[PATCH v9 2/7] i386: Add new property to control cache info

Babu Moger
2018-05-14T16:41:51Z

The property legacy-cache will be used to control the cache information.
If user passes "-cpu legacy-cache" then older information will
be displayed even if the hardware supports new information. Otherwise
use the statically loaded cache definitions if available.

Renamed the previous cache structures to legacy_*. If there is any change in
the cache information, then it needs to be initialized in builtin_x86_defs.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Tested-by: Geoffrey McRae <geoff@hostfission.com>
---
include/hw/i386/pc.h | 5 +++
target/i386/cpu.c | 97 ++++++++++++++++++++++++++++++++------------
target/i386/cpu.h | 5 +++
3 files changed, 81 insertions(+), 26 deletions(-)

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 69fced9aea..df15deefca 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -306,6 +306,11 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);

#define PC_COMPAT_2_12 \
HW_COMPAT_2_12 \
+ {\
+ .driver = TYPE_X86_CPU,\
+ .property = "legacy-cache",\
+ .value = "on",\
+ },

#define PC_COMPAT_2_11 \
HW_COMPAT_2_11 \
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index f9ebfcfe79..e1daff37ab 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -336,10 +336,14 @@ static void encode_cache_cpuid80000006(CPUCacheInfo *l2,
}
}

-/* Definitions of the hardcoded cache entries we expose: */
+/*
+ * Definitions of the hardcoded cache entries we expose:
+ * These are legacy cache values. If there is a need to change any
+ * of these values please use builtin_x86_defs
+ */

/* L1 data cache: */
-static CPUCacheInfo l1d_cache = {
+static CPUCacheInfo legacy_l1d_cache = {
.type = DCACHE,
.level = 1,
.size = 32 * KiB,
@@ -352,7 +356,7 @@ static CPUCacheInfo l1d_cache = {
};

/*FIXME: CPUID leaf 0x80000005 is inconsistent with leaves 2 & 4 */
-static CPUCacheInfo l1d_cache_amd = {
+static CPUCacheInfo legacy_l1d_cache_amd = {
.type = DCACHE,
.level = 1,
.size = 64 * KiB,
@@ -366,7 +370,7 @@ static CPUCacheInfo l1d_cache_amd = {
};

/* L1 instruction cache: */
-static CPUCacheInfo l1i_cache = {
+static CPUCacheInfo legacy_l1i_cache = {
.type = ICACHE,
.level = 1,
.size = 32 * KiB,
@@ -379,7 +383,7 @@ static CPUCacheInfo l1i_cache = {
};

/*FIXME: CPUID leaf 0x80000005 is inconsistent with leaves 2 & 4 */
-static CPUCacheInfo l1i_cache_amd = {
+static CPUCacheInfo legacy_l1i_cache_amd = {
.type = ICACHE,
.level = 1,
.size = 64 * KiB,
@@ -393,7 +397,7 @@ static CPUCacheInfo l1i_cache_amd = {
};

/* Level 2 unified cache: */
-static CPUCacheInfo l2_cache = {
+static CPUCacheInfo legacy_l2_cache = {
.type = UNIFIED_CACHE,
.level = 2,
.size = 4 * MiB,
@@ -406,7 +410,7 @@ static CPUCacheInfo l2_cache = {
};

/*FIXME: CPUID leaf 2 descriptor is inconsistent with CPUID leaf 4 */
-static CPUCacheInfo l2_cache_cpuid2 = {
+static CPUCacheInfo legacy_l2_cache_cpuid2 = {
.type = UNIFIED_CACHE,
.level = 2,
.size = 2 * MiB,
@@ -416,7 +420,7 @@ static CPUCacheInfo l2_cache_cpuid2 = {

/*FIXME: CPUID leaf 0x80000006 is inconsistent with leaves 2 & 4 */
-static CPUCacheInfo l2_cache_amd = {
+static CPUCacheInfo legacy_l2_cache_amd = {
.type = UNIFIED_CACHE,
.level = 2,
.size = 512 * KiB,
@@ -428,7 +432,7 @@ static CPUCacheInfo l2_cache_amd = {
};

/* Level 3 unified cache: */
-static CPUCacheInfo l3_cache = {
+static CPUCacheInfo legacy_l3_cache = {
.type = UNIFIED_CACHE,
.level = 3,
.size = 16 * MiB,
@@ -3337,6 +3341,10 @@ static void x86_cpu_load_def(X86CPU *cpu, X86CPUDefinition *def, Error **errp)
env->features[w] = def->features[w];
}

+ /* Store Cache information from the X86CPUDefinition if available */
+ env->cache_info = def->cache_info;
+ cpu->legacy_cache = def->cache_info ? 0 : 1;
+
/* Special cases not set in the X86CPUDefinition structs: */
/* TODO: in-kernel irqchip for hvf */
if (kvm_enabled()) {
@@ -3686,11 +3694,21 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
if (!cpu->enable_l3_cache) {
*ecx = 0;
} else {
- *ecx = cpuid2_cache_descriptor(&l3_cache);
+ if (env->cache_info && !cpu->legacy_cache) {
+ *ecx = cpuid2_cache_descriptor(&env->cache_info->l3_cache);
+ } else {
+ *ecx = cpuid2_cache_descriptor(&legacy_l3_cache);
+ }
+ }
+ if (env->cache_info && !cpu->legacy_cache) {
+ *edx = (cpuid2_cache_descriptor(&env->cache_info->l1d_cache) << 16) |
+ (cpuid2_cache_descriptor(&env->cache_info->l1i_cache) << 8) |
+ (cpuid2_cache_descriptor(&env->cache_info->l2_cache));
+ } else {
+ *edx = (cpuid2_cache_descriptor(&legacy_l1d_cache) << 16) |
+ (cpuid2_cache_descriptor(&legacy_l1i_cache) << 8) |
+ (cpuid2_cache_descriptor(&legacy_l2_cache_cpuid2));
}
- *edx = (cpuid2_cache_descriptor(&l1d_cache) << 16) |
- (cpuid2_cache_descriptor(&l1i_cache) << 8) |
- (cpuid2_cache_descriptor(&l2_cache_cpuid2));
break;
case 4:
/* cache info: needed for Core compatibility */
@@ -3703,27 +3721,35 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
}
} else {
*eax = 0;
+ CPUCacheInfo *l1d, *l1i, *l2, *l3;
+ if (env->cache_info && !cpu->legacy_cache) {
+ l1d = &env->cache_info->l1d_cache;
+ l1i = &env->cache_info->l1i_cache;
+ l2 = &env->cache_info->l2_cache;
+ l3 = &env->cache_info->l3_cache;
+ } else {
+ l1d = &legacy_l1d_cache;
+ l1i = &legacy_l1i_cache;
+ l2 = &legacy_l2_cache;
+ l3 = &legacy_l3_cache;
+ }
switch (count) {
case 0: /* L1 dcache info */
- encode_cache_cpuid4(&l1d_cache,
- 1, cs->nr_cores,
+ encode_cache_cpuid4(l1d, 1, cs->nr_cores,
eax, ebx, ecx, edx);
break;
case 1: /* L1 icache info */
- encode_cache_cpuid4(&l1i_cache,
- 1, cs->nr_cores,
+ encode_cache_cpuid4(l1i, 1, cs->nr_cores,
eax, ebx, ecx, edx);
break;
case 2: /* L2 cache info */
- encode_cache_cpuid4(&l2_cache,
- cs->nr_threads, cs->nr_cores,
+ encode_cache_cpuid4(l2, cs->nr_threads, cs->nr_cores,
eax, ebx, ecx, edx);
break;
case 3: /* L3 cache info */
pkg_offset = apicid_pkg_offset(cs->nr_cores, cs->nr_threads);
if (cpu->enable_l3_cache) {
- encode_cache_cpuid4(&l3_cache,
- (1 << pkg_offset), cs->nr_cores,
+ encode_cache_cpuid4(l3, (1 << pkg_offset), cs->nr_cores,
eax, ebx, ecx, edx);
break;
}
@@ -3936,8 +3962,13 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
(L1_ITLB_2M_ASSOC << 8) | (L1_ITLB_2M_ENTRIES);
*ebx = (L1_DTLB_4K_ASSOC << 24) | (L1_DTLB_4K_ENTRIES << 16) | \
(L1_ITLB_4K_ASSOC << 8) | (L1_ITLB_4K_ENTRIES);
- *ecx = encode_cache_cpuid80000005(&l1d_cache_amd);
- *edx = encode_cache_cpuid80000005(&l1i_cache_amd);
+ if (env->cache_info && !cpu->legacy_cache) {
+ *ecx = encode_cache_cpuid80000005(&env->cache_info->l1d_cache);
+ *edx = encode_cache_cpuid80000005(&env->cache_info->l1i_cache);
+ } else {
+ *ecx = encode_cache_cpuid80000005(&legacy_l1d_cache_amd);
+ *edx = encode_cache_cpuid80000005(&legacy_l1i_cache_amd);
+ }
break;
case 0x80000006:
/* cache info (L2 cache) */
@@ -3953,9 +3984,17 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
(L2_DTLB_4K_ENTRIES << 16) | \
(AMD_ENC_ASSOC(L2_ITLB_4K_ASSOC) << 12) | \
(L2_ITLB_4K_ENTRIES);
- encode_cache_cpuid80000006(&l2_cache_amd,
- cpu->enable_l3_cache ? &l3_cache : NULL,
- ecx, edx);
+ if (env->cache_info && !cpu->legacy_cache) {
+ encode_cache_cpuid80000006(&env->cache_info->l2_cache,
+ cpu->enable_l3_cache ?
+ &env->cache_info->l3_cache : NULL,
+ ecx, edx);
+ } else {
+ encode_cache_cpuid80000006(&legacy_l2_cache_amd,
+ cpu->enable_l3_cache ?
+ &legacy_l3_cache : NULL,
+ ecx, edx);
+ }
break;
case 0x80000007:
*eax = 0;
@@ -5133,6 +5172,12 @@ static Property x86_cpu_properties[] = {
false),
DEFINE_PROP_BOOL("vmware-cpuid-freq", X86CPU, vmware_cpuid_freq, true),
DEFINE_PROP_BOOL("tcg-cpuid", X86CPU, expose_tcg, true),
+ /*
+ * lecacy_cache defaults to CPU model being chosen. This is set in
+ * x86_cpu_load_def based on cache_info which is initialized in
+ * builtin_x86_defs
+ */
+ DEFINE_PROP_BOOL("legacy-cache", X86CPU, legacy_cache, false),

/*
* From "Requirements for Implementing the Microsoft
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 318e66108a..1f9ccd47d9 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1395,6 +1395,11 @@ struct X86CPU {
*/
bool enable_l3_cache;

+ /* Compatibility bits for old machine types.
+ * If true present the old cache topology information
+ */
+ bool legacy_cache;
+
/* Compatibility bits for old machine types: */
bool enable_cpuid_0xb;

--
2.17.0