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nEPT: Move common code to paging_tmpl.h

Browse source 
For preparation, we just move gpte_access(), prefetch_invalid_gpte(),
s_rsvd_bits_set(), protect_clean_gpte() and is_dirty_gpte() from mmu.c
to paging_tmpl.h.

Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Nadav Har'El <nyh@il.ibm.com>
Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Xinhao Xu <xinhao.xu@intel.com>
Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Har'El 2013-08-05 11:07:09 +03:00 committed by Paolo Bonzini
parent b7e914501c
commit 0ad805a0c3
2 changed files with 69 additions and 67 deletions
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55
arch/x86/kvm/mmu.c
View file

@ -331,11 +331,6 @@ static int is_large_pte(u64 pte)
return pte & PT_PAGE_SIZE_MASK;
}
static int is_dirty_gpte(unsigned long pte)
{
return pte & PT_DIRTY_MASK;
}
static int is_rmap_spte(u64 pte)
{
return is_shadow_present_pte(pte);
@ -2574,14 +2569,6 @@ static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
mmu_free_roots(vcpu);
}
static bool is_rsvd_bits_set(struct kvm_mmu *mmu, u64 gpte, int level)
{
int bit7;
bit7 = (gpte >> 7) & 1;
return (gpte & mmu->rsvd_bits_mask[bit7][level-1]) != 0;
}
static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn,
bool no_dirty_log)
{
@ -2594,26 +2581,6 @@ static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn,
return gfn_to_pfn_memslot_atomic(slot, gfn);
}
static bool prefetch_invalid_gpte(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp, u64 *spte,
u64 gpte)
{
if (is_rsvd_bits_set(&vcpu->arch.mmu, gpte, PT_PAGE_TABLE_LEVEL))
goto no_present;
if (!is_present_gpte(gpte))
goto no_present;
if (!(gpte & PT_ACCESSED_MASK))
goto no_present;
return false;
no_present:
drop_spte(vcpu->kvm, spte);
return true;
}
static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp,
u64 *start, u64 *end)
@ -3501,18 +3468,6 @@ static void paging_free(struct kvm_vcpu *vcpu)
nonpaging_free(vcpu);
}
static inline void protect_clean_gpte(unsigned *access, unsigned gpte)
{
unsigned mask;
BUILD_BUG_ON(PT_WRITABLE_MASK != ACC_WRITE_MASK);
mask = (unsigned)~ACC_WRITE_MASK;
/* Allow write access to dirty gptes */
mask |= (gpte >> (PT_DIRTY_SHIFT - PT_WRITABLE_SHIFT)) & PT_WRITABLE_MASK;
*access &= mask;
}
static bool sync_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
unsigned access, int *nr_present)
{
@ -3530,16 +3485,6 @@ static bool sync_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
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;
}
static inline bool is_last_gpte(struct kvm_mmu *mmu, unsigned level, unsigned gpte)
{
unsigned index;

81
arch/x86/kvm/paging_tmpl.h
View file

@ -80,6 +80,31 @@ static gfn_t gpte_to_gfn_lvl(pt_element_t gpte, int lvl)
return (gpte & PT_LVL_ADDR_MASK(lvl)) >> PAGE_SHIFT;
}
static inline void FNAME(protect_clean_gpte)(unsigned *access, unsigned gpte)
{
unsigned mask;
BUILD_BUG_ON(PT_WRITABLE_MASK != ACC_WRITE_MASK);
mask = (unsigned)~ACC_WRITE_MASK;
/* Allow write access to dirty gptes */
mask |= (gpte >> (PT_DIRTY_SHIFT - PT_WRITABLE_SHIFT)) & PT_WRITABLE_MASK;
*access &= mask;
}
static bool FNAME(is_rsvd_bits_set)(struct kvm_mmu *mmu, u64 gpte, int level)
{
int bit7;
bit7 = (gpte >> 7) & 1;
return (gpte & mmu->rsvd_bits_mask[bit7][level-1]) != 0;
}
static inline int FNAME(is_present_gpte)(unsigned long pte)
{
return is_present_gpte(pte);
}
static int FNAME(cmpxchg_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
pt_element_t __user *ptep_user, unsigned index,
pt_element_t orig_pte, pt_element_t new_pte)
@ -103,6 +128,36 @@ static int FNAME(cmpxchg_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
return (ret != orig_pte);
}
static bool FNAME(prefetch_invalid_gpte)(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp, u64 *spte,
u64 gpte)
{
if (FNAME(is_rsvd_bits_set)(&vcpu->arch.mmu, gpte, PT_PAGE_TABLE_LEVEL))
goto no_present;
if (!FNAME(is_present_gpte)(gpte))
goto no_present;
if (!(gpte & PT_ACCESSED_MASK))
goto no_present;
return false;
no_present:
drop_spte(vcpu->kvm, spte);
return true;
}
static inline unsigned FNAME(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;
}
static int FNAME(update_accessed_dirty_bits)(struct kvm_vcpu *vcpu,
struct kvm_mmu *mmu,
struct guest_walker *walker,
@ -123,7 +178,8 @@ static int FNAME(update_accessed_dirty_bits)(struct kvm_vcpu *vcpu,
trace_kvm_mmu_set_accessed_bit(table_gfn, index, sizeof(pte));
pte |= PT_ACCESSED_MASK;
}
if (level == walker->level && write_fault && !is_dirty_gpte(pte)) {
if (level == walker->level && write_fault &&
!(pte & PT_DIRTY_MASK)) {
trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte));
pte |= PT_DIRTY_MASK;
}
@ -170,7 +226,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
if (walker->level == PT32E_ROOT_LEVEL) {
pte = mmu->get_pdptr(vcpu, (addr >> 30) & 3);
trace_kvm_mmu_paging_element(pte, walker->level);
if (!is_present_gpte(pte))
if (!FNAME(is_present_gpte)(pte))
goto error;
--walker->level;
}
@ -215,16 +271,17 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
trace_kvm_mmu_paging_element(pte, walker->level);
if (unlikely(!is_present_gpte(pte)))
if (unlikely(!FNAME(is_present_gpte)(pte)))
goto error;
if (unlikely(is_rsvd_bits_set(mmu, pte, walker->level))) {
if (unlikely(FNAME(is_rsvd_bits_set)(mmu, pte,
walker->level))) {
errcode |= PFERR_RSVD_MASK | PFERR_PRESENT_MASK;
goto error;
}
accessed_dirty &= pte;
pte_access = pt_access & gpte_access(vcpu, pte);
pte_access = pt_access & FNAME(gpte_access)(vcpu, pte);
walker->ptes[walker->level - 1] = pte;
} while (!is_last_gpte(mmu, walker->level, pte));
@ -247,7 +304,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
walker->gfn = real_gpa >> PAGE_SHIFT;
if (!write_fault)
protect_clean_gpte(&pte_access, pte);
FNAME(protect_clean_gpte)(&pte_access, pte);
else
/*
* On a write fault, fold the dirty bit into accessed_dirty by
@ -308,14 +365,14 @@ FNAME(prefetch_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
gfn_t gfn;
pfn_t pfn;
if (prefetch_invalid_gpte(vcpu, sp, spte, gpte))
if (FNAME(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);
pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
FNAME(protect_clean_gpte)(&pte_access, gpte);
pfn = pte_prefetch_gfn_to_pfn(vcpu, gfn,
no_dirty_log && (pte_access & ACC_WRITE_MASK));
if (is_error_pfn(pfn))
@ -784,15 +841,15 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
sizeof(pt_element_t)))
return -EINVAL;
if (prefetch_invalid_gpte(vcpu, sp, &sp->spt[i], gpte)) {
if (FNAME(prefetch_invalid_gpte)(vcpu, sp, &sp->spt[i], gpte)) {
vcpu->kvm->tlbs_dirty++;
continue;
}
gfn = gpte_to_gfn(gpte);
pte_access = sp->role.access;
pte_access &= gpte_access(vcpu, gpte);
protect_clean_gpte(&pte_access, gpte);
pte_access &= FNAME(gpte_access)(vcpu, gpte);
FNAME(protect_clean_gpte)(&pte_access, gpte);
if (sync_mmio_spte(vcpu->kvm, &sp->spt[i], gfn, pte_access,
&nr_present))