This is a note to let you know that I've just added the patch titled
KVM: SVM: remove INIT intercept handler
to the 5.13-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-svm-remove-init-intercept-handler.patch
and it can be found in the queue-5.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 896707c212d440a6863ce0a3930c8a609e24497d Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Date: Wed, 7 Jul 2021 15:50:59 +0300
Subject: KVM: SVM: remove INIT intercept handler
From: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
commit 896707c212d440a6863ce0a3930c8a609e24497d upstream.
Kernel never sends real INIT even to CPUs, other than on boot.
Thus INIT interception is an error which should be caught
by a check for an unknown VMexit reason.
On top of that, the current INIT VM exit handler skips
the current instruction which is wrong.
That was added in commit 5ff3a351f687 ("KVM: x86: Move trivial
instruction-based exit handlers to common code").
Fixes: 5ff3a351f687 ("KVM: x86: Move trivial instruction-based exit handlers to common code")
Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Message-Id: <20210707125100.677203-3-mlevitsk@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/svm/svm.c | 1 -
1 file changed, 1 deletion(-)
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3069,7 +3069,6 @@ static int (*const svm_exit_handlers[])(
[SVM_EXIT_INTR] = intr_interception,
[SVM_EXIT_NMI] = nmi_interception,
[SVM_EXIT_SMI] = smi_interception,
- [SVM_EXIT_INIT] = kvm_emulate_as_nop,
[SVM_EXIT_VINTR] = interrupt_window_interception,
[SVM_EXIT_RDPMC] = kvm_emulate_rdpmc,
[SVM_EXIT_CPUID] = kvm_emulate_cpuid,
Patches currently in stable-queue which might be from mlevitsk@xxxxxxxxxx are
queue-5.13/kvm-svm-smi-interception-must-not-skip-the-instruction.patch
queue-5.13/kvm-nsvm-check-the-value-written-to-msr_vm_hsave_pa.patch
queue-5.13/kvm-svm-remove-init-intercept-handler.patch
