[PATCH 03/15] KVM: x86: avoid unnecessarily guest page table walking

Xiao Guangrong
2011-06-07T12:57:56Z

We already get the guest physical address, so use it to read guest data
directly to avoid walking guest page table again

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
arch/x86/kvm/x86.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 694538a..8be9ff6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3930,8 +3930,7 @@ static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
goto mmio;

- if (kvm_read_guest_virt(ctxt, addr, val, bytes, exception)
- == X86EMUL_CONTINUE)
+ if (!kvm_read_guest(vcpu->kvm, gpa, val, bytes))
return X86EMUL_CONTINUE;

mmio:
--
1.7.4.4