qemu-kvm/kvm-target-i386-Update-EPYC-Milan-CPU-model-for-Cache-pr.patch

From 18fc3436b689504c353e92a0e010fc3bb6a5a4af Mon Sep 17 00:00:00 2001
From: Babu Moger <babu.moger@amd.com>
Date: Thu, 8 May 2025 14:58:01 -0500
Subject: [PATCH 05/43] target/i386: Update EPYC-Milan CPU model for Cache
 property, RAS, SVM feature bits

RH-Author: John Allen <None>
RH-MergeRequest: 377: Update EPYC Models and Feature Bits
RH-Jira: RHEL-52650
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [3/6] f6f2a437a158296e884da0f4deac28d58d15ffae (johnalle/qemu-kvm-fork)

Found that some of the cache properties are not set correctly for EPYC models.
l1d_cache.no_invd_sharing should not be true.
l1i_cache.no_invd_sharing should not be true.

L2.self_init should be true.
L2.inclusive should be true.

L3.inclusive should not be true.
L3.no_invd_sharing should be true.

Fix these cache properties.

Also add the missing RAS and SVM features bits on AMD EPYC-Milan model.
The SVM feature bits are used in nested guests.

succor          : Software uncorrectable error containment and recovery capability.
overflow-recov  : MCA overflow recovery support.
lbrv            : LBR virtualization
tsc-scale       : MSR based TSC rate control
vmcb-clean      : VMCB clean bits
flushbyasid     : Flush by ASID
pause-filter    : Pause intercept filter
pfthreshold     : PAUSE filter threshold
v-vmsave-vmload : Virtualized VMLOAD and VMSAVE
vgif            : Virtualized GIF

Signed-off-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Maksim Davydov <davydov-max@yandex-team.ru>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/c619c0e09a9d5d496819ed48d69181d65f416891.1746734284.git.babu.moger@amd.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit fc014d9ba5b26b27401e0e88a4e1ef827c68fe64)

JIRA: https://issues.redhat.com/browse/RHEL-52650

Signed-off-by: John Allen <johnalle@redhat.com>
---
 target/i386/cpu.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 403c72ca60..b3052c6c2c 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -2507,6 +2507,60 @@ static const CPUCaches epyc_milan_v2_cache_info = {
     },
 };
 
+static const CPUCaches epyc_milan_v3_cache_info = {
+    .l1d_cache = &(CPUCacheInfo) {
+        .type = DATA_CACHE,
+        .level = 1,
+        .size = 32 * KiB,
+        .line_size = 64,
+        .associativity = 8,
+        .partitions = 1,
+        .sets = 64,
+        .lines_per_tag = 1,
+        .self_init = true,
+        .share_level = CPU_TOPOLOGY_LEVEL_CORE,
+    },
+    .l1i_cache = &(CPUCacheInfo) {
+        .type = INSTRUCTION_CACHE,
+        .level = 1,
+        .size = 32 * KiB,
+        .line_size = 64,
+        .associativity = 8,
+        .partitions = 1,
+        .sets = 64,
+        .lines_per_tag = 1,
+        .self_init = true,
+        .share_level = CPU_TOPOLOGY_LEVEL_CORE,
+    },
+    .l2_cache = &(CPUCacheInfo) {
+        .type = UNIFIED_CACHE,
+        .level = 2,
+        .size = 512 * KiB,
+        .line_size = 64,
+        .associativity = 8,
+        .partitions = 1,
+        .sets = 1024,
+        .lines_per_tag = 1,
+        .self_init = true,
+        .inclusive = true,
+        .share_level = CPU_TOPOLOGY_LEVEL_CORE,
+    },
+    .l3_cache = &(CPUCacheInfo) {
+        .type = UNIFIED_CACHE,
+        .level = 3,
+        .size = 32 * MiB,
+        .line_size = 64,
+        .associativity = 16,
+        .partitions = 1,
+        .sets = 32768,
+        .lines_per_tag = 1,
+        .self_init = true,
+        .no_invd_sharing = true,
+        .complex_indexing = false,
+        .share_level = CPU_TOPOLOGY_LEVEL_DIE,
+    },
+};
+
 static const CPUCaches epyc_genoa_cache_info = {
     .l1d_cache = &(CPUCacheInfo) {
         .type = DATA_CACHE,
@@ -5585,6 +5639,25 @@ static const X86CPUDefinition builtin_x86_defs[] = {
                 },
                 .cache_info = &epyc_milan_v2_cache_info
             },
+            {
+                .version = 3,
+                .props = (PropValue[]) {
+                    { "overflow-recov", "on" },
+                    { "succor", "on" },
+                    { "lbrv", "on" },
+                    { "tsc-scale", "on" },
+                    { "vmcb-clean", "on" },
+                    { "flushbyasid", "on" },
+                    { "pause-filter", "on" },
+                    { "pfthreshold", "on" },
+                    { "v-vmsave-vmload", "on" },
+                    { "vgif", "on" },
+                    { "model-id",
+                      "AMD EPYC-Milan-v3 Processor" },
+                    { /* end of list */ }
+                },
+                .cache_info = &epyc_milan_v3_cache_info
+            },
             { /* end of list */ }
         }
     },
-- 
2.39.3