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

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commit 8b703a49c9df5e74870381ad7ba9c85d8a74ed2c 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 21bb3cd2e1
commit 3295dc04af
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/x86.c
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@ -1588,6 +1588,9 @@ bool kvm_msr_allowed(struct kvm_vcpu *vcpu, u32 index, u32 type)
allowed = !!test_bit(index - start, bitmap);
break;
}
/* Note, VM-Exits that go down the "slow" path are accounted below. */
++vcpu->stat.exits;
}
out: