[Xen-changelog] [xen master] x86/hvm: allow guest to use clflushopt and clwb

[patchbot@xxxxxxx]

commit 3cb82a561382466208db50d41d6401e2cc4819dd
Author:     Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
AuthorDate: Tue Jan 12 11:28:58 2016 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jan 12 11:28:58 2016 +0100

    x86/hvm: allow guest to use clflushopt and clwb
    
    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
    
    Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx> for tools bits
---
 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;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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