[5/8] target/i386: Add XSAVES support for Arch LBR

Commit Message

Yang, Weijiang Feb. 15, 2022, 7:52 p.m. UTC

Define Arch LBR bit in XSS and save/restore structure
for XSAVE area size calculation.

Signed-off-by: Yang Weijiang <[e-mail]>
---
 target/i386/cpu.c |  6 +++++-
 target/i386/cpu.h | 23 +++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

Patch

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 496e906233..e505c926b2 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1414,7 +1414,7 @@  static const X86RegisterInfo32 x86_reg_info_32[CPU_NB_REGS32] = {
 #undef REGISTER
 
 /* CPUID feature bits available in XSS */
-#define CPUID_XSTATE_XSS_MASK    (0)
+#define CPUID_XSTATE_XSS_MASK    (XSTATE_ARCH_LBR_MASK)
 
 ExtSaveArea x86_ext_save_areas[XSAVE_STATE_AREA_COUNT] = {
     [XSTATE_FP_BIT] = {
@@ -1448,6 +1448,10 @@  ExtSaveArea x86_ext_save_areas[XSAVE_STATE_AREA_COUNT] = {
     [XSTATE_PKRU_BIT] =
           { .feature = FEAT_7_0_ECX, .bits = CPUID_7_0_ECX_PKU,
             .size = sizeof(XSavePKRU) },
+    [XSTATE_ARCH_LBR_BIT] = {
+            .feature = FEAT_7_0_EDX, .bits = CPUID_7_0_EDX_ARCH_LBR,
+            .offset = 0 /*supervisor mode component, offset = 0 */,
+            .size = sizeof(XSavesArchLBR) },
     [XSTATE_XTILE_CFG_BIT] = {
         .feature = FEAT_7_0_EDX, .bits = CPUID_7_0_EDX_AMX_TILE,
         .size = sizeof(XSaveXTILECFG),
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 1d17196a0b..07b198539b 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -541,6 +541,7 @@  typedef enum X86Seg {
 #define XSTATE_ZMM_Hi256_BIT            6
 #define XSTATE_Hi16_ZMM_BIT             7
 #define XSTATE_PKRU_BIT                 9
+#define XSTATE_ARCH_LBR_BIT             15
 #define XSTATE_XTILE_CFG_BIT            17
 #define XSTATE_XTILE_DATA_BIT           18
 
@@ -553,6 +554,7 @@  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_ARCH_LBR_MASK            (1ULL << XSTATE_ARCH_LBR_BIT)
 #define XSTATE_XTILE_CFG_MASK           (1ULL << XSTATE_XTILE_CFG_BIT)
 #define XSTATE_XTILE_DATA_MASK          (1ULL << XSTATE_XTILE_DATA_BIT)
 #define XFEATURE_XTILE_MASK             (XSTATE_XTILE_CFG_MASK \
@@ -867,6 +869,8 @@  typedef uint64_t FeatureWordArray[FEATURE_WORDS];
 #define CPUID_7_0_EDX_SERIALIZE         (1U << 14)
 /* TSX Suspend Load Address Tracking instruction */
 #define CPUID_7_0_EDX_TSX_LDTRK         (1U << 16)
+/* Architectural LBRs */
+#define CPUID_7_0_EDX_ARCH_LBR          (1U << 19)
 /* AVX512_FP16 instruction */
 #define CPUID_7_0_EDX_AVX512_FP16       (1U << 23)
 /* AMX tile (two-dimensional register) */
@@ -1386,6 +1390,24 @@  typedef struct XSaveXTILEDATA {
     uint8_t xtiledata[8][1024];
 } XSaveXTILEDATA;
 
+typedef struct {
+       uint64_t from;
+       uint64_t to;
+       uint64_t info;
+} LBR_ENTRY;
+
+#define ARCH_LBR_NR_ENTRIES            32
+
+/* Ext. save area 19: Supervisor mode Arch LBR state */
+typedef struct XSavesArchLBR {
+    uint64_t lbr_ctl;
+    uint64_t lbr_depth;
+    uint64_t ler_from;
+    uint64_t ler_to;
+    uint64_t ler_info;
+    LBR_ENTRY lbr_records[ARCH_LBR_NR_ENTRIES];
+} XSavesArchLBR;
+
 QEMU_BUILD_BUG_ON(sizeof(XSaveAVX) != 0x100);
 QEMU_BUILD_BUG_ON(sizeof(XSaveBNDREG) != 0x40);
 QEMU_BUILD_BUG_ON(sizeof(XSaveBNDCSR) != 0x40);
@@ -1395,6 +1417,7 @@  QEMU_BUILD_BUG_ON(sizeof(XSaveHi16_ZMM) != 0x400);
 QEMU_BUILD_BUG_ON(sizeof(XSavePKRU) != 0x8);
 QEMU_BUILD_BUG_ON(sizeof(XSaveXTILECFG) != 0x40);
 QEMU_BUILD_BUG_ON(sizeof(XSaveXTILEDATA) != 0x2000);
+QEMU_BUILD_BUG_ON(sizeof(XSavesArchLBR) != 0x328);
 
 typedef struct ExtSaveArea {
     uint32_t feature, bits;