KVM: x86: Relocate MMIO exit stats counting

Move the stat.mmio_exits update into x86_emulate_instruction().  This is
both a bug fix, e.g. the current update flows will incorrectly increment
mmio_exits on emulation failure, and a preparatory change to set the
stage for eliminating EMULATE_DONE and company.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index a10af9c..138dcde 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -5456,8 +5456,6 @@ emulate:
        case EMULATE_DONE:
                return 1;
        case EMULATE_USER_EXIT:
-               ++vcpu->stat.mmio_exits;
-               /* fall through */
        case EMULATE_FAIL:
                return 0;
        default:

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 8bab3e5..8f61250 100644 (file)
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5201,7 +5201,6 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
                err = kvm_emulate_instruction(vcpu, 0);
 
                if (err == EMULATE_USER_EXIT) {
-                       ++vcpu->stat.mmio_exits;
                        ret = 0;
                        goto out;
                }

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7e51924..2b92c2c 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6703,6 +6703,8 @@ restart:
                }
                r = EMULATE_USER_EXIT;
        } else if (vcpu->mmio_needed) {
+               ++vcpu->stat.mmio_exits;
+
                if (!vcpu->mmio_is_write)
                        writeback = false;
                r = EMULATE_USER_EXIT;