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x86: Add XFD faulting bit for state components 

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>
Message-Id: <20220217060434.52460-5-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jing Liu 2022-02-16 22:04:30 -08:00 committed by Paolo Bonzini
parent 19db68ca68
commit 0f17f6b30f
2 changed files with 4 additions and 1 deletions
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3
target/i386/cpu.c
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@ -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;

2
target/i386/cpu.h
View File

@ -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 */