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a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=HzLeVaNsDn8A:10 a=M51BFTxLslgA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=0QvD_Kcuy4tFh8f5MFUA:9 cc=ntf awl=host:13697 X-Proofpoint-GUID: tfb5chYdmixSjCi92Ni_fvW3gB3OC6Ew X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjEzMDE0MiBTYWx0ZWRfXzbhj/d55kZiv 5Cw24MvhAMBLLAnA1zgYEh8MJg8bbQnqEMuGGVBQkd2CLZ9vdK9BYfibURJhzpLMMw1/R8XMK2T Kc9TZ6z6jjVYmBbBd+jbtQb87Cc573S05zV63puu4Dwq7Cn1YZpvVNkY3/7ob9PC49SyGvtX6pm iSKrOpaRGl6twRClk7+/qhdPmJtKct04qwTDLrGEwYckqQQuXs2ApQ0QHLO7bFN4ZbUdwJga2OQ LSoqRQjvbw/q7PuND+oIpVp+1Lktt4c5OFL1tHhh0gDvw1wivCqAbLmHV6N5RhhuKWds6LyAgVV YJus4srTAjOUkgpsEOTeMLiU5t69iRENQZXT+q2esJkgEek7gFvos7gpFYHhvkFZNf28LS8/TvC UDXE6z2XRcajluCQbaEFyJI8Qy1HUyuucaeFzP5/CHXp9Z6w3NDb3K+ULG7Q22PI3ILyjXoT2Kx cqandHDXV4euC7Rcf1EYDyAYabiH3fQc93VF78Bk= From: William Roche After the integration of the following commit: 7cb735d7c0cb x86/mce: Unify AMD DFR handler with MCA Polling AMD Qemu VM started to crash when dealing with deferred memory error injection with a stack trace like: mce: MSR access error: WRMSR to 0xc0002098 (tried to write 0x0000000000000000) at rIP: 0xffffffff8229894d (mce_wrmsrq+0x1d/0x60) amd_clear_bank+0x6e/0x70 machine_check_poll+0x228/0x2e0 ? __pfx_mce_timer_fn+0x10/0x10 mce_timer_fn+0xb1/0x130 ? __pfx_mce_timer_fn+0x10/0x10 call_timer_fn+0x26/0x120 __run_timers+0x202/0x290 run_timer_softirq+0x49/0x100 handle_softirqs+0xeb/0x2c0 __irq_exit_rcu+0xda/0x100 sysvec_apic_timer_interrupt+0x71/0x90 [...] Kernel panic - not syncing: MCA architectural violation! See the discussion at: https://lore.kernel.org/all/48d8e1c8-1eb9-49cc-8de8-78077f29c203@oracle.com/ We identified a problem with SMCA specific registers access from non-SMCA platforms like a Qemu/KVM machine. This patch is checkpatch.pl clean. Unit test of memory error injection works fine with it. The commit introducing this error has been integrated into the stable tree too, that's the reason why I added the Cc: stable... entry. Thanks in advance for your feedback. William Roche (1): x86/mce: AMD deferred error handling crashes Qemu VMs arch/x86/kernel/cpu/mce/amd.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) -- 2.47.3