diff options
Diffstat (limited to 'target/i386/cpu.c')
| -rw-r--r-- | target/i386/cpu.c | 107 |
1 files changed, 97 insertions, 10 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index c0fb6b3ad9..b5688cabb4 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -623,13 +623,25 @@ void x86_cpu_vendor_words2str(char *dst, uint32_t vendor1, CPUID_MTRR, CPUID_MCA, CPUID_CLFLUSH (needed for Win64) */ /* missing: CPUID_VME, CPUID_DTS, CPUID_SS, CPUID_HT, CPUID_TM, CPUID_PBE */ + +/* + * Kernel-only features that can be shown to usermode programs even if + * they aren't actually supported by TCG, because qemu-user only runs + * in CPL=3; remove them if they are ever implemented for system emulation. + */ +#if defined CONFIG_USER_ONLY +#define CPUID_EXT_KERNEL_FEATURES (CPUID_EXT_PCID | CPUID_EXT_TSC_DEADLINE_TIMER | \ + CPUID_EXT_X2APIC) +#else +#define CPUID_EXT_KERNEL_FEATURES 0 +#endif #define TCG_EXT_FEATURES (CPUID_EXT_SSE3 | CPUID_EXT_PCLMULQDQ | \ CPUID_EXT_MONITOR | CPUID_EXT_SSSE3 | CPUID_EXT_CX16 | \ CPUID_EXT_SSE41 | CPUID_EXT_SSE42 | CPUID_EXT_POPCNT | \ CPUID_EXT_XSAVE | /* CPUID_EXT_OSXSAVE is dynamic */ \ CPUID_EXT_MOVBE | CPUID_EXT_AES | CPUID_EXT_HYPERVISOR | \ CPUID_EXT_RDRAND | CPUID_EXT_AVX | CPUID_EXT_F16C | \ - CPUID_EXT_FMA) + CPUID_EXT_FMA | CPUID_EXT_KERNEL_FEATURES) /* missing: CPUID_EXT_DTES64, CPUID_EXT_DSCPL, CPUID_EXT_VMX, CPUID_EXT_SMX, CPUID_EXT_EST, CPUID_EXT_TM2, CPUID_EXT_CID, @@ -642,22 +654,66 @@ void x86_cpu_vendor_words2str(char *dst, uint32_t vendor1, #define TCG_EXT2_X86_64_FEATURES 0 #endif +/* + * CPUID_*_KERNEL_FEATURES denotes bits and features that are not usable + * in usermode or by 32-bit programs. Those are added to supported + * TCG features unconditionally in user-mode emulation mode. This may + * indeed seem strange or incorrect, but it works because code running + * under usermode emulation cannot access them. + * + * Even for long mode, qemu-i386 is not running "a userspace program on a + * 32-bit CPU"; it's running "a userspace program with a 32-bit code segment" + * and therefore using the 32-bit ABI; the CPU itself might be 64-bit + * but again the difference is only visible in kernel mode. + */ +#if defined CONFIG_LINUX_USER +#define CPUID_EXT2_KERNEL_FEATURES (CPUID_EXT2_LM | CPUID_EXT2_FFXSR) +#elif defined CONFIG_USER_ONLY +/* FIXME: Long mode not yet supported for i386 bsd-user */ +#define CPUID_EXT2_KERNEL_FEATURES CPUID_EXT2_FFXSR +#else +#define CPUID_EXT2_KERNEL_FEATURES 0 +#endif + #define TCG_EXT2_FEATURES ((TCG_FEATURES & CPUID_EXT2_AMD_ALIASES) | \ CPUID_EXT2_NX | CPUID_EXT2_MMXEXT | CPUID_EXT2_RDTSCP | \ CPUID_EXT2_3DNOW | CPUID_EXT2_3DNOWEXT | CPUID_EXT2_PDPE1GB | \ - CPUID_EXT2_SYSCALL | TCG_EXT2_X86_64_FEATURES) + CPUID_EXT2_SYSCALL | TCG_EXT2_X86_64_FEATURES | \ + CPUID_EXT2_KERNEL_FEATURES) + +#if defined CONFIG_USER_ONLY +#define CPUID_EXT3_KERNEL_FEATURES CPUID_EXT3_OSVW +#else +#define CPUID_EXT3_KERNEL_FEATURES 0 +#endif + #define TCG_EXT3_FEATURES (CPUID_EXT3_LAHF_LM | CPUID_EXT3_SVM | \ CPUID_EXT3_CR8LEG | CPUID_EXT3_ABM | CPUID_EXT3_SSE4A | \ - CPUID_EXT3_3DNOWPREFETCH) + CPUID_EXT3_3DNOWPREFETCH | CPUID_EXT3_KERNEL_FEATURES) + #define TCG_EXT4_FEATURES 0 + +#if defined CONFIG_USER_ONLY +#define CPUID_SVM_KERNEL_FEATURES (CPUID_SVM_NRIPSAVE | CPUID_SVM_VNMI) +#else +#define CPUID_SVM_KERNEL_FEATURES 0 +#endif #define TCG_SVM_FEATURES (CPUID_SVM_NPT | CPUID_SVM_VGIF | \ - CPUID_SVM_SVME_ADDR_CHK) + CPUID_SVM_SVME_ADDR_CHK | CPUID_SVM_KERNEL_FEATURES) + #define TCG_KVM_FEATURES 0 + +#if defined CONFIG_USER_ONLY +#define CPUID_7_0_EBX_KERNEL_FEATURES CPUID_7_0_EBX_INVPCID +#else +#define CPUID_7_0_EBX_KERNEL_FEATURES 0 +#endif #define TCG_7_0_EBX_FEATURES (CPUID_7_0_EBX_SMEP | CPUID_7_0_EBX_SMAP | \ CPUID_7_0_EBX_BMI1 | CPUID_7_0_EBX_BMI2 | CPUID_7_0_EBX_ADX | \ CPUID_7_0_EBX_PCOMMIT | CPUID_7_0_EBX_CLFLUSHOPT | \ CPUID_7_0_EBX_CLWB | CPUID_7_0_EBX_MPX | CPUID_7_0_EBX_FSGSBASE | \ - CPUID_7_0_EBX_ERMS | CPUID_7_0_EBX_AVX2 | CPUID_7_0_EBX_RDSEED) + CPUID_7_0_EBX_ERMS | CPUID_7_0_EBX_AVX2 | CPUID_7_0_EBX_RDSEED | \ + CPUID_7_0_EBX_KERNEL_FEATURES) /* missing: CPUID_7_0_EBX_HLE CPUID_7_0_EBX_INVPCID, CPUID_7_0_EBX_RTM */ @@ -672,7 +728,14 @@ void x86_cpu_vendor_words2str(char *dst, uint32_t vendor1, CPUID_7_0_ECX_LA57 | CPUID_7_0_ECX_PKS | CPUID_7_0_ECX_VAES | \ TCG_7_0_ECX_RDPID) -#define TCG_7_0_EDX_FEATURES CPUID_7_0_EDX_FSRM +#if defined CONFIG_USER_ONLY +#define CPUID_7_0_EDX_KERNEL_FEATURES (CPUID_7_0_EDX_SPEC_CTRL | \ + CPUID_7_0_EDX_ARCH_CAPABILITIES | CPUID_7_0_EDX_SPEC_CTRL_SSBD) +#else +#define CPUID_7_0_EDX_KERNEL_FEATURES 0 +#endif +#define TCG_7_0_EDX_FEATURES (CPUID_7_0_EDX_FSRM | CPUID_7_0_EDX_KERNEL_FEATURES) + #define TCG_7_1_EAX_FEATURES (CPUID_7_1_EAX_FZRM | CPUID_7_1_EAX_FSRS | \ CPUID_7_1_EAX_FSRC) #define TCG_7_1_EDX_FEATURES 0 @@ -686,8 +749,17 @@ void x86_cpu_vendor_words2str(char *dst, uint32_t vendor1, #define TCG_SGX_12_0_EBX_FEATURES 0 #define TCG_SGX_12_1_EAX_FEATURES 0 +#if defined CONFIG_USER_ONLY +#define CPUID_8000_0008_EBX_KERNEL_FEATURES (CPUID_8000_0008_EBX_IBPB | \ + CPUID_8000_0008_EBX_IBRS | CPUID_8000_0008_EBX_STIBP | \ + CPUID_8000_0008_EBX_STIBP_ALWAYS_ON | CPUID_8000_0008_EBX_AMD_SSBD | \ + CPUID_8000_0008_EBX_AMD_PSFD) +#else +#define CPUID_8000_0008_EBX_KERNEL_FEATURES 0 +#endif + #define TCG_8000_0008_EBX (CPUID_8000_0008_EBX_XSAVEERPTR | \ - CPUID_8000_0008_EBX_WBNOINVD) + CPUID_8000_0008_EBX_WBNOINVD | CPUID_8000_0008_EBX_KERNEL_FEATURES) FeatureWordInfo feature_word_info[FEATURE_WORDS] = { [FEAT_1_EDX] = { @@ -1060,15 +1132,22 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = { "rdctl-no", "ibrs-all", "rsba", "skip-l1dfl-vmentry", "ssb-no", "mds-no", "pschange-mc-no", "tsx-ctrl", "taa-no", NULL, NULL, NULL, - NULL, NULL, NULL, NULL, + NULL, "sbdr-ssdp-no", "fbsdp-no", "psdp-no", NULL, "fb-clear", NULL, NULL, NULL, NULL, NULL, NULL, - NULL, NULL, NULL, NULL, + "pbrsb-no", NULL, NULL, NULL, NULL, NULL, NULL, NULL, }, .msr = { .index = MSR_IA32_ARCH_CAPABILITIES, }, + /* + * FEAT_ARCH_CAPABILITIES only affects a read-only MSR, which + * cannot be read from user mode. Therefore, it has no impact + > on any user-mode operation, and warnings about unsupported + * features do not matter. + */ + .tcg_features = ~0U, }, [FEAT_CORE_CAPABILITY] = { .type = MSR_FEATURE_WORD, @@ -5463,7 +5542,15 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w, } #ifndef TARGET_X86_64 if (w == FEAT_8000_0001_EDX) { - r &= ~CPUID_EXT2_LM; + /* + * 32-bit TCG can emulate 64-bit compatibility mode. If there is no + * way for userspace to get out of its 32-bit jail, we can leave + * the LM bit set. + */ + uint32_t unavail = tcg_enabled() + ? CPUID_EXT2_LM & ~CPUID_EXT2_KERNEL_FEATURES + : CPUID_EXT2_LM; + r &= ~unavail; } #endif if (migratable_only) { |