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KVM: fix XSAVE bit scanning 

When KVM scans the 0xD CPUID leaf for propagating the XSAVE save area
leaves, it assumes that the leaves are contigious and stops at the
first zero one. On AMD hardware there is a gap, though, as LWP uses
leaf 62 to announce it's state save area.
So lets iterate through all 64 possible leaves and simply skip zero
ones to also cover later features.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Andre Przywara 2011-03-30 15:01:45 +02:00 committed by Avi Kivity
parent 0857b9e95c
commit 20800bc940
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kvm/x86.c
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@ -2395,9 +2395,9 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
int i;
entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
for (i = 1; *nent < maxnent; ++i) {
if (entry[i - 1].eax == 0 && i != 2)
break;
for (i = 1; *nent < maxnent && i < 64; ++i) {
if (entry[i].eax == 0)
continue;
do_cpuid_1_ent(&entry[i], function, i);
entry[i].flags |=
KVM_CPUID_FLAG_SIGNIFCANT_INDEX;