This is the size of the XSAVES area. This completes guest support
for XSAVES (with no support yet for supervisor states, i.e. XSS == 0
always in guests for now).
Suggested-by: Radim Krčmář <rkrc...@redhat.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
arch/x86/kvm/cpuid.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 2c561dba81c0..646e6e830ac3 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -23,7 +23,7 @@
#include "mmu.h"
#include "trace.h"
-static u32 xstate_required_size(u64 xstate_bv)
+static u32 xstate_required_size(u64 xstate_bv, bool compacted)
{
int feature_bit = 0;
u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
@@ -31,9 +31,10 @@ static u32 xstate_required_size(u64 xstate_bv)
xstate_bv &= XSTATE_EXTEND_MASK;
while (xstate_bv) {
if (xstate_bv & 0x1) {
- u32 eax, ebx, ecx, edx;
+ u32 eax, ebx, ecx, edx, offset;
cpuid_count(0xD, feature_bit, &eax, &ebx, &ecx, &edx);
- ret = max(ret, eax + ebx);
+ offset = compacted ? ret : ebx;
+ ret = max(ret, offset + eax);
}
xstate_bv >>= 1;
@@ -87,9 +88,13 @@ int kvm_update_cpuid(struct kvm_vcpu *vcpu)
(best->eax | ((u64)best->edx << 32)) &
kvm_supported_xcr0();
vcpu->arch.guest_xstate_size = best->ebx =
- xstate_required_size(vcpu->arch.xcr0);
+ xstate_required_size(vcpu->arch.xcr0, false);
}
+ best = kvm_find_cpuid_entry(vcpu, 0xD, 1);
+ if (best && (best->eax & F(XSAVES)))
+ best->ebx = xstate_required_size(vcpu->arch.xcr0, true);
+
/*
* The existing code assumes virtual address is 48-bit in the canonical
* address checks; exit if it is ever changed.
--
1.8.3.1
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