KVM: x86: correct async page present tracepoint

[ Upstream commit 24dccf83a121b8a4ad5c2ad383a8184ef6c266ee ]

After async pf setup successfully, there is a broadcast wakeup w/ special
token 0xffffffff which tells vCPU that it should wake up all processes
waiting for APFs though there is no real process waiting at the moment.

The async page present tracepoint print prematurely and fails to catch the
special token setup. This patch fixes it by moving the async page present
tracepoint after the special token setup.

Before patch:

qemu-system-x86-8499  [006] ...1  5973.473292: kvm_async_pf_ready: token 0x0 gva 0x0

After patch:

qemu-system-x86-8499  [006] ...1  5973.473292: kvm_async_pf_ready: token 0xffffffff gva 0x0

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 26329e8c98558a1c455fa95e0d3e5577e29c0bee..c8105be39b00886a6a24d447f5573f4bbf0f6770 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7783,11 +7783,11 @@ void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
 {
        struct x86_exception fault;
 
-       trace_kvm_async_pf_ready(work->arch.token, work->gva);
        if (work->wakeup_all)
                work->arch.token = ~0; /* broadcast wakeup */
        else
                kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
+       trace_kvm_async_pf_ready(work->arch.token, work->gva);
 
        if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) &&
            !apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) {