[PATCH 2/2] qemu-kvm: Add svm cpuid features

Joerg Roedel
2010-09-10T15:40:07Z

This patch adds the svm cpuid feature flags to the qemu
intialization path.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
target-i386/cpu.h | 12 +++++++
target-i386/cpuid.c | 80 ++++++++++++++++++++++++++++++++++++++++-----------
target-i386/kvm.c | 3 ++
3 files changed, 78 insertions(+), 17 deletions(-)

diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 1144d4e..77eeab1 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -405,6 +405,17 @@
#define CPUID_EXT3_IBS (1 << 10)
#define CPUID_EXT3_SKINIT (1 << 12)

+#define CPUID_SVM_NPT (1 << 0)
+#define CPUID_SVM_LBRV (1 << 1)
+#define CPUID_SVM_SVMLOCK (1 << 2)
+#define CPUID_SVM_NRIPSAVE (1 << 3)
+#define CPUID_SVM_TSCSCALE (1 << 4)
+#define CPUID_SVM_VMCBCLEAN (1 << 5)
+#define CPUID_SVM_FLUSHASID (1 << 6)
+#define CPUID_SVM_DECODEASSIST (1 << 7)
+#define CPUID_SVM_PAUSEFILTER (1 << 10)
+#define CPUID_SVM_PFTHRESHOLD (1 << 12)
+
#define CPUID_VENDOR_INTEL_1 0x756e6547 /* "Genu" */
#define CPUID_VENDOR_INTEL_2 0x49656e69 /* "ineI" */
#define CPUID_VENDOR_INTEL_3 0x6c65746e /* "ntel" */
@@ -702,6 +713,7 @@ typedef struct CPUX86State {
uint8_t has_error_code;
uint32_t sipi_vector;
uint32_t cpuid_kvm_features;
+ uint32_t cpuid_svm_features;

/* in order to simplify APIC support, we leave this pointer to the
user */
diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
index 3fcf78f..ea1ac73 100644
--- a/target-i386/cpuid.c
+++ b/target-i386/cpuid.c
@@ -79,6 +79,17 @@ static const char *kvm_feature_name[] = {
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
};

+static const char *svm_feature_name[] = {
+ "npt", "lbrv", "svm_lock", "nrip_save",
+ "tsc_scale", "vmcb_clean", "flushbyasid", "decodeassists",
+ NULL, NULL, "pause_filter", NULL,
+ "pfthreshold", NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+};
+
/* collects per-function cpuid data
*/
typedef struct model_features_t {
@@ -192,13 +203,15 @@ static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features,
uint32_t *ext_features,
uint32_t *ext2_features,
uint32_t *ext3_features,
- uint32_t *kvm_features)
+ uint32_t *kvm_features,
+ uint32_t *svm_features)
{
if (!lookup_feature(features, flagname, NULL, feature_name) &&
!lookup_feature(ext_features, flagname, NULL, ext_feature_name) &&
!lookup_feature(ext2_features, flagname, NULL, ext2_feature_name) &&
!lookup_feature(ext3_features, flagname, NULL, ext3_feature_name) &&
- !lookup_feature(kvm_features, flagname, NULL, kvm_feature_name))
+ !lookup_feature(kvm_features, flagname, NULL, kvm_feature_name) &&
+ !lookup_feature(svm_features, flagname, NULL, svm_feature_name))
fprintf(stderr, "CPU feature %s not found\n", flagname);
}

@@ -210,7 +223,8 @@ typedef struct x86_def_t {
int family;
int model;
int stepping;
- uint32_t features, ext_features, ext2_features, ext3_features, kvm_features;
+ uint32_t features, ext_features, ext2_features, ext3_features;
+ uint32_t kvm_features, svm_features;
uint32_t xlevel;
char model_id[48];
int vendor_override;
@@ -253,6 +267,7 @@ typedef struct x86_def_t {
CPUID_EXT2_PDPE1GB */
#define TCG_EXT3_FEATURES (CPUID_EXT3_LAHF_LM | CPUID_EXT3_SVM | \
CPUID_EXT3_CR8LEG | CPUID_EXT3_ABM | CPUID_EXT3_SSE4A)
+#define TCG_SVM_FEATURES 0

/* maintains list of cpu model definitions
*/
@@ -278,6 +293,8 @@ static x86_def_t builtin_x86_defs[] = {
CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX,
.ext3_features = CPUID_EXT3_LAHF_LM | CPUID_EXT3_SVM |
CPUID_EXT3_ABM | CPUID_EXT3_SSE4A,
+ .svm_features = CPUID_SVM_NPT | CPUID_SVM_LBRV | CPUID_SVM_NRIPSAVE |
+ CPUID_SVM_VMCBCLEAN,
.xlevel = 0x8000000A,
.model_id = "QEMU Virtual CPU version " QEMU_VERSION,
},
@@ -305,6 +322,8 @@ static x86_def_t builtin_x86_defs[] = {
CPUID_EXT3_OSVW, CPUID_EXT3_IBS */
.ext3_features = CPUID_EXT3_LAHF_LM | CPUID_EXT3_SVM |
CPUID_EXT3_ABM | CPUID_EXT3_SSE4A,
+ .svm_features = CPUID_SVM_NPT | CPUID_SVM_LBRV | CPUID_SVM_NRIPSAVE |
+ CPUID_SVM_VMCBCLEAN,
.xlevel = 0x8000001A,
.model_id = "AMD Phenom(tm) 9550 Quad-Core Processor"
},
@@ -505,6 +524,15 @@ static int cpu_x86_fill_host(x86_def_t *x86_cpu_def)
cpu_x86_fill_model_id(x86_cpu_def->model_id);
x86_cpu_def->vendor_override = 0;

+
+ /*
+ * Every SVM feature requires emulation support in KVM - so we can't just
+ * read the host features here. KVM might even support SVM features not
+ * available on the host hardware
+ */
+ x86_cpu_def->svm_features = CPUID_SVM_NPT | CPUID_SVM_LBRV |
+ CPUID_SVM_NRIPSAVE | CPUID_SVM_VMCBCLEAN;
+
return 0;
}

@@ -560,8 +588,14 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model)

char *s = strdup(cpu_model);
char *featurestr, *name = strtok(s, ",");
- uint32_t plus_features = 0, plus_ext_features = 0, plus_ext2_features = 0, plus_ext3_features = 0, plus_kvm_features = 0;
- uint32_t minus_features = 0, minus_ext_features = 0, minus_ext2_features = 0, minus_ext3_features = 0, minus_kvm_features = 0;
+ /* Features to be added*/
+ uint32_t plus_features = 0, plus_ext_features = 0;
+ uint32_t plus_ext2_features = 0, plus_ext3_features = 0;
+ uint32_t plus_kvm_features = 0, plus_svm_features = 0;
+ /* Features to be removed */
+ uint32_t minus_features = 0, minus_ext_features = 0;
+ uint32_t minus_ext2_features = 0, minus_ext3_features = 0;
+ uint32_t minus_kvm_features = 0, minus_svm_features = 0;
uint32_t numvalue;

for (def = x86_defs; def; def = def->next)
@@ -579,16 +613,22 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model)

add_flagname_to_bitmaps("hypervisor", &plus_features,
&plus_ext_features, &plus_ext2_features, &plus_ext3_features,
- &plus_kvm_features);
+ &plus_kvm_features, &plus_svm_features);

featurestr = strtok(NULL, ",");

while (featurestr) {
char *val;
if (featurestr[0] == '+') {
- add_flagname_to_bitmaps(featurestr + 1, &plus_features, &plus_ext_features, &plus_ext2_features, &plus_ext3_features, &plus_kvm_features);
+ add_flagname_to_bitmaps(featurestr + 1, &plus_features,
+ &plus_ext_features, &plus_ext2_features,
+ &plus_ext3_features, &plus_kvm_features,
+ &plus_svm_features);
} else if (featurestr[0] == '-') {
- add_flagname_to_bitmaps(featurestr + 1, &minus_features, &minus_ext_features, &minus_ext2_features, &minus_ext3_features, &minus_kvm_features);
+ add_flagname_to_bitmaps(featurestr + 1, &minus_features,
+ &minus_ext_features, &minus_ext2_features,
+ &minus_ext3_features, &minus_kvm_features,
+ &minus_svm_features);
} else if ((val = strchr(featurestr, '='))) {
*val = 0; val++;
if (!strcmp(featurestr, "family")) {
@@ -670,11 +710,13 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model)
x86_cpu_def->ext2_features |= plus_ext2_features;
x86_cpu_def->ext3_features |= plus_ext3_features;
x86_cpu_def->kvm_features |= plus_kvm_features;
+ x86_cpu_def->svm_features |= plus_svm_features;
x86_cpu_def->features &= ~minus_features;
x86_cpu_def->ext_features &= ~minus_ext_features;
x86_cpu_def->ext2_features &= ~minus_ext2_features;
x86_cpu_def->ext3_features &= ~minus_ext3_features;
x86_cpu_def->kvm_features &= ~minus_kvm_features;
+ x86_cpu_def->svm_features &= ~minus_svm_features;
if (check_cpuid) {
if (check_features_against_host(x86_cpu_def) && enforce_cpuid)
goto error;
@@ -816,6 +858,7 @@ int cpu_x86_register (CPUX86State *env, const char *cpu_model)
env->cpuid_ext3_features = def->ext3_features;
env->cpuid_xlevel = def->xlevel;
env->cpuid_kvm_features = def->kvm_features;
+ env->cpuid_svm_features = def->svm_features;
if (!kvm_enabled()) {
env->cpuid_features &= TCG_FEATURES;
env->cpuid_ext_features &= TCG_EXT_FEATURES;
@@ -825,6 +868,7 @@ int cpu_x86_register (CPUX86State *env, const char *cpu_model)
#endif
);
env->cpuid_ext3_features &= TCG_EXT3_FEATURES;
+ env->cpuid_svm_features &= TCG_SVM_FEATURES;
}
{
const char *model_id = def->model_id;
@@ -1135,11 +1179,6 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*ecx |= 1 << 1; /* CmpLegacy bit */
}
}
-
- if (kvm_enabled()) {
- /* Nested SVM not yet supported in upstream QEMU */
- *ecx &= ~CPUID_EXT3_SVM;
- }
break;
case 0x80000002:
case 0x80000003:
@@ -1184,10 +1223,17 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
}
break;
case 0x8000000A:
- *eax = 0x00000001; /* SVM Revision */
- *ebx = 0x00000010; /* nr of ASIDs */
- *ecx = 0;
- *edx = 0; /* optional features */
+ if (env->cpuid_ext3_features & CPUID_EXT3_SVM) {
+ *eax = 0x00000001; /* SVM Revision */
+ *ebx = 0x00000010; /* nr of ASIDs */
+ *ecx = 0;
+ *edx = env->cpuid_svm_features; /* optional features */
+ } else {
+ *eax = 0;
+ *ebx = 0;
+ *ecx = 0;
+ *edx = 0;
+ }
break;
default:
/* reserved values: zero */
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index a33d2fa..74e7b4f 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -192,6 +192,9 @@ int kvm_arch_init_vcpu(CPUState *env)
0, R_EDX);
env->cpuid_ext3_features &= kvm_arch_get_supported_cpuid(env, 0x80000001,
0, R_ECX);
+ env->cpuid_svm_features &= kvm_arch_get_supported_cpuid(env, 0x8000000A,
+ 0, R_EDX);
+

cpuid_i = 0;

--
1.7.0.4