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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen stable-4.9] x86/spec-ctrl: CPUID/MSR definitions for Special Register Buffer Data Sampling
commit 04af886e1bc87bb321339417c5588d12f506003c
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Wed Jan 8 19:47:46 2020 +0000
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Jun 9 17:46:49 2020 +0100
x86/spec-ctrl: CPUID/MSR definitions for Special Register Buffer Data
Sampling
This is part of XSA-320 / CVE-2020-0543
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Wei Liu <wl@xxxxxxx>
(cherry picked from commit caab85ab58c0cdf74ab070a5de5c4df89f509ff3)
---
docs/misc/xen-command-line.markdown | 8 ++++----
tools/libxl/libxl_cpuid.c | 1 +
tools/misc/xen-cpuid.c | 3 ++-
xen/arch/x86/cpuid.c | 5 +++++
xen/arch/x86/hvm/hvm.c | 2 ++
xen/arch/x86/spec_ctrl.c | 3 ++-
xen/arch/x86/traps.c | 2 ++
xen/include/asm-x86/msr-index.h | 3 +++
xen/include/public/arch-x86/cpufeatureset.h | 1 +
9 files changed, 22 insertions(+), 6 deletions(-)
diff --git a/docs/misc/xen-command-line.markdown
b/docs/misc/xen-command-line.markdown
index 80048d4230..177decaece 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -456,10 +456,10 @@ accounting for hardware capabilities as enumerated via
CPUID.
Currently accepted:
-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.
+The Speculation Control hardware features `srbds-ctrl`, `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.
### cpuid\_mask\_cpu (AMD only)
> `= fam_0f_rev_c | fam_0f_rev_d | fam_0f_rev_e | fam_0f_rev_f | fam_0f_rev_g
> | fam_10_rev_b | fam_10_rev_c | fam_11_rev_b`
diff --git a/tools/libxl/libxl_cpuid.c b/tools/libxl/libxl_cpuid.c
index 20d060251a..5a2c67fcac 100644
--- a/tools/libxl/libxl_cpuid.c
+++ b/tools/libxl/libxl_cpuid.c
@@ -158,6 +158,7 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list
*cpuid, const char* str)
{"de", 0x00000001, NA, CPUID_REG_EDX, 2, 1},
{"vme", 0x00000001, NA, CPUID_REG_EDX, 1, 1},
{"fpu", 0x00000001, NA, CPUID_REG_EDX, 0, 1},
+ {"srbds-ctrl", 0x00000007, 0, CPUID_REG_EDX, 9, 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},
diff --git a/tools/misc/xen-cpuid.c b/tools/misc/xen-cpuid.c
index 72c67d0e77..b853656404 100644
--- a/tools/misc/xen-cpuid.c
+++ b/tools/misc/xen-cpuid.c
@@ -157,8 +157,9 @@ static const char *str_7d0[32] =
[ 2] = "avx512_4vnniw", [ 3] = "avx512_4fmaps",
- [4 ... 9] = "REZ",
+ [4 ... 7] = "REZ",
+ [ 8] = "REZ", [ 9] = "srbds-ctrl",
[10] = "md-clear", [11] = "REZ",
[12] = "REZ", [13] = "tsx-force-abort",
diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index 9aaf8b8283..b4988ba527 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -58,6 +58,11 @@ static int __init parse_xen_cpuid(const char *s)
if ( !val )
setup_clear_cpu_cap(X86_FEATURE_SSBD);
}
+ else if ( (val = parse_boolean("srbds-ctrl", s, ss)) >= 0 )
+ {
+ if ( !val )
+ setup_clear_cpu_cap(X86_FEATURE_SRBDS_CTRL);
+ }
else
rc = -EINVAL;
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 2aa9ac06a4..e03c221f54 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -3445,6 +3445,7 @@ int hvm_msr_read_intercept(unsigned int msr, uint64_t
*msr_content)
/* Write-only */
case MSR_TSX_FORCE_ABORT:
case MSR_TSX_CTRL:
+ case MSR_MCU_OPT_CTRL:
/* Not offered to guests. */
goto gp_fault;
@@ -3671,6 +3672,7 @@ int hvm_msr_write_intercept(unsigned int msr, uint64_t
msr_content,
/* Read-only */
case MSR_TSX_FORCE_ABORT:
case MSR_TSX_CTRL:
+ case MSR_MCU_OPT_CTRL:
/* Not offered to guests. */
goto gp_fault;
diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
index f44df6ff43..e212a20127 100644
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -348,12 +348,13 @@ static void __init print_details(enum ind_thunk thunk,
uint64_t caps)
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%s%s%s%s\n",
+ printk(" Hardware features:%s%s%s%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" : "",
+ (_7d0 & cpufeat_mask(X86_FEATURE_SRBDS_CTRL)) ? " SRBDS_CTRL" : "",
(e8b & cpufeat_mask(X86_FEATURE_IBPB)) ? " IBPB" : "",
(caps & ARCH_CAPABILITIES_IBRS_ALL) ? " IBRS_ALL" : "",
(caps & ARCH_CAPABILITIES_RDCL_NO) ? " RDCL_NO" : "",
diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index 9b4bb6a009..6ea582c393 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -2655,6 +2655,7 @@ static int priv_op_read_msr(unsigned int reg, uint64_t
*val,
/* Write-only */
case MSR_TSX_FORCE_ABORT:
case MSR_TSX_CTRL:
+ case MSR_MCU_OPT_CTRL:
/* Not offered to guests. */
break;
@@ -2880,6 +2881,7 @@ static int priv_op_write_msr(unsigned int reg, uint64_t
val,
/* The MSR is read-only. */
case MSR_TSX_FORCE_ABORT:
case MSR_TSX_CTRL:
+ case MSR_MCU_OPT_CTRL:
/* Not offered to guests. */
break;
diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
index 5d636cc250..d77aeb9afa 100644
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -176,6 +176,9 @@
#define MSR_IA32_VMX_TRUE_ENTRY_CTLS 0x490
#define MSR_IA32_VMX_VMFUNC 0x491
+#define MSR_MCU_OPT_CTRL 0x00000123
+#define MCU_OPT_CTRL_RNGDS_MITG_DIS (_AC(1, ULL) << 0)
+
/* K7/K8 MSRs. Not complete. See the architecture manual for a more
complete list. */
#define MSR_K7_EVNTSEL0 0xc0010000
diff --git a/xen/include/public/arch-x86/cpufeatureset.h
b/xen/include/public/arch-x86/cpufeatureset.h
index 000a941e50..c75014f4e3 100644
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -241,6 +241,7 @@ XEN_CPUFEATURE(IBPB, 8*32+12) /*A IBPB support
only (no IBRS, used by
/* Intel-defined CPU features, CPUID level 0x00000007:0.edx, word 9 */
XEN_CPUFEATURE(AVX512_4VNNIW, 9*32+ 2) /*A AVX512 Neural Network Instructions
*/
XEN_CPUFEATURE(AVX512_4FMAPS, 9*32+ 3) /*A AVX512 Multiply Accumulation
Single Precision */
+XEN_CPUFEATURE(SRBDS_CTRL, 9*32+ 9) /* MSR_MCU_OPT_CTRL and
RNGDS_MITG_DIS. */
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) */
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.9
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