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Subject[Qemu-devel][PATCH 1/4] Add CET xsaves/xrstors related macros and structures.
Date
CET protection in user mode and kernel mode relies on
specific MSRs, these MSRs' contents are automatically
saved/restored by xsaves/xrstors instructions.

Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
target/i386/cpu.h | 36 +++++++++++++++++++++++++++++++++++-
1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 9c52d0cbeb..f3f724d8e6 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -469,6 +469,9 @@ typedef enum X86Seg {
#define XSTATE_ZMM_Hi256_BIT 6
#define XSTATE_Hi16_ZMM_BIT 7
#define XSTATE_PKRU_BIT 9
+#define XSTATE_RESERVED_BIT 10
+#define XSTATE_CET_U_BIT 11
+#define XSTATE_CET_S_BIT 12

#define XSTATE_FP_MASK (1ULL << XSTATE_FP_BIT)
#define XSTATE_SSE_MASK (1ULL << XSTATE_SSE_BIT)
@@ -479,6 +482,19 @@ typedef enum X86Seg {
#define XSTATE_ZMM_Hi256_MASK (1ULL << XSTATE_ZMM_Hi256_BIT)
#define XSTATE_Hi16_ZMM_MASK (1ULL << XSTATE_Hi16_ZMM_BIT)
#define XSTATE_PKRU_MASK (1ULL << XSTATE_PKRU_BIT)
+#define XSTATE_RESERVED_MASK (1ULL << XSTATE_RESERVED_BIT)
+#define XSTATE_CET_U_MASK (1ULL << XSTATE_CET_U_BIT)
+#define XSTATE_CET_S_MASK (1ULL << XSTATE_CET_S_BIT)
+
+/* CPUID feature bits available in XCR0 */
+#define CPUID_XSTATE_USER_MASK (XSTATE_FP_MASK | XSTATE_SSE_MASK \
+ | XSTATE_YMM_MASK | XSTATE_BNDREGS_MASK \
+ | XSTATE_BNDCSR_MASK | XSTATE_OPMASK_MASK \
+ | XSTATE_ZMM_Hi256_MASK \
+ | XSTATE_Hi16_ZMM_MASK | XSTATE_PKRU_MASK)
+
+/* CPUID feature bits available in XSS */
+#define CPUID_XSTATE_KERNEL_MASK (XSTATE_CET_U_MASK | XSTATE_CET_S_MASK)

/* CPUID feature words */
typedef enum FeatureWord {
@@ -503,6 +519,8 @@ typedef enum FeatureWord {
FEAT_XSAVE_COMP_LO, /* CPUID[EAX=0xd,ECX=0].EAX */
FEAT_XSAVE_COMP_HI, /* CPUID[EAX=0xd,ECX=0].EDX */
FEAT_ARCH_CAPABILITIES,
+ FEAT_XSAVE_SV_LO, /* CPUID[EAX=0xd,ECX=1].ECX */
+ FEAT_XSAVE_SV_HI, /* CPUID[EAX=0xd,ECX=1].EDX */
FEATURE_WORDS,
} FeatureWord;

@@ -687,7 +705,7 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
#define CPUID_7_0_ECX_LA57 (1U << 16)
#define CPUID_7_0_ECX_RDPID (1U << 22)
#define CPUID_7_0_ECX_CLDEMOTE (1U << 25) /* CLDEMOTE Instruction */
-
+#define CPUID_7_0_ECX_CET_SHSTK (1U << 7) /* CET SHSTK feature bit */
#define CPUID_7_0_EDX_AVX512_4VNNIW (1U << 2) /* AVX512 Neural Network Instructions */
#define CPUID_7_0_EDX_AVX512_4FMAPS (1U << 3) /* AVX512 Multiply Accumulation Single Precision */
#define CPUID_7_0_EDX_PCONFIG (1U << 18) /* Platform Configuration */
@@ -1021,6 +1039,19 @@ typedef struct XSavePKRU {
uint32_t padding;
} XSavePKRU;

+/* Ext. save area 11: User mode CET state */
+typedef struct XSaveCETU {
+ uint64_t u_cet;
+ uint64_t user_ssp;
+} XSaveCETU;
+
+/* Ext. save area 12: Supervisor mode CET state */
+typedef struct XSaveCETS {
+ uint64_t kernel_ssp;
+ uint64_t pl1_ssp;
+ uint64_t pl2_ssp;
+} XSaveCETS;
+
typedef struct X86XSaveArea {
X86LegacyXSaveArea legacy;
X86XSaveHeader header;
@@ -1039,6 +1070,9 @@ typedef struct X86XSaveArea {
XSaveHi16_ZMM hi16_zmm_state;
/* PKRU State: */
XSavePKRU pkru_state;
+ /* CET State: */
+ XSaveCETU cet_u;
+ XSaveCETS cet_s;
} X86XSaveArea;

QEMU_BUILD_BUG_ON(offsetof(X86XSaveArea, avx_state) != 0x240);
--
2.17.1
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