diff options
Diffstat (limited to '0049-x86-cpuid-Enumeration-for-BTC_NO.patch')
| -rw-r--r-- | 0049-x86-cpuid-Enumeration-for-BTC_NO.patch | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/0049-x86-cpuid-Enumeration-for-BTC_NO.patch b/0049-x86-cpuid-Enumeration-for-BTC_NO.patch deleted file mode 100644 index 0e5d119..0000000 --- a/0049-x86-cpuid-Enumeration-for-BTC_NO.patch +++ /dev/null @@ -1,106 +0,0 @@ -From 0826c7596d35c887b3b7858137c7ac374d9ef17a Mon Sep 17 00:00:00 2001 -From: Andrew Cooper <andrew.cooper3@citrix.com> -Date: Mon, 16 May 2022 15:48:24 +0100 -Subject: [PATCH 49/51] x86/cpuid: Enumeration for BTC_NO - -BTC_NO indicates that hardware is not succeptable to Branch Type Confusion. - -Zen3 CPUs don't suffer BTC. - -This is part of XSA-407. - -Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> -Reviewed-by: Jan Beulich <jbeulich@suse.com> -(cherry picked from commit 76cb04ad64f3ab9ae785988c40655a71dde9c319) ---- - tools/libs/light/libxl_cpuid.c | 1 + - tools/misc/xen-cpuid.c | 2 +- - xen/arch/x86/cpu/amd.c | 10 ++++++++++ - xen/arch/x86/spec_ctrl.c | 5 +++-- - xen/include/public/arch-x86/cpufeatureset.h | 1 + - 5 files changed, 16 insertions(+), 3 deletions(-) - -diff --git a/tools/libs/light/libxl_cpuid.c b/tools/libs/light/libxl_cpuid.c -index d462f9e421ed..bf6fdee360a9 100644 ---- a/tools/libs/light/libxl_cpuid.c -+++ b/tools/libs/light/libxl_cpuid.c -@@ -288,6 +288,7 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list *cpuid, const char* str) - {"virt-ssbd", 0x80000008, NA, CPUID_REG_EBX, 25, 1}, - {"ssb-no", 0x80000008, NA, CPUID_REG_EBX, 26, 1}, - {"psfd", 0x80000008, NA, CPUID_REG_EBX, 28, 1}, -+ {"btc-no", 0x80000008, NA, CPUID_REG_EBX, 29, 1}, - - {"nc", 0x80000008, NA, CPUID_REG_ECX, 0, 8}, - {"apicidsize", 0x80000008, NA, CPUID_REG_ECX, 12, 4}, -diff --git a/tools/misc/xen-cpuid.c b/tools/misc/xen-cpuid.c -index bc7dcf55757a..fe22f5f5b68b 100644 ---- a/tools/misc/xen-cpuid.c -+++ b/tools/misc/xen-cpuid.c -@@ -158,7 +158,7 @@ static const char *const str_e8b[32] = - /* [22] */ [23] = "ppin", - [24] = "amd-ssbd", [25] = "virt-ssbd", - [26] = "ssb-no", -- [28] = "psfd", -+ [28] = "psfd", [29] = "btc-no", - }; - - static const char *const str_7d0[32] = -diff --git a/xen/arch/x86/cpu/amd.c b/xen/arch/x86/cpu/amd.c -index b3b9a0df5fed..b158e3acb5c7 100644 ---- a/xen/arch/x86/cpu/amd.c -+++ b/xen/arch/x86/cpu/amd.c -@@ -847,6 +847,16 @@ static void init_amd(struct cpuinfo_x86 *c) - warning_add(text); - } - break; -+ -+ case 0x19: -+ /* -+ * Zen3 (Fam19h model < 0x10) parts are not susceptible to -+ * Branch Type Confusion, but predate the allocation of the -+ * BTC_NO bit. Fill it back in if we're not virtualised. -+ */ -+ if (!cpu_has_hypervisor && !cpu_has(c, X86_FEATURE_BTC_NO)) -+ __set_bit(X86_FEATURE_BTC_NO, c->x86_capability); -+ break; - } - - display_cacheinfo(c); -diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c -index f4ae36eae2d0..0f101c057f3e 100644 ---- a/xen/arch/x86/spec_ctrl.c -+++ b/xen/arch/x86/spec_ctrl.c -@@ -388,7 +388,7 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps) - * Hardware read-only information, stating immunity to certain issues, or - * suggestions of which mitigation to use. - */ -- printk(" Hardware hints:%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n", -+ printk(" Hardware hints:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n", - (caps & ARCH_CAPS_RDCL_NO) ? " RDCL_NO" : "", - (caps & ARCH_CAPS_IBRS_ALL) ? " IBRS_ALL" : "", - (caps & ARCH_CAPS_RSBA) ? " RSBA" : "", -@@ -403,7 +403,8 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps) - (e8b & cpufeat_mask(X86_FEATURE_IBRS_ALWAYS)) ? " IBRS_ALWAYS" : "", - (e8b & cpufeat_mask(X86_FEATURE_STIBP_ALWAYS)) ? " STIBP_ALWAYS" : "", - (e8b & cpufeat_mask(X86_FEATURE_IBRS_FAST)) ? " IBRS_FAST" : "", -- (e8b & cpufeat_mask(X86_FEATURE_IBRS_SAME_MODE)) ? " IBRS_SAME_MODE" : ""); -+ (e8b & cpufeat_mask(X86_FEATURE_IBRS_SAME_MODE)) ? " IBRS_SAME_MODE" : "", -+ (e8b & cpufeat_mask(X86_FEATURE_BTC_NO)) ? " BTC_NO" : ""); - - /* Hardware features which need driving to mitigate issues. */ - printk(" Hardware features:%s%s%s%s%s%s%s%s%s%s%s%s\n", -diff --git a/xen/include/public/arch-x86/cpufeatureset.h b/xen/include/public/arch-x86/cpufeatureset.h -index 743b857dcd5c..e7b8167800a2 100644 ---- a/xen/include/public/arch-x86/cpufeatureset.h -+++ b/xen/include/public/arch-x86/cpufeatureset.h -@@ -266,6 +266,7 @@ XEN_CPUFEATURE(AMD_SSBD, 8*32+24) /*S MSR_SPEC_CTRL.SSBD available */ - XEN_CPUFEATURE(VIRT_SSBD, 8*32+25) /* MSR_VIRT_SPEC_CTRL.SSBD */ - XEN_CPUFEATURE(SSB_NO, 8*32+26) /*A Hardware not vulnerable to SSB */ - XEN_CPUFEATURE(PSFD, 8*32+28) /*S MSR_SPEC_CTRL.PSFD */ -+XEN_CPUFEATURE(BTC_NO, 8*32+29) /*A Hardware not vulnerable to Branch Type Confusion */ - - /* Intel-defined CPU features, CPUID level 0x00000007:0.edx, word 9 */ - XEN_CPUFEATURE(AVX512_4VNNIW, 9*32+ 2) /*A AVX512 Neural Network Instructions */ --- -2.35.1 - |