This is a note to let you know that I've just added the patch titled
KVM: set_msr_mce: Permit guests to ignore single-bit ECC errors
to the 5.15-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-set_msr_mce-permit-guests-to-ignore-single-bit-e.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 16198eef162b1958bc149d489bec46899d1da19b
Author: Lev Kujawski <lkujaw@xxxxxxxxxxxxxx>
Date: Sat May 21 08:15:11 2022 +0000
KVM: set_msr_mce: Permit guests to ignore single-bit ECC errors
[ Upstream commit 0471a7bd1bca2a47a5f378f2222c5cf39ce94152 ]
Certain guest operating systems (e.g., UNIXWARE) clear bit 0 of
MC1_CTL to ignore single-bit ECC data errors. Single-bit ECC data
errors are always correctable and thus are safe to ignore because they
are informational in nature rather than signaling a loss of data
integrity.
Prior to this patch, these guests would crash upon writing MC1_CTL,
with resultant error messages like the following:
error: kvm run failed Operation not permitted
EAX=fffffffe EBX=fffffffe ECX=00000404 EDX=ffffffff
ESI=ffffffff EDI=00000001 EBP=fffdaba4 ESP=fffdab20
EIP=c01333a5 EFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0108 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
CS =0100 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0108 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
DS =0108 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
FS =0000 00000000 ffffffff 00c00000
GS =0000 00000000 ffffffff 00c00000
LDT=0118 c1026390 00000047 00008200 DPL=0 LDT
TR =0110 ffff5af0 00000067 00008b00 DPL=0 TSS32-busy
GDT= ffff5020 000002cf
IDT= ffff52f0 000007ff
CR0=8001003b CR2=00000000 CR3=0100a000 CR4=00000230
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000
DR6=ffff0ff0 DR7=00000400
EFER=0000000000000000
Code=08 89 01 89 51 04 c3 8b 4c 24 08 8b 01 8b 51 04 8b 4c 24 04 <0f>
30 c3 f7 05 a4 6d ff ff 10 00 00 00 74 03 0f 31 c3 33 c0 33 d2 c3 8d
74 26 00 0f 31 c3
Signed-off-by: Lev Kujawski <lkujaw@xxxxxxxxxxxxxx>
Message-Id: <20220521081511.187388-1-lkujaw@xxxxxxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 24875dc87b13..dac2892d095c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3102,10 +3102,13 @@ static int set_msr_mce(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
/* only 0 or all 1s can be written to IA32_MCi_CTL
* some Linux kernels though clear bit 10 in bank 4 to
* workaround a BIOS/GART TBL issue on AMD K8s, ignore
- * this to avoid an uncatched #GP in the guest
+ * this to avoid an uncatched #GP in the guest.
+ *
+ * UNIXWARE clears bit 0 of MC1_CTL to ignore
+ * correctable, single-bit ECC data errors.
*/
if ((offset & 0x3) == 0 &&
- data != 0 && (data | (1 << 10)) != ~(u64)0)
+ data != 0 && (data | (1 << 10) | 1) != ~(u64)0)
return -1;
/* MCi_STATUS */
