From a10f2cff4a418edae4f3040c4bf09e5aad80316a Mon Sep 17 00:00:00 2001

From: "plai@redhat.com" <plai@redhat.com>

Date: Mon, 20 May 2019 20:05:56 +0100

Subject: [PATCH 1/5] x86/cpu: Enable CLDEMOTE(Demote Cache Line) cpu feature

RH-Author: plai@redhat.com

Message-id: <1554409731-21082-1-git-send-email-plai@redhat.com>

Patchwork-id: 85447

O-Subject: [RHEL8.1 qemu-kvm PATCH] x86/cpu: Enable CLDEMOTE(Demote Cache Line) cpu feature

Bugzilla: 1696436

RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>

RH-Acked-by: John Snow <jsnow@redhat.com>

RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>

From: Jingqi Liu <jingqi.liu@intel.com>

BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1696436

Brew:  http://brewweb.devel.redhat.com/brew/taskinfo?taskID=20946375

Branch: rhel-8.1.0

Tested by Intel QA on SNR (simics)

Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>

---

 target/i386/cpu.c | 2 +-

 target/i386/cpu.h | 1 +

 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c

index 8ff6c38..77be7e8 100644

--- a/target/i386/cpu.c

+++ b/target/i386/cpu.c

@@ -1025,7 +1025,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {

             "avx512bitalg", NULL, "avx512-vpopcntdq", NULL,

             "la57", NULL, NULL, NULL,

             NULL, NULL, "rdpid", NULL,

-            NULL, NULL, NULL, NULL,

+            NULL, "cldemote", NULL, NULL,

             NULL, NULL, NULL, NULL,

         },

         .cpuid = {

diff --git a/target/i386/cpu.h b/target/i386/cpu.h

index 3ae0e8c..4f9df6e 100644

--- a/target/i386/cpu.h

+++ b/target/i386/cpu.h

@@ -684,6 +684,7 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];

 #define CPUID_7_0_ECX_AVX512_VPOPCNTDQ (1U << 14) /* POPCNT for vectors of DW/QW */

 #define CPUID_7_0_ECX_LA57     (1U << 16)

 #define CPUID_7_0_ECX_RDPID    (1U << 22)

+#define CPUID_7_0_ECX_CLDEMOTE (1U << 25)  /* CLDEMOTE Instruction */

 #define CPUID_7_0_EDX_AVX512_4VNNIW (1U << 2) /* AVX512 Neural Network Instructions */

 #define CPUID_7_0_EDX_AVX512_4FMAPS (1U << 3) /* AVX512 Multiply Accumulation Single Precision */

-- 

1.8.3.1