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[PATCH v3 4/8] x86: Add XFD faulting bit for state components
From: |
Yang Zhong |
Subject: |
[PATCH v3 4/8] x86: Add XFD faulting bit for state components |
Date: |
Mon, 28 Feb 2022 00:05:11 -0800 |
From: Jing Liu <jing2.liu@intel.com>
Intel introduces XFD faulting mechanism for extended
XSAVE features to dynamically enable the features in
runtime. If CPUID (EAX=0Dh, ECX=n, n>1).ECX[2] is set
as 1, it indicates support for XFD faulting of this
state component.
Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Reviewed-by: David Edmondson <david.edmondson@oracle.com>
---
target/i386/cpu.h | 2 ++
target/i386/cpu.c | 3 ++-
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 9630f4712a..925d0129e2 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -557,8 +557,10 @@ typedef enum X86Seg {
#define XSTATE_DYNAMIC_MASK (XSTATE_XTILE_DATA_MASK)
#define ESA_FEATURE_ALIGN64_BIT 1
+#define ESA_FEATURE_XFD_BIT 2
#define ESA_FEATURE_ALIGN64_MASK (1U << ESA_FEATURE_ALIGN64_BIT)
+#define ESA_FEATURE_XFD_MASK (1U << ESA_FEATURE_XFD_BIT)
/* CPUID feature words */
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 505ee289bc..79e24bb23f 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -5496,7 +5496,8 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
uint32_t count,
const ExtSaveArea *esa = &x86_ext_save_areas[count];
*eax = esa->size;
*ebx = esa->offset;
- *ecx = esa->ecx & ESA_FEATURE_ALIGN64_MASK;
+ *ecx = esa->ecx &
+ (ESA_FEATURE_ALIGN64_MASK | ESA_FEATURE_XFD_MASK);
}
}
break;
- [PATCH v3 0/8] AMX support in Qemu, Yang Zhong, 2022/02/28
- [PATCH v3 2/8] x86: Add AMX XTILECFG and XTILEDATA components, Yang Zhong, 2022/02/28
- [PATCH v3 1/8] x86: Fix the 64-byte boundary enumeration for extended state, Yang Zhong, 2022/02/28
- [PATCH v3 3/8] x86: Grant AMX permission for guest, Yang Zhong, 2022/02/28
- [PATCH v3 4/8] x86: Add XFD faulting bit for state components,
Yang Zhong <=
- [PATCH v3 8/8] linux-header: Sync the linux headers, Yang Zhong, 2022/02/28
- [PATCH v3 5/8] x86: Add AMX CPUIDs enumeration, Yang Zhong, 2022/02/28
- [PATCH v3 7/8] x86: Support XFD and AMX xsave data migration, Yang Zhong, 2022/02/28
- [PATCH v3 6/8] x86: Add support for KVM_CAP_XSAVE2 and AMX state migration, Yang Zhong, 2022/02/28