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


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