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Subject[PATCH RFC 7/7] kvm: x86: AMX XCR0 support for guest
Date
Two XCR0 bits are defined for AMX to support XSAVE mechanism.
Bit 17 is for tilecfg and bit 18 is for tiledata.

Signed-off-by: Jing Liu <jing2.liu@linux.intel.com>
---
arch/x86/kvm/x86.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bfbde877221e..f1c5893dee18 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -189,7 +189,7 @@ static struct kvm_user_return_msrs __percpu *user_return_msrs;
#define KVM_SUPPORTED_XCR0 (XFEATURE_MASK_FP | XFEATURE_MASK_SSE \
| XFEATURE_MASK_YMM | XFEATURE_MASK_BNDREGS \
| XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512 \
- | XFEATURE_MASK_PKRU)
+ | XFEATURE_MASK_PKRU | XFEATURE_MASK_XTILE)

u64 __read_mostly host_efer;
EXPORT_SYMBOL_GPL(host_efer);
@@ -946,6 +946,12 @@ static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512)
return 1;
}
+
+ if (xcr0 & XFEATURE_MASK_XTILE) {
+ if ((xcr0 & XFEATURE_MASK_XTILE) != XFEATURE_MASK_XTILE)
+ return 1;
+ }
+
vcpu->arch.xcr0 = xcr0;

if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND)
--
2.18.4
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