diff mbox

[XEN,v3,1/2] x86/hvm: allow guest to use clflushopt and clwb

Message ID 1452249987-31776-2-git-send-email-haozhong.zhang@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Haozhong Zhang Jan. 8, 2016, 10:46 a.m. UTC 
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@citrix.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Wei Liu <wei.liu2@citrix.com> for tools bits
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
---
 tools/libxc/xc_cpufeature.h | 3 ++-
 tools/libxc/xc_cpuid_x86.c  | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)
diff mbox

Patch

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;