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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen stable-4.15] x86/spec-ctrl: Enumerations for Gather Data Sampling
commit abdfd732864a913e8f060f0d8db4b8c0eaec9e1b
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Wed Jan 4 17:32:44 2023 +0000
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Aug 3 19:13:40 2023 +0100
x86/spec-ctrl: Enumerations for Gather Data Sampling
GDS_CTRL is introduced by the August 2023 microcode. GDS_NO is for current
and future processors not susceptible to GDS.
This is part of XSA-435 / CVE-2022-40982
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
(cherry picked from commit 9f585f59d90c8d3a1b21369a852b7d7eee8a29b9)
---
tools/misc/xen-cpuid.c | 3 ++-
xen/arch/x86/spec_ctrl.c | 6 ++++--
xen/include/asm-x86/cpufeature.h | 2 ++
xen/include/asm-x86/msr-index.h | 4 ++++
xen/include/public/arch-x86/cpufeatureset.h | 2 ++
5 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/tools/misc/xen-cpuid.c b/tools/misc/xen-cpuid.c
index b8c1a514a1..860ef07352 100644
--- a/tools/misc/xen-cpuid.c
+++ b/tools/misc/xen-cpuid.c
@@ -223,7 +223,8 @@ static const char *const str_m10Al[32] =
[18] = "fb-clear-ctrl", [19] = "rrsba",
[20] = "bhi-no", [21] = "xapic-status",
/* 22 */ [23] = "ovrclk-status",
- [24] = "pbrsb-no",
+ [24] = "pbrsb-no", [25] = "gds-ctrl",
+ [26] = "gds-no",
};
static const char *const str_m10Ah[32] =
diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
index 47ed952198..19001532d3 100644
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -422,7 +422,7 @@ static void __init print_details(enum ind_thunk thunk)
* 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%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%s%s%s%s%s%s%s\n",
(caps & ARCH_CAPS_RDCL_NO) ? " RDCL_NO"
: "",
(caps & ARCH_CAPS_EIBRS) ? " EIBRS"
: "",
(caps & ARCH_CAPS_RSBA) ? " RSBA"
: "",
@@ -437,6 +437,7 @@ static void __init print_details(enum ind_thunk thunk)
(caps & ARCH_CAPS_PSDP_NO) ? " PSDP_NO"
: "",
(caps & ARCH_CAPS_FB_CLEAR) ? " FB_CLEAR"
: "",
(caps & ARCH_CAPS_PBRSB_NO) ? " PBRSB_NO"
: "",
+ (caps & ARCH_CAPS_GDS_NO) ? " GDS_NO"
: "",
(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"
: "",
@@ -447,7 +448,7 @@ static void __init print_details(enum ind_thunk thunk)
(e21a & cpufeat_mask(X86_FEATURE_SRSO_NO)) ? " SRSO_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",
+ printk(" Hardware features:%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
(e8b & cpufeat_mask(X86_FEATURE_IBPB)) ||
(_7d0 & cpufeat_mask(X86_FEATURE_IBRSB)) ? " IBPB"
: "",
(e8b & cpufeat_mask(X86_FEATURE_IBRS)) ||
@@ -464,6 +465,7 @@ static void __init print_details(enum ind_thunk thunk)
(e8b & cpufeat_mask(X86_FEATURE_VIRT_SSBD)) ? " VIRT_SSBD"
: "",
(caps & ARCH_CAPS_TSX_CTRL) ? " TSX_CTRL"
: "",
(caps & ARCH_CAPS_FB_CLEAR_CTRL) ? "
FB_CLEAR_CTRL" : "",
+ (caps & ARCH_CAPS_GDS_CTRL) ? " GDS_CTRL"
: "",
(e21a & cpufeat_mask(X86_FEATURE_SBPB)) ? " SBPB"
: "");
/* Compiled-in support which pertains to mitigations. */
diff --git a/xen/include/asm-x86/cpufeature.h b/xen/include/asm-x86/cpufeature.h
index 63d31f079a..ecdc7d9b71 100644
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -157,6 +157,8 @@
#define cpu_has_taa_no boot_cpu_has(X86_FEATURE_TAA_NO)
#define cpu_has_fb_clear boot_cpu_has(X86_FEATURE_FB_CLEAR)
#define cpu_has_rrsba boot_cpu_has(X86_FEATURE_RRSBA)
+#define cpu_has_gds_ctrl boot_cpu_has(X86_FEATURE_GDS_CTRL)
+#define cpu_has_gds_no boot_cpu_has(X86_FEATURE_GDS_NO)
/* Synthesized. */
#define cpu_has_arch_perfmon boot_cpu_has(X86_FEATURE_ARCH_PERFMON)
diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
index 2de819efc9..8b3ad575db 100644
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -68,6 +68,8 @@
#define ARCH_CAPS_RRSBA (_AC(1, ULL) << 19)
#define ARCH_CAPS_BHI_NO (_AC(1, ULL) << 20)
#define ARCH_CAPS_PBRSB_NO (_AC(1, ULL) << 24)
+#define ARCH_CAPS_GDS_CTRL (_AC(1, ULL) << 25)
+#define ARCH_CAPS_GDS_NO (_AC(1, ULL) << 26)
#define MSR_FLUSH_CMD 0x0000010b
#define FLUSH_CMD_L1D (_AC(1, ULL) << 0)
@@ -86,6 +88,8 @@
#define MCU_OPT_CTRL_RTM_ALLOW (_AC(1, ULL) << 1)
#define MCU_OPT_CTRL_RTM_LOCKED (_AC(1, ULL) << 2)
#define MCU_OPT_CTRL_FB_CLEAR_DIS (_AC(1, ULL) << 3)
+#define MCU_OPT_CTRL_GDS_MIT_DIS (_AC(1, ULL) << 4)
+#define MCU_OPT_CTRL_GDS_MIT_LOCK (_AC(1, ULL) << 5)
#define MSR_RTIT_OUTPUT_BASE 0x00000560
#define MSR_RTIT_OUTPUT_MASK 0x00000561
diff --git a/xen/include/public/arch-x86/cpufeatureset.h
b/xen/include/public/arch-x86/cpufeatureset.h
index 72a82783d8..e434fc9bae 100644
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -329,6 +329,8 @@ XEN_CPUFEATURE(BHI_NO, 16*32+20) /*A No Branch
History Injection *
XEN_CPUFEATURE(XAPIC_STATUS, 16*32+21) /* MSR_XAPIC_DISABLE_STATUS */
XEN_CPUFEATURE(OVRCLK_STATUS, 16*32+23) /* MSR_OVERCLOCKING_STATUS */
XEN_CPUFEATURE(PBRSB_NO, 16*32+24) /*A No Post-Barrier RSB
predictions */
+XEN_CPUFEATURE(GDS_CTRL, 16*32+25) /*
MCU_OPT_CTRL.GDS_MIT_{DIS,LOCK} */
+XEN_CPUFEATURE(GDS_NO, 16*32+26) /*A No Gather Data Sampling */
/* Intel-defined CPU features, MSR_ARCH_CAPS 0x10a.edx, word 17 */
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.15
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