[Xen-devel] [PATCH XEN v3 1/2] x86/hvm: allow guest to use clflushopt and clwb

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

Pass CPU features CLFLUSHOPT and CLWB into HVM domain so that those two
instructions can be used by guest.

The specification of above two instructions can be found in
https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx> for tools bits
Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
 tools/libxc/xc_cpufeature.h | 3 ++-
 tools/libxc/xc_cpuid_x86.c  | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/libxc/xc_cpufeature.h b/tools/libxc/xc_cpufeature.h
index c3ddc80..5288ac6 100644
--- a/tools/libxc/xc_cpufeature.h
+++ b/tools/libxc/xc_cpufeature.h
@@ -140,6 +140,7 @@
 #define X86_FEATURE_RDSEED      18 /* RDSEED instruction */
 #define X86_FEATURE_ADX         19 /* ADCX, ADOX instructions */
 #define X86_FEATURE_SMAP        20 /* Supervisor Mode Access Protection */
-
+#define X86_FEATURE_CLFLUSHOPT  23 /* CLFLUSHOPT instruction */
+#define X86_FEATURE_CLWB        24 /* CLWB instruction */
 
 #endif /* __LIBXC_CPUFEATURE_H */
diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
index 8882c01..fecfd6c 100644
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -426,7 +426,9 @@ static void xc_cpuid_hvm_policy(xc_interface *xch,
                         bitmaskof(X86_FEATURE_RDSEED)  |
                         bitmaskof(X86_FEATURE_ADX)  |
                         bitmaskof(X86_FEATURE_SMAP) |
-                        bitmaskof(X86_FEATURE_FSGSBASE));
+                        bitmaskof(X86_FEATURE_FSGSBASE) |
+                        bitmaskof(X86_FEATURE_CLWB) |
+                        bitmaskof(X86_FEATURE_CLFLUSHOPT));
         } else
             regs[1] = 0;
         regs[0] = regs[2] = regs[3] = 0;
-- 
2.4.8


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