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SUSE:SLE-12-SP4:Update
xen.26348
xsa297-1.patch
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File xsa297-1.patch of Package xen.26348
x86/spec-ctrl: CPUID/MSR definitions for Microarchitectural Data Sampling The MD_CLEAR feature can be automatically offered to guests. No infrastructure is needed in Xen to support the guest making use of it. This is part of XSA-297, CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2019-11091. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> --- a/docs/misc/xen-command-line.markdown +++ b/docs/misc/xen-command-line.markdown @@ -442,7 +442,7 @@ accounting for hardware capabilities as Currently accepted: -The Speculation Control hardware features `ibrsb`, `stibp`, `ibpb`, +The Speculation Control hardware features `md-clear`, `ibrsb`, `stibp`, `ibpb`, `l1d-flush` and `ssbd` are used by default if available and applicable. They can be ignored, e.g. `no-ibrsb`, at which point Xen won't use them itself, and won't offer them to guests. --- a/tools/libxl/libxl_cpuid.c +++ b/tools/libxl/libxl_cpuid.c @@ -158,6 +158,7 @@ int libxl_cpuid_parse_config(libxl_cpuid {"de", 0x00000001, NA, CPUID_REG_EDX, 2, 1}, {"vme", 0x00000001, NA, CPUID_REG_EDX, 1, 1}, {"fpu", 0x00000001, NA, CPUID_REG_EDX, 0, 1}, + {"md-clear", 0x00000007, 0, CPUID_REG_EDX, 10, 1}, {"ibrsb", 0x00000007, 0, CPUID_REG_EDX, 26, 1}, {"stibp", 0x00000007, 0, CPUID_REG_EDX, 27, 1}, {"l1d-flush", 0x00000007, 0, CPUID_REG_EDX, 28, 1}, --- a/tools/misc/xen-cpuid.c +++ b/tools/misc/xen-cpuid.c @@ -149,8 +149,9 @@ static const char *str_e8b[32] = static const char *str_7d0[32] = { - [0 ... 11] = "REZ", + [0 ... 9] = "REZ", + [10] = "md-clear", [11] = "REZ", [12] = "REZ", [13] = "tsx-force-abort", [14 ... 25] = "REZ", --- a/xen/arch/x86/cpuid.c +++ b/xen/arch/x86/cpuid.c @@ -27,7 +27,12 @@ static int __init parse_xen_cpuid(const if ( !ss ) ss = strchr(s, '\0'); - if ( (val = parse_boolean("ibpb", s, ss)) >= 0 ) + if ( (val = parse_boolean("md-clear", s, ss)) >= 0 ) + { + if ( !val ) + setup_clear_cpu_cap(X86_FEATURE_MD_CLEAR); + } + else if ( (val = parse_boolean("ibpb", s, ss)) >= 0 ) { if ( !val ) setup_clear_cpu_cap(X86_FEATURE_IBPB); --- a/xen/arch/x86/spec_ctrl.c +++ b/xen/arch/x86/spec_ctrl.c @@ -329,17 +329,19 @@ static void __init print_details(enum in printk("Speculative mitigation facilities:\n"); /* Hardware features which pertain to speculative mitigations. */ - printk(" Hardware features:%s%s%s%s%s%s%s%s%s%s\n", + printk(" Hardware features:%s%s%s%s%s%s%s%s%s%s%s%s\n", (_7d0 & cpufeat_mask(X86_FEATURE_IBRSB)) ? " IBRS/IBPB" : "", (_7d0 & cpufeat_mask(X86_FEATURE_STIBP)) ? " STIBP" : "", (_7d0 & cpufeat_mask(X86_FEATURE_L1D_FLUSH)) ? " L1D_FLUSH" : "", (_7d0 & cpufeat_mask(X86_FEATURE_SSBD)) ? " SSBD" : "", + (_7d0 & cpufeat_mask(X86_FEATURE_MD_CLEAR)) ? " MD_CLEAR" : "", (e8b & cpufeat_mask(X86_FEATURE_IBPB)) ? " IBPB" : "", (caps & ARCH_CAPABILITIES_IBRS_ALL) ? " IBRS_ALL" : "", (caps & ARCH_CAPABILITIES_RDCL_NO) ? " RDCL_NO" : "", (caps & ARCH_CAPS_RSBA) ? " RSBA" : "", (caps & ARCH_CAPS_SKIP_L1DFL) ? " SKIP_L1DFL": "", - (caps & ARCH_CAPS_SSB_NO) ? " SSB_NO" : ""); + (caps & ARCH_CAPS_SSB_NO) ? " SSB_NO" : "", + (caps & ARCH_CAPS_MDS_NO) ? " MDS_NO" : ""); /* Compiled-in support which pertains to mitigations. */ if ( IS_ENABLED(CONFIG_INDIRECT_THUNK) || IS_ENABLED(CONFIG_SHADOW_PAGING) ) @@ -376,19 +378,23 @@ static void __init print_details(enum in * Alternatives blocks for protecting against and/or virtualising * mitigation support for guests. */ - printk(" Support for VMs: PV:%s%s%s%s, HVM:%s%s%s%s\n", + printk(" Support for VMs: PV:%s%s%s%s%s, HVM:%s%s%s%s%s\n", (boot_cpu_has(X86_FEATURE_SC_MSR_PV) || boot_cpu_has(X86_FEATURE_SC_RSB_PV) || + boot_cpu_has(X86_FEATURE_MD_CLEAR) || opt_eager_fpu) ? "" : " None", boot_cpu_has(X86_FEATURE_SC_MSR_PV) ? " MSR_SPEC_CTRL" : "", boot_cpu_has(X86_FEATURE_SC_RSB_PV) ? " RSB" : "", opt_eager_fpu ? " EAGER_FPU" : "", + boot_cpu_has(X86_FEATURE_MD_CLEAR) ? " MD_CLEAR" : "", (boot_cpu_has(X86_FEATURE_SC_MSR_HVM) || boot_cpu_has(X86_FEATURE_SC_RSB_HVM) || + boot_cpu_has(X86_FEATURE_MD_CLEAR) || opt_eager_fpu) ? "" : " None", boot_cpu_has(X86_FEATURE_SC_MSR_HVM) ? " MSR_SPEC_CTRL" : "", boot_cpu_has(X86_FEATURE_SC_RSB_HVM) ? " RSB" : "", - opt_eager_fpu ? " EAGER_FPU" : ""); + opt_eager_fpu ? " EAGER_FPU" : "", + boot_cpu_has(X86_FEATURE_MD_CLEAR) ? " MD_CLEAR" : ""); printk(" XPTI (64-bit PV only): Dom0 %s, DomU %s\n", opt_xpti_hwdom ? "enabled" : "disabled", --- a/xen/include/asm-x86/msr-index.h +++ b/xen/include/asm-x86/msr-index.h @@ -50,6 +50,7 @@ #define ARCH_CAPS_RSBA (_AC(1, ULL) << 2) #define ARCH_CAPS_SKIP_L1DFL (_AC(1, ULL) << 3) #define ARCH_CAPS_SSB_NO (_AC(1, ULL) << 4) +#define ARCH_CAPS_MDS_NO (_AC(1, ULL) << 5) #define MSR_FLUSH_CMD 0x0000010b #define FLUSH_CMD_L1D (_AC(1, ULL) << 0) --- a/xen/include/public/arch-x86/cpufeatureset.h +++ b/xen/include/public/arch-x86/cpufeatureset.h @@ -227,6 +227,7 @@ XEN_CPUFEATURE(CLZERO, 8*32+ 0) / XEN_CPUFEATURE(IBPB, 8*32+12) /*A IBPB support only (no IBRS, used by AMD) */ /* Intel-defined CPU features, CPUID level 0x00000007:0.edx, word 9 */ +XEN_CPUFEATURE(MD_CLEAR, 9*32+10) /*A VERW clears microarchitectural buffers */ XEN_CPUFEATURE(TSX_FORCE_ABORT, 9*32+13) /* MSR_TSX_FORCE_ABORT.RTM_ABORT */ XEN_CPUFEATURE(IBRSB, 9*32+26) /*A IBRS and IBPB support (used by Intel) */ XEN_CPUFEATURE(STIBP, 9*32+27) /*A! STIBP */
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