On 5/10/2020 9:42 AM, Yang Weijiang wrote:
CET SHSTK/IBT MSRs can be saved/restored with XSAVES/XRSTORS, but currently the related feature words are not supported, so add the new entries. XSAVES/RSTORS always use compacted storage format, which means the supervisor states' offsets are always 0, ignore them while calculating stardard format storage size.Signed-off-by: Zhang Yi <yi.z.zh...@linux.intel.com> Signed-off-by: Yang Weijiang <weijiang.y...@intel.com> --- target/i386/cpu.c | 38 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 90ffc5f3b1..3174e05482 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -965,7 +965,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { .type = CPUID_FEATURE_WORD, .feat_names = { NULL, "avx512vbmi", "umip", "pku", - NULL /* ospke */, "waitpkg", "avx512vbmi2", NULL, + NULL /* ospke */, "waitpkg", "avx512vbmi2", "shstk", "gfni", "vaes", "vpclmulqdq", "avx512vnni", "avx512bitalg", NULL, "avx512-vpopcntdq", NULL, "la57", NULL, NULL, NULL, @@ -988,7 +988,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { NULL, NULL, "md-clear", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL /* pconfig */, NULL, - NULL, NULL, NULL, NULL, + "ibt", NULL, NULL, NULL, NULL, NULL, "spec-ctrl", "stibp", NULL, "arch-capabilities", "core-capability", "ssbd", }, @@ -1069,6 +1069,26 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { }, .tcg_features = TCG_XSAVE_FEATURES, }, + /* Below are xsaves feature words */ + [FEAT_XSAVES_LO] = { + .type = CPUID_FEATURE_WORD, + .cpuid = { + .eax = 0xD, + .needs_ecx = true, + .ecx = 1, + .reg = R_ECX, + }, + .migratable_flags = XSTATE_CET_U_MASK,
why exclude XSTATE_CET_S_MASK? Is any reason why it not migratable?
+ }, + [FEAT_XSAVES_HI] = { + .type = CPUID_FEATURE_WORD, + .cpuid = { + .eax = 0xD, + .needs_ecx = true, + .ecx = 1, + .reg = R_EDX + }, + }, [FEAT_6_EAX] = { .type = CPUID_FEATURE_WORD, .feat_names = { @@ -1455,6 +1475,14 @@ static const ExtSaveArea x86_ext_save_areas[] = { { .feature = FEAT_7_0_ECX, .bits = CPUID_7_0_ECX_PKU, .offset = offsetof(X86XSaveArea, pkru_state), .size = sizeof(XSavePKRU) }, + [XSTATE_CET_U_BIT] = { + .feature = FEAT_7_0_ECX, .bits = CPUID_7_0_ECX_CET_SHSTK, + .offset = 0 /*supervisor mode component, offset = 0 */, + .size = sizeof(XSavesCETU) }, + [XSTATE_CET_S_BIT] = { + .feature = FEAT_7_0_ECX, .bits = CPUID_7_0_ECX_CET_SHSTK, + .offset = 0 /*supervisor mode component, offset = 0 */, + .size = sizeof(XSavesCETS) }, };static uint32_t xsave_area_size(uint64_t mask)@@ -1465,6 +1493,9 @@ static uint32_t xsave_area_size(uint64_t mask) for (i = 0; i < ARRAY_SIZE(x86_ext_save_areas); i++) { const ExtSaveArea *esa = &x86_ext_save_areas[i]; if ((mask >> i) & 1) { + if (i >= 2 && !esa->offset) { + continue; + } ret = MAX(ret, esa->offset + esa->size); } } @@ -6008,6 +6039,9 @@ static void x86_cpu_reset(DeviceState *dev) } for (i = 2; i < ARRAY_SIZE(x86_ext_save_areas); i++) { const ExtSaveArea *esa = &x86_ext_save_areas[i]; + if (!esa->offset) { + continue; + } if (env->features[esa->feature] & esa->bits) { xcr0 |= 1ull << i; }
