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KVM: x86/mmu: Fold nonpaging_map() into nonpaging_page_fault() 

Fold nonpaging_map() into its sole caller, nonpaging_page_fault(), in
preparation for combining the bulk of nonpaging_page_fault() and
tdp_page_fault() into a common helper.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-12-06 15:57:16 -08:00 committed by Paolo Bonzini
parent ba7888dde6
commit 367fd790b1
1 changed files with 49 additions and 57 deletions
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106
arch/x86/kvm/mmu/mmu.c
View File

@ -3661,60 +3661,6 @@ static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
gpa_t cr2_or_gpa, kvm_pfn_t *pfn, bool write,
bool *writable);
static int nonpaging_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
gfn_t gfn, bool prefault)
{
int r;
int level;
bool force_pt_level;
kvm_pfn_t pfn;
unsigned long mmu_seq;
bool map_writable, write = error_code & PFERR_WRITE_MASK;
bool lpage_disallowed = (error_code & PFERR_FETCH_MASK) &&
is_nx_huge_page_enabled();
force_pt_level = lpage_disallowed;
level = mapping_level(vcpu, gfn, &force_pt_level);
if (likely(!force_pt_level)) {
/*
* This path builds a PAE pagetable - so we can map
* 2mb pages at maximum. Therefore check if the level
* is larger than that.
*/
if (level > PT_DIRECTORY_LEVEL)
level = PT_DIRECTORY_LEVEL;
gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1);
}
if (fast_page_fault(vcpu, gpa, level, error_code))
return RET_PF_RETRY;
mmu_seq = vcpu->kvm->mmu_notifier_seq;
smp_rmb();
if (try_async_pf(vcpu, prefault, gfn, gpa, &pfn, write, &map_writable))
return RET_PF_RETRY;
if (handle_abnormal_pfn(vcpu, gpa, gfn, pfn, ACC_ALL, &r))
return r;
r = RET_PF_RETRY;
spin_lock(&vcpu->kvm->mmu_lock);
if (mmu_notifier_retry(vcpu->kvm, mmu_seq))
goto out_unlock;
if (make_mmu_pages_available(vcpu) < 0)
goto out_unlock;
if (likely(!force_pt_level))
transparent_hugepage_adjust(vcpu, gfn, &pfn, &level);
r = __direct_map(vcpu, gpa, write, map_writable, level, pfn,
prefault, false);
out_unlock:
spin_unlock(&vcpu->kvm->mmu_lock);
kvm_release_pfn_clean(pfn);
return r;
}
static void mmu_free_root_page(struct kvm *kvm, hpa_t *root_hpa,
struct list_head *invalid_list)
{
@ -4176,12 +4122,21 @@ static void shadow_page_table_clear_flood(struct kvm_vcpu *vcpu, gva_t addr)
static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa,
u32 error_code, bool prefault)
{
gfn_t gfn = gpa >> PAGE_SHIFT;
int r;
int level;
kvm_pfn_t pfn;
unsigned long mmu_seq;
gfn_t gfn = gpa >> PAGE_SHIFT;
bool write = error_code & PFERR_WRITE_MASK;
bool force_pt_level, map_writable;
bool exec = error_code & PFERR_FETCH_MASK;
bool lpage_disallowed = exec && is_nx_huge_page_enabled();
/* Note, paging is disabled, ergo gva == gpa. */
pgprintk("%s: gva %lx error %x\n", __func__, gpa, error_code);
gpa &= PAGE_MASK;
if (page_fault_handle_page_track(vcpu, error_code, gfn))
return RET_PF_EMULATE;
@ -4191,9 +4146,46 @@ static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa,
MMU_WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa));
force_pt_level = lpage_disallowed;
level = mapping_level(vcpu, gfn, &force_pt_level);
if (likely(!force_pt_level)) {
/*
* This path builds a PAE pagetable - so we can map
* 2mb pages at maximum. Therefore check if the level
* is larger than that.
*/
if (level > PT_DIRECTORY_LEVEL)
level = PT_DIRECTORY_LEVEL;
return nonpaging_map(vcpu, gpa & PAGE_MASK,
error_code, gfn, prefault);
gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1);
}
if (fast_page_fault(vcpu, gpa, level, error_code))
return RET_PF_RETRY;
mmu_seq = vcpu->kvm->mmu_notifier_seq;
smp_rmb();
if (try_async_pf(vcpu, prefault, gfn, gpa, &pfn, write, &map_writable))
return RET_PF_RETRY;
if (handle_abnormal_pfn(vcpu, gpa, gfn, pfn, ACC_ALL, &r))
return r;
r = RET_PF_RETRY;
spin_lock(&vcpu->kvm->mmu_lock);
if (mmu_notifier_retry(vcpu->kvm, mmu_seq))
goto out_unlock;
if (make_mmu_pages_available(vcpu) < 0)
goto out_unlock;
if (likely(!force_pt_level))
transparent_hugepage_adjust(vcpu, gfn, &pfn, &level);
r = __direct_map(vcpu, gpa, write, map_writable, level, pfn,
prefault, false);
out_unlock:
spin_unlock(&vcpu->kvm->mmu_lock);
kvm_release_pfn_clean(pfn);
return r;
}
static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,