[PATCH v2 3/5] KVM: MMU: support apf for nonpaing guest

Xiao Guangrong
2010-11-12T06:49:11Z

Let's support apf for nonpaing guest

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
arch/x86/kvm/mmu.c | 12 +++++++++---
1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index f3fad4f..5ee5b97 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2286,7 +2286,11 @@ static int kvm_handle_bad_page(struct kvm *kvm, gfn_t gfn, pfn_t pfn)
return 1;
}

-static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
+static bool try_async_pf(struct kvm_vcpu *vcpu, bool no_apf, gfn_t gfn,
+ gva_t gva, pfn_t *pfn, bool write, bool *writable);
+
+static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn,
+ bool no_apf)
{
int r;
int level;
@@ -2307,7 +2311,9 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)

mmu_seq = vcpu->kvm->mmu_notifier_seq;
smp_rmb();
- pfn = gfn_to_pfn_prot(vcpu->kvm, gfn, write, &map_writable);
+
+ if (try_async_pf(vcpu, no_apf, gfn, v, &pfn, write, &map_writable))
+ return 0;

/* mmio */
if (is_error_pfn(pfn))
@@ -2594,7 +2600,7 @@ static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
gfn = gva >> PAGE_SHIFT;

return nonpaging_map(vcpu, gva & PAGE_MASK,
- error_code & PFERR_WRITE_MASK, gfn);
+ error_code & PFERR_WRITE_MASK, gfn, no_apf);
}

static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn)
--
1.7.0.4