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[Qemu-devel] [PATCH v14 5/6] i386: Disable TOPOEXT feature if it cannot
From: |
Babu Moger |
Subject: |
[Qemu-devel] [PATCH v14 5/6] i386: Disable TOPOEXT feature if it cannot be supported |
Date: |
Wed, 13 Jun 2018 21:18:26 -0400 |
Disable the TOPOEXT feature if it cannot be supported.
We cannot support this feature with more than 2 nr_threads
or more than 32 cores in a socket.
Signed-off-by: Babu Moger <address@hidden>
---
target/i386/cpu.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 2eb26da..637d8eb 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -4765,7 +4765,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error
**errp)
X86CPUClass *xcc = X86_CPU_GET_CLASS(dev);
CPUX86State *env = &cpu->env;
Error *local_err = NULL;
- static bool ht_warned;
+ static bool ht_warned, topo_warned;
if (xcc->host_cpuid_required && !accel_uses_host_cpuid()) {
char *name = x86_cpu_class_get_model_name(xcc);
@@ -4779,6 +4779,21 @@ static void x86_cpu_realizefn(DeviceState *dev, Error
**errp)
return;
}
+ /* Disable TOPOEXT if topology cannot be supported */
+ if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_TOPOEXT) {
+ if (!topology_supports_topoext(MAX_CORES_IN_NODE *
MAX_NODES_PER_SOCKET,
+ 2)) {
+ env->features[FEAT_8000_0001_ECX] &= !CPUID_EXT3_TOPOEXT;
+ if (!topo_warned) {
+ error_report("TOPOEXT feature cannot be supported with more"
+ " than %d cores or more than 2 threads per
socket."
+ " Disabling the feature.",
+ (MAX_CORES_IN_NODE * MAX_NODES_PER_SOCKET));
+ topo_warned = true;
+ }
+ }
+ }
+
x86_cpu_expand_features(cpu, &local_err);
if (local_err) {
goto out;
--
1.8.3.1
[Qemu-devel] [PATCH v14 3/6] i386: Disable TOPOEXT feature on pc-2.12, Babu Moger, 2018/06/13
[Qemu-devel] [PATCH v14 1/6] i386: Set TOPOEXT unconditionally for comapatibility, Babu Moger, 2018/06/13