[Xen-devel] [PATCH][SVM] Fix 32bit Windows guest VMs save/restore

[Wei Huang <wei.huang2@xxxxxxx>]

The attached patch fixes the save/restore issue seen with 32bit Windows
guest VMs. The root cause is that current Xen doesn't intercept
SYSENTER-related MSRs for 32bit guest VMs. As a result, the
guest_sysenter_xxx fields contain incorrect values and shouldn't be used
for save/restore. This patch checks the LMA bit of EFER register in the
save/restore code path.

Please apply it to both Xen-4.0 and Xen-unstable trees.

Reported-by: James Harper <james.harper@xxxxxxxxxxxxxxxx>
Signed-off-by: Wei Huang <wei.huang2@xxxxxxx>
Acked-by: Christoph Egger <christoph.egger@xxxxxxx>

Attachment: amd_fix_sysenter_msr.txt
Description: amd_fix_sysenter_msr.txt

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