This is a note to let you know that I've just added the patch titled
KVM: x86: Account fastpath-only VM-Exits in vCPU stats
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-x86-account-fastpath-only-vm-exits-in-vcpu-stats.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8b703a49c9df5e74870381ad7ba9c85d8a74ed2c Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Thu, 1 Jun 2023 18:19:19 -0700
Subject: KVM: x86: Account fastpath-only VM-Exits in vCPU stats
From: Sean Christopherson <seanjc@xxxxxxxxxx>
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: 404d5d7bff0d ("KVM: X86: Introduce more exit_fastpath_completion enum values")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230602011920.787844-2-seanjc@xxxxxxxxxx
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/x86.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10682,6 +10682,9 @@ static int vcpu_enter_guest(struct kvm_v
exit_fastpath = EXIT_FASTPATH_EXIT_HANDLED;
break;
}
+
+ /* Note, VM-Exits that go down the "slow" path are accounted below. */
+ ++vcpu->stat.exits;
}
/*
Patches currently in stable-queue which might be from seanjc@xxxxxxxxxx are
queue-6.3/kvm-x86-bail-from-kvm_recalculate_phys_map-if-x2apic-id-is-out-of-bounds.patch
queue-6.3/kvm-x86-account-fastpath-only-vm-exits-in-vcpu-stats.patch
queue-6.3/kvm-x86-mmu-grab-memslot-for-correct-address-space-in-nx-recovery-worker.patch
