The patch below does not apply to the 5.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 2368048bf5c2ec4b604ac3431564071e89a0bc71 Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Thu, 12 May 2022 22:27:14 +0000
Subject: [PATCH] KVM: x86: Signal #GP, not -EPERM, on bad
WRMSR(MCi_CTL/STATUS)
Return '1', not '-1', when handling an illegal WRMSR to a MCi_CTL or
MCi_STATUS MSR. The behavior of "all zeros' or "all ones" for CTL MSRs
is architectural, as is the "only zeros" behavior for STATUS MSRs. I.e.
the intent is to inject a #GP, not exit to userspace due to an unhandled
emulation case. Returning '-1' gets interpreted as -EPERM up the stack
and effecitvely kills the guest.
Fixes: 890ca9aefa78 ("KVM: Add MCE support")
Fixes: 9ffd986c6e4e ("KVM: X86: #GP when guest attempts to write MCi_STATUS register w/o 0")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220512222716.4112548-2-seanjc@xxxxxxxxxx
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7ce0c6fe166d..891ca973c838 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3239,13 +3239,13 @@ static int set_msr_mce(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
*/
if ((offset & 0x3) == 0 &&
data != 0 && (data | (1 << 10) | 1) != ~(u64)0)
- return -1;
+ return 1;
/* MCi_STATUS */
if (!msr_info->host_initiated &&
(offset & 0x3) == 1 && data != 0) {
if (!can_set_mci_status(vcpu))
- return -1;
+ return 1;
}
vcpu->arch.mce_banks[offset] = data;
