Mailing List Archive

commit ae49ee66cfda4ab6b8ef85cae5d59f8f020615c0
Author: Roger Pau Monné <roger.pau@citrix.com>
AuthorDate: Wed May 18 11:21:49 2022 +0200
Commit: Jan Beulich <jbeulich@suse.com>
CommitDate: Wed May 18 11:21:49 2022 +0200

x86/cpuid: expose MCDT_NO to guests

Expose the MCDT_NO CPUID flag to guests if available. The bit signals
that the CPU does not exhibit MCDT behavior, and as such can be
exposed without requiring any additional work.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
tools/libs/light/libxl_cpuid.c | 1 +
tools/misc/xen-cpuid.c | 2 ++
xen/include/public/arch-x86/cpufeatureset.h | 1 +
3 files changed, 4 insertions(+)

diff --git a/tools/libs/light/libxl_cpuid.c b/tools/libs/light/libxl_cpuid.c
index d462f9e421..67ba72dd84 100644
--- a/tools/libs/light/libxl_cpuid.c
+++ b/tools/libs/light/libxl_cpuid.c
@@ -235,6 +235,7 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list *cpuid, const char* str)
{"fsrcs", 0x00000007, 1, CPUID_REG_EAX, 12, 1},

{"intel-psfd", 0x00000007, 2, CPUID_REG_EDX, 0, 1},
+ {"mcdt-no", 0x00000007, 2, CPUID_REG_EDX, 5, 1},

{"lahfsahf", 0x80000001, NA, CPUID_REG_ECX, 0, 1},
{"cmplegacy", 0x80000001, NA, CPUID_REG_ECX, 1, 1},
diff --git a/tools/misc/xen-cpuid.c b/tools/misc/xen-cpuid.c
index 0b1b3333fe..a9e0fb5d17 100644
--- a/tools/misc/xen-cpuid.c
+++ b/tools/misc/xen-cpuid.c
@@ -203,6 +203,8 @@ static const char *const str_7b1[32] =
static const char *const str_7d2[32] =
{
[ 0] = "intel-psfd",
+
+ /* 4 */ [ 5] = "mcdt-no",
};

static const struct {
diff --git a/xen/include/public/arch-x86/cpufeatureset.h b/xen/include/public/arch-x86/cpufeatureset.h
index 9cee4b439e..0c27f5bbaf 100644
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -304,6 +304,7 @@ XEN_CPUFEATURE(INTEL_PPIN, 12*32+ 0) /* Protected Processor Inventory

/* Intel-defined CPU features, CPUID level 0x00000007:2.edx, word 13 */
XEN_CPUFEATURE(INTEL_PSFD, 13*32+ 0) /*A MSR_SPEC_CTRL.PSFD */
+XEN_CPUFEATURE(MCDT_NO, 13*32+ 5) /*A MCDT_NO */

#endif /* XEN_CPUFEATURE */

--
generated by git-patchbot for /home/xen/git/xen.git#master