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[Qemu-arm] [PATCH V8 1/2] arm: Add an option to turn on/off vPMU support
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From: |
Wei Huang |
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Subject: |
[Qemu-arm] [PATCH V8 1/2] arm: Add an option to turn on/off vPMU support |
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Date: |
Wed, 26 Oct 2016 02:28:20 -0400 |
This patch adds a pmu=[on/off] option to enable/disable vPMU support
in guest vCPU. It allows virt tools, such as libvirt, to determine the
exsitence of vPMU and configure it. Note this option is only available
for cortex-a57/cortex-53/ host CPUs, but unavailable on ARMv7 and other
processors. Also even though "pmu=" option is available for TCG mode,
setting it doesn't turn PMU on.
Signed-off-by: Wei Huang <address@hidden>
---
hw/arm/virt-acpi-build.c | 2 +-
hw/arm/virt.c | 2 +-
target-arm/cpu.c | 15 +++++++++++++++
target-arm/cpu.h | 1 +
target-arm/cpu64.c | 2 ++
target-arm/kvm64.c | 17 ++++++++++++++---
6 files changed, 34 insertions(+), 5 deletions(-)
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index fa0655a..49898df 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -539,7 +539,7 @@ build_madt(GArray *table_data, BIOSLinker *linker,
VirtGuestInfo *guest_info)
gicc->uid = i;
gicc->flags = cpu_to_le32(ACPI_GICC_ENABLED);
- if (armcpu->has_pmu) {
+ if (arm_feature(&armcpu->env, ARM_FEATURE_PMU)) {
gicc->performance_interrupt = cpu_to_le32(PPI(VIRTUAL_PMU_IRQ));
}
}
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 895446f..074d11c 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -490,7 +490,7 @@ static void fdt_add_pmu_nodes(const VirtBoardInfo *vbi, int
gictype)
CPU_FOREACH(cpu) {
armcpu = ARM_CPU(cpu);
- if (!armcpu->has_pmu ||
+ if (!arm_feature(&armcpu->env, ARM_FEATURE_PMU) ||
!kvm_arm_pmu_create(cpu, PPI(VIRTUAL_PMU_IRQ))) {
return;
}
diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 1b9540e..655a1f8 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -19,6 +19,7 @@
*/
#include "qemu/osdep.h"
+#include "qemu/error-report.h"
#include "qapi/error.h"
#include "cpu.h"
#include "internals.h"
@@ -509,6 +510,10 @@ static Property arm_cpu_rvbar_property =
static Property arm_cpu_has_el3_property =
DEFINE_PROP_BOOL("has_el3", ARMCPU, has_el3, true);
+/* use property name "pmu" to match other archs and virt tools */
+static Property arm_cpu_has_pmu_property =
+ DEFINE_PROP_BOOL("pmu", ARMCPU, has_pmu, true);
+
static Property arm_cpu_has_mpu_property =
DEFINE_PROP_BOOL("has-mpu", ARMCPU, has_mpu, true);
@@ -552,6 +557,11 @@ static void arm_cpu_post_init(Object *obj)
#endif
}
+ if (arm_feature(&cpu->env, ARM_FEATURE_PMU)) {
+ qdev_property_add_static(DEVICE(obj), &arm_cpu_has_pmu_property,
+ &error_abort);
+ }
+
if (arm_feature(&cpu->env, ARM_FEATURE_MPU)) {
qdev_property_add_static(DEVICE(obj), &arm_cpu_has_mpu_property,
&error_abort);
@@ -648,6 +658,11 @@ static void arm_cpu_realizefn(DeviceState *dev, Error
**errp)
cpu->id_aa64pfr0 &= ~0xf000;
}
+ if (!cpu->has_pmu || !kvm_enabled()) {
+ cpu->has_pmu = false;
+ unset_feature(env, ARM_FEATURE_PMU);
+ }
+
if (!arm_feature(env, ARM_FEATURE_EL2)) {
/* Disable the hypervisor feature bits in the processor feature
* registers if we don't have EL2. These are id_pfr1[15:12] and
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 2218c00..b97b93b 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -1129,6 +1129,7 @@ enum arm_features {
ARM_FEATURE_V8_SHA256, /* implements SHA256 part of v8 Crypto Extensions */
ARM_FEATURE_V8_PMULL, /* implements PMULL part of v8 Crypto Extensions */
ARM_FEATURE_THUMB_DSP, /* DSP insns supported in the Thumb encodings */
+ ARM_FEATURE_PMU, /* has PMU support */
};
static inline int arm_feature(CPUARMState *env, int feature)
diff --git a/target-arm/cpu64.c b/target-arm/cpu64.c
index 1635deb..549cb1e 100644
--- a/target-arm/cpu64.c
+++ b/target-arm/cpu64.c
@@ -111,6 +111,7 @@ static void aarch64_a57_initfn(Object *obj)
set_feature(&cpu->env, ARM_FEATURE_V8_PMULL);
set_feature(&cpu->env, ARM_FEATURE_CRC);
set_feature(&cpu->env, ARM_FEATURE_EL3);
+ set_feature(&cpu->env, ARM_FEATURE_PMU);
cpu->kvm_target = QEMU_KVM_ARM_TARGET_CORTEX_A57;
cpu->midr = 0x411fd070;
cpu->revidr = 0x00000000;
@@ -166,6 +167,7 @@ static void aarch64_a53_initfn(Object *obj)
set_feature(&cpu->env, ARM_FEATURE_V8_PMULL);
set_feature(&cpu->env, ARM_FEATURE_CRC);
set_feature(&cpu->env, ARM_FEATURE_EL3);
+ set_feature(&cpu->env, ARM_FEATURE_PMU);
cpu->kvm_target = QEMU_KVM_ARM_TARGET_CORTEX_A53;
cpu->midr = 0x410fd034;
cpu->revidr = 0x00000000;
diff --git a/target-arm/kvm64.c b/target-arm/kvm64.c
index 5faa76c..6111109 100644
--- a/target-arm/kvm64.c
+++ b/target-arm/kvm64.c
@@ -428,6 +428,11 @@ static inline void set_feature(uint64_t *features, int
feature)
*features |= 1ULL << feature;
}
+static inline void unset_feature(uint64_t *features, int feature)
+{
+ *features &= ~(1ULL << feature);
+}
+
bool kvm_arm_get_host_cpu_features(ARMHostCPUClass *ahcc)
{
/* Identify the feature bits corresponding to the host CPU, and
@@ -469,6 +474,7 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUClass *ahcc)
set_feature(&features, ARM_FEATURE_VFP4);
set_feature(&features, ARM_FEATURE_NEON);
set_feature(&features, ARM_FEATURE_AARCH64);
+ set_feature(&features, ARM_FEATURE_PMU);
ahcc->features = features;
@@ -482,6 +488,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
int ret;
uint64_t mpidr;
ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
if (cpu->kvm_target == QEMU_KVM_ARM_TARGET_NONE ||
!object_dynamic_cast(OBJECT(cpu), TYPE_AARCH64_CPU)) {
@@ -501,10 +508,14 @@ int kvm_arch_init_vcpu(CPUState *cs)
if (!arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_EL1_32BIT;
}
- if (kvm_irqchip_in_kernel() &&
- kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PMU_V3)) {
- cpu->has_pmu = true;
+ if (!kvm_irqchip_in_kernel() ||
+ !kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PMU_V3)) {
+ cpu->has_pmu = false;
+ }
+ if (cpu->has_pmu) {
cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_PMU_V3;
+ } else {
+ unset_feature(&env->features, ARM_FEATURE_PMU);
}
/* Do KVM_ARM_VCPU_INIT ioctl */
--
1.8.3.1