From f33880c5f7a4e2cad25c22112da073273c6e2cfb Mon Sep 17 00:00:00 2001 From: "Dr. David Alan Gilbert" Date: Wed, 24 Feb 2021 11:30:35 -0500 Subject: [PATCH 2/4] target/i386: add fast short REP MOV support RH-Author: Dr. David Alan Gilbert Message-id: <20210224113037.15599-3-dgilbert@redhat.com> Patchwork-id: 101201 O-Subject: [RHEL-8.4.0 qemu-kvm PATCH 2/4] target/i386: add fast short REP MOV support Bugzilla: 1790620 RH-Acked-by: Cornelia Huck RH-Acked-by: Sergio Lopez Pascual RH-Acked-by: Peter Xu From: Chenyi Qiang 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 Signed-off-by: Chenyi Qiang Message-Id: <20200714084148.26690-2-chenyi.qiang@intel.com> Signed-off-by: Eduardo Habkost (cherry picked from commit 5cb287d2bd578dfe4897458793b4fce35bc4f744) Signed-off-by: Danilo C. L. de Paula --- 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 67dab94aa5..f6a9ed84b3 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1077,7 +1077,7 @@ 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, NULL, NULL, NULL, NULL, NULL /* pconfig */, NULL, diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 8e2e52ed31..f5a4efcec6 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -770,6 +770,8 @@ 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) /* Speculation Control */ -- 2.27.0