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KVM: x86: Account fastpath-only VM-Exits in vCPU stats

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commit 8b703a49c9 upstream.

Increment vcpu->stat.exits when handling a fastpath VM-Exit without
going through any part of the "slow" path.  Not bumping the exits stat
can result in wildly misleading exit counts, e.g. if the primary reason
the guest is exiting is to program the TSC deadline timer.

Fixes: 404d5d7bff ("KVM: X86: Introduce more exit_fastpath_completion enum values")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230602011920.787844-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Christopherson
2023-06-01 18:19:19 -07:00
committed by Greg Kroah-Hartman
parent 808ed7d86e
commit 8a870c07a1
1 changed files with 3 additions and 0 deletions
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arch/x86/kvm/x86.c
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@@ -9946,6 +9946,9 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
exit_fastpath = EXIT_FASTPATH_EXIT_HANDLED;
break;
}
/* Note, VM-Exits that go down the "slow" path are accounted below. */
++vcpu->stat.exits;
}
/*