[xen staging] x86/cpuid: expose MCDT_NO to guests

[patchbot@xxxxxxx]

commit ae49ee66cfda4ab6b8ef85cae5d59f8f020615c0
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Wed May 18 11:21:49 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
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@xxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 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 */
 
--
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