Searched hist:"0 a5e2ec2647737907d267c09dc9a25fab1468865" (Results 1 – 1 of 1) sorted by relevance
/openbmc/linux/arch/s390/kernel/ |
H A D | entry.S | diff 0a5e2ec2647737907d267c09dc9a25fab1468865 Thu Oct 05 01:29:47 CDT 2017 Martin Schwidefsky <schwidefsky@de.ibm.com> s390/kvm: fix detection of guest machine checks
The new detection code for guest machine checks added a check based on %r11 to .Lcleanup_sie to distinguish between normal asynchronous interrupts and machine checks. But the funtion is called from the program check handler as well with an undefined value in %r11.
The effect is that all program exceptions pointing to the SIE instruction will set the CIF_MCCK_GUEST bit. The bit stays set for the CPU until the next machine check comes in which will incorrectly be interpreted as a guest machine check.
The simplest fix is to stop using .Lcleanup_sie in the program check handler and duplicate a few instructions.
Fixes: c929500d7a5a ("s390/nmi: s390: New low level handling for machine check happening in guest") Cc: <stable@vger.kernel.org> # v4.13+ Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
|