access &= FNAME(gpte_access)(vcpu, pte);
pt_access &= gpte_access(vcpu, pte);
--walker->level;
}
@ -364,7 +353,7 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
return;
pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte);
pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
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 (mmu_invalid_pfn(pfn))
@ -438,7 +427,7 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
if (FNAME(prefetch_invalid_gpte)(vcpu, sp, spte, gpte))
continue;
pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
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,
@ -791,7 +780,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
gfn = gpte_to_gfn(gpte);
pte_access = sp->role.access;
pte_access &= FNAME(gpte_access)(vcpu, gpte);
pte_access &= gpte_access(vcpu, gpte);
protect_clean_gpte(&pte_access, gpte);
if (sync_mmio_spte(&sp->spt[i], gfn, pte_access, &nr_present))