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authorJan Beulich <JBeulich@suse.com>2015-01-13 07:40:05 +0000
committerDavid Vrabel <david.vrabel@citrix.com>2015-01-13 09:39:50 +0000
commitf221b04fe07eb56c39935e31bb8e9ddacc00612f (patch)
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parent9a17ad7f3db17db0c6375de96672f16ab1aa51ae (diff)
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x86/xen: properly retrieve NMI reason
Using the native code here can't work properly, as the hypervisor would normally have cleared the two reason bits by the time Dom0 gets to see the NMI (if passed to it at all). There's a shared info field for this, and there's an existing hook to use - just fit the two together. This is particularly relevant so that NMIs intended to be handled by APEI / GHES actually make it to the respective handler. Note that the hook can (and should) be used irrespective of whether being in Dom0, as accessing port 0x61 in a DomU would be even worse, while the shared info field would just hold zero all the time. Note further that hardware NMI handling for PVH doesn't currently work anyway due to missing code in the hypervisor (but it is expected to work the native rather than the PV way). Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
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