forge/linux-uconsole
1
0
Fork 0
Code Issues 1 Pull requests Projects Releases Packages Wiki Activity Actions

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

Browse source 
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
commit 3295dc04af
1 changed files with 3 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

3
arch/x86/kvm/x86.c
View file

@ -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: