From: Jing Liu <jing2.liu@linux.intel.com>
To: pbonzini@redhat.com, seanjc@google.com, kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, jing2.liu@intel.com
Subject: [PATCH RFC 7/7] kvm: x86: AMX XCR0 support for guest
Date: Sun, 7 Feb 2021 10:42:56 -0500 [thread overview]
Message-ID: <20210207154256.52850-8-jing2.liu@linux.intel.com> (raw)
In-Reply-To: <20210207154256.52850-1-jing2.liu@linux.intel.com>
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
next prev parent reply other threads:[~2021-02-07 7:00 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-07 15:42 [PATCH RFC 0/7] Introduce support for guest AMX feature Jing Liu
2021-02-07 15:42 ` [PATCH RFC 1/7] kvm: x86: Expose XFD CPUID to guest Jing Liu
2021-05-24 21:34 ` Sean Christopherson
2021-06-07 3:27 ` Liu, Jing2
2021-02-07 15:42 ` [PATCH RFC 2/7] kvm: x86: Introduce XFD MSRs as passthrough " Jing Liu
2021-05-24 21:43 ` Sean Christopherson
2021-05-24 21:57 ` Jim Mattson
2021-06-02 3:12 ` Liu, Jing2
2021-06-23 17:50 ` Dave Hansen
2021-06-28 2:00 ` Liu, Jing2
2021-06-29 17:58 ` Dave Hansen
2021-07-06 7:33 ` Liu, Jing2
2021-02-07 15:42 ` [PATCH RFC 3/7] kvm: x86: XSAVE state and XFD MSRs context switch Jing Liu
2021-02-07 11:49 ` Borislav Petkov
2021-02-08 3:35 ` Liu, Jing2
2021-02-08 10:25 ` Paolo Bonzini
2021-02-08 17:31 ` Sean Christopherson
2021-02-08 17:45 ` Paolo Bonzini
2021-02-08 18:04 ` Sean Christopherson
2021-02-08 18:12 ` Paolo Bonzini
2021-02-08 18:55 ` Konrad Rzeszutek Wilk
2021-02-22 8:51 ` Liu, Jing2
2021-02-22 8:36 ` Liu, Jing2
2021-02-07 15:42 ` [PATCH RFC 4/7] kvm: x86: Add new ioctls for XSAVE extension Jing Liu
2021-05-24 21:50 ` Sean Christopherson
2021-05-26 6:09 ` Liu, Jing2
2021-05-26 14:43 ` Sean Christopherson
2021-06-01 10:24 ` Liu, Jing2
2021-06-07 5:23 ` Liu, Jing2
2021-05-24 22:06 ` Jim Mattson
2021-05-26 6:11 ` Liu, Jing2
2021-02-07 15:42 ` [PATCH RFC 5/7] kvm: x86: Revise CPUID.D.1.EBX for alignment rule Jing Liu
2021-05-24 21:28 ` Sean Christopherson
2021-06-03 4:45 ` Liu, Jing2
2021-02-07 15:42 ` [PATCH RFC 6/7] kvm: x86: Add AMX_TILE, AMX_INT8 and AMX_BF16 support Jing Liu
2021-02-07 15:42 ` Jing Liu [this message]
2021-05-24 21:53 ` [PATCH RFC 7/7] kvm: x86: AMX XCR0 support for guest Sean Christopherson
2021-05-26 7:54 ` Liu, Jing2
2021-05-26 14:54 ` Sean Christopherson
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