[Xen-devel] [PATCH 4/6] libxc: expose xsaves/xgetbv/xsavec to hvm guest

[Shuai Ruan <shuai.ruan@xxxxxxxxx>]

This patch exposes xsaves/xgetbv/xsavec to hvm guest.

Signed-off-by: Shuai Ruan <shuai.ruan@xxxxxxxxx>
---
 tools/libxc/xc_cpuid_x86.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
index c97f91a..0ed8b68 100644
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -211,6 +211,9 @@ static void intel_xc_cpuid_policy(
 }
 
 #define XSAVEOPT        (1 << 0)
+#define XSAVEC          (1 << 1)
+#define XGETBV          (1 << 2)
+#define XSAVES          (1 << 3)
 /* Configure extended state enumeration leaves (0x0000000D for xsave) */
 static void xc_cpuid_config_xsave(
     xc_interface *xch, domid_t domid, uint64_t xfeature_mask,
@@ -247,8 +250,7 @@ static void xc_cpuid_config_xsave(
         regs[1] = 512 + 64; /* FP/SSE + XSAVE.HEADER */
         break;
     case 1: /* leaf 1 */
-        regs[0] &= XSAVEOPT;
-        regs[1] = regs[2] = regs[3] = 0;
+        regs[0] &= (XSAVEOPT | XSAVEC | XGETBV | XSAVES);
         break;
     case 2 ... 63: /* sub-leaves */
         if ( !(xfeature_mask & (1ULL << input[1])) )
@@ -256,8 +258,6 @@ static void xc_cpuid_config_xsave(
             regs[0] = regs[1] = regs[2] = regs[3] = 0;
             break;
         }
-        /* Don't touch EAX, EBX. Also cleanup ECX and EDX */
-        regs[2] = regs[3] = 0;
         break;
     }
 }
-- 
1.9.1


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