Commit 20800bc9 authored Mar 30, 2011 by Andre Przywara Committed by Avi Kivity Apr 06, 2011

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>

parent 0857b9e9

arch/x86/kvm/x86.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -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;

Admin message