[qemu-xen master] target/i386: add fast short REP MOV support

[patchbot@xxxxxxx]

commit 5cb287d2bd578dfe4897458793b4fce35bc4f744
Author:     Chenyi Qiang <chenyi.qiang@xxxxxxxxx>
AuthorDate: Tue Jul 14 16:41:46 2020 +0800
Commit:     Eduardo Habkost <ehabkost@xxxxxxxxxx>
CommitDate: Thu Jul 16 11:05:03 2020 -0400

    target/i386: add fast short REP MOV support
    
    For CPUs support fast short REP MOV[CPUID.(EAX=7,ECX=0):EDX(bit4)], e.g
    Icelake and Tigerlake, expose it to the guest VM.
    
    Reviewed-by: Eduardo Habkost <ehabkost@xxxxxxxxxx>
    Signed-off-by: Chenyi Qiang <chenyi.qiang@xxxxxxxxx>
    Message-Id: <20200714084148.26690-2-chenyi.qiang@xxxxxxxxx>
    Signed-off-by: Eduardo Habkost <ehabkost@xxxxxxxxxx>
---
 target/i386/cpu.c | 2 +-
 target/i386/cpu.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 93b62b2eca..3885826bc4 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -984,7 +984,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .type = CPUID_FEATURE_WORD,
         .feat_names = {
             NULL, NULL, "avx512-4vnniw", "avx512-4fmaps",
-            NULL, NULL, NULL, NULL,
+            "fsrm", NULL, NULL, NULL,
             "avx512-vp2intersect", NULL, "md-clear", NULL,
             NULL, NULL, "serialize", NULL,
             "tsx-ldtrk", NULL, NULL /* pconfig */, NULL,
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 37fffa5cac..e1a5c174dc 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -775,6 +775,8 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
 #define CPUID_7_0_EDX_AVX512_4VNNIW     (1U << 2)
 /* AVX512 Multiply Accumulation Single Precision */
 #define CPUID_7_0_EDX_AVX512_4FMAPS     (1U << 3)
+/* Fast Short Rep Mov */
+#define CPUID_7_0_EDX_FSRM              (1U << 4)
 /* AVX512 Vector Pair Intersection to a Pair of Mask Registers */
 #define CPUID_7_0_EDX_AVX512_VP2INTERSECT (1U << 8)
 /* SERIALIZE instruction */
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#master