[Qemu-devel] [PATCH v2] i386: Enable NPT and NRIPSAVE for AMD CPUs

[Vitaly Kuznetsov]

Modern AMD CPUs support NPT and NRIPSAVE features and KVM exposes these
when present. NRIPSAVE apeared somewhere in Opteron_G3 lifetime (e.g.
QuadCore AMD Opteron 2378 has is but QuadCore AMD Opteron HE 2344 doesn't),
NPT was introduced a bit earlier.

Add the FEAT_SVM leaf to Opteron_G4/G5 and EPYC/EPYC-IBPB cpu models.

Signed-off-by: Vitaly Kuznetsov <address@hidden>
---
Changes since v1:
- add npt=off,nrip-save=off to pc_compat_3_1 [Eduardo Habkost]
---
 hw/i386/pc.c      | 8 ++++++++
 target/i386/cpu.c | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 73d688f842..9fc80a9f19 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -114,7 +114,15 @@ GlobalProperty pc_compat_3_1[] = {
     { "intel-iommu", "dma-drain", "off" },
     { "Opteron_G3" "-" TYPE_X86_CPU, "rdtscp", "off" },
     { "Opteron_G4" "-" TYPE_X86_CPU, "rdtscp", "off" },
+    { "Opteron_G4" "-" TYPE_X86_CPU, "npt", "off" },
+    { "Opteron_G4" "-" TYPE_X86_CPU, "nrip-save", "off" },
     { "Opteron_G5" "-" TYPE_X86_CPU, "rdtscp", "off" },
+    { "Opteron_G5" "-" TYPE_X86_CPU, "npt", "off" },
+    { "Opteron_G5" "-" TYPE_X86_CPU, "nrip-save", "off" },
+    { "EPYC" "-" TYPE_X86_CPU, "npt", "off" },
+    { "EPYC" "-" TYPE_X86_CPU, "nrip-save", "off" },
+    { "EPYC-IBPB" "-" TYPE_X86_CPU, "npt", "off" },
+    { "EPYC-IBPB" "-" TYPE_X86_CPU, "nrip-save", "off" },
     { "Skylake-Client" "-" TYPE_X86_CPU,      "mpx", "on" },
     { "Skylake-Client-IBRS" "-" TYPE_X86_CPU, "mpx", "on" },
     { "Skylake-Server" "-" TYPE_X86_CPU,      "mpx", "on" },
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 2f5412592d..d170637599 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -2801,6 +2801,8 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_EXT3_3DNOWPREFETCH | CPUID_EXT3_MISALIGNSSE |
             CPUID_EXT3_SSE4A | CPUID_EXT3_ABM | CPUID_EXT3_SVM |
             CPUID_EXT3_LAHF_LM,
+        .features[FEAT_SVM] =
+            CPUID_SVM_NPT | CPUID_SVM_NRIPSAVE,
         /* no xsaveopt! */
         .xlevel = 0x8000001A,
         .model_id = "AMD Opteron 62xx class CPU",
@@ -2831,6 +2833,8 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_EXT3_3DNOWPREFETCH | CPUID_EXT3_MISALIGNSSE |
             CPUID_EXT3_SSE4A | CPUID_EXT3_ABM | CPUID_EXT3_SVM |
             CPUID_EXT3_LAHF_LM,
+        .features[FEAT_SVM] =
+            CPUID_SVM_NPT | CPUID_SVM_NRIPSAVE,
         /* no xsaveopt! */
         .xlevel = 0x8000001A,
         .model_id = "AMD Opteron 63xx class CPU",
@@ -2877,6 +2881,8 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_XSAVE_XGETBV1,
         .features[FEAT_6_EAX] =
             CPUID_6_EAX_ARAT,
+        .features[FEAT_SVM] =
+            CPUID_SVM_NPT | CPUID_SVM_NRIPSAVE,
         .xlevel = 0x8000001E,
         .model_id = "AMD EPYC Processor",
         .cache_info = &epyc_cache_info,
@@ -2925,6 +2931,8 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_XSAVE_XGETBV1,
         .features[FEAT_6_EAX] =
             CPUID_6_EAX_ARAT,
+        .features[FEAT_SVM] =
+            CPUID_SVM_NPT | CPUID_SVM_NRIPSAVE,
         .xlevel = 0x8000001E,
         .model_id = "AMD EPYC Processor (with IBPB)",
         .cache_info = &epyc_cache_info,
-- 
2.20.1