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    KVM: set_msr_mce: Permit guests to ignore single-bit ECC errors · e04324bf
    Lev Kujawski 提交于
    stable inclusion
    from stable-v5.10.137
    commit f5385a590df78d7649876a2087646090e867e6eb
    category: bugfix
    bugzilla: https://gitee.com/openeuler/kernel/issues/I60PLB
    
    Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f5385a590df78d7649876a2087646090e867e6eb
    
    --------------------------------
    
    [ Upstream commit 0471a7bd ]
    
    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: NLev Kujawski <lkujaw@member.fsf.org>
    Message-Id: <20220521081511.187388-1-lkujaw@member.fsf.org>
    Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: NSasha Levin <sashal@kernel.org>
    Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
    Reviewed-by: NWei Li <liwei391@huawei.com>
    e04324bf
x86.c 301.7 KB