[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PULL 4/5] target-i386: Remove POPCNT from qemu64 and qemu3
From: |
Eduardo Habkost |
Subject: |
[Qemu-devel] [PULL 4/5] target-i386: Remove POPCNT from qemu64 and qemu32 CPU models |
Date: |
Thu, 5 Nov 2015 17:37:10 -0200 |
POPCNT is not available on Penryn and older and on Opteron_G2 and older,
and we want to make the default CPU runnable in most hosts, so it won't
be enabled by default in KVM mode.
We should eventually have all features supported by TCG enabled by
default in TCG mode, but as we don't have a good mechanism today to
ensure we have different defaults in KVM and TCG mode, disable POPCNT in
the qemu64 and qemu32 CPU models entirely.
Reviewed-by: Paolo Bonzini <address@hidden>
Signed-off-by: Eduardo Habkost <address@hidden>
---
include/hw/i386/pc.h | 10 ++++++++++
target-i386/cpu.c | 4 ++--
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 8b54863..4bbc0ff 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -337,6 +337,16 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
.driver = "qemu64" "-" TYPE_X86_CPU,\
.property = "abm",\
.value = "on",\
+ },\
+ {\
+ .driver = "qemu64" "-" TYPE_X86_CPU,\
+ .property = "popcnt",\
+ .value = "on",\
+ },\
+ {\
+ .driver = "qemu32" "-" TYPE_X86_CPU,\
+ .property = "popcnt",\
+ .value = "on",\
},
#define PC_COMPAT_2_3 \
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 90e4529..090d1d8 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -671,7 +671,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA |
CPUID_PSE36,
.features[FEAT_1_ECX] =
- CPUID_EXT_SSE3 | CPUID_EXT_CX16 | CPUID_EXT_POPCNT,
+ CPUID_EXT_SSE3 | CPUID_EXT_CX16,
.features[FEAT_8000_0001_EDX] =
CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX,
.features[FEAT_8000_0001_ECX] =
@@ -771,7 +771,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
.features[FEAT_1_EDX] =
PPRO_FEATURES,
.features[FEAT_1_ECX] =
- CPUID_EXT_SSE3 | CPUID_EXT_POPCNT,
+ CPUID_EXT_SSE3,
.xlevel = 0x80000004,
},
{
--
2.1.0
- [Qemu-devel] [PULL 0/5] X86 queue, 2015-11-05, Eduardo Habkost, 2015/11/05
- [Qemu-devel] [PULL 2/5] target-i386: Remove SSE4a from qemu64 CPU model, Eduardo Habkost, 2015/11/05
- [Qemu-devel] [PULL 1/5] target-i386: Set "check=off" by default on pc-*-2.4 and older, Eduardo Habkost, 2015/11/05
- [Qemu-devel] [PULL 3/5] target-i386: Remove ABM from qemu64 CPU model, Eduardo Habkost, 2015/11/05
- [Qemu-devel] [PULL 4/5] target-i386: Remove POPCNT from qemu64 and qemu32 CPU models,
Eduardo Habkost <=
- [Qemu-devel] [PULL 5/5] target-i386: Enable clflushopt/clwb/pcommit instructions, Eduardo Habkost, 2015/11/05
- Re: [Qemu-devel] [PULL 0/5] X86 queue, 2015-11-05, Peter Maydell, 2015/11/06