Re: [PATCH v3 2/2] KVM: PPC: Exit guest upon MCE when FWNMI capability is enabled

On Monday 20 June 2016 10:48 AM, Paul Mackerras wrote:

Hi Aravinda,

On Wed, Jan 13, 2016 at 12:38:09PM +0530, Aravinda Prasad wrote:

quoted

Enhance KVM to cause a guest exit with KVM_EXIT_NMI
exit reasons upon a machine check exception (MCE) in
the guest address space if the KVM_CAP_PPC_FWNMI
capability is enabled (instead of delivering 0x200
interrupt to guest). This enables QEMU to build error
log and deliver machine check exception to guest via
guest registered machine check handler.

This approach simplifies the delivering of machine
check exception to guest OS compared to the earlier
approach of KVM directly invoking 0x200 guest interrupt
vector. In the earlier approach QEMU was enhanced to
patch the 0x200 interrupt vector during boot. The
patched code at 0x200 issued a private hcall to pass
the control to QEMU to build the error log.

This design/approach is based on the feedback for the
QEMU patches to handle machine check exception. Details
of earlier approach of handling machine check exception
in QEMU and related discussions can be found at:

https://lists.nongnu.org/archive/html/qemu-devel/2014-11/msg00813.html

Signed-off-by: Aravinda Prasad <redacted>

Are you in the process of doing a new version of this patch with the
requested changes?

Yes, I am working (intermittently) on the new version. But, not able to
finish off and post it. Will complete it and post the new version.

Regards,
Aravinda

Paul.

-- 
Regards,
Aravinda