Setting the same PLE parameter arbitrarily for different
workloads is not a good solution. The solution enables
per domain PLE which gives user ability to set PLE parameter
for different domain for better performance.
Signed-off-by: Xuekun Hu <xuekun.hu@xxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 6 ++++++
arch/x86/kvm/svm.c | 21 +++++++++++++++++++++
arch/x86/kvm/vmx.c | 32 ++++++++++++++++++++++++++++++--
arch/x86/kvm/x86.c | 15 ++++++++++++++-
include/linux/kvm.h | 3 +++
5 files changed, 74 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b2e11f4..b54f38b 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -569,6 +569,8 @@ struct kvm_arch {
#ifdef CONFIG_KVM_MMU_AUDIT
int audit_point;
#endif
+ int ple_gap;
+ int ple_window;
};
struct kvm_vm_stat {
@@ -621,6 +623,10 @@ struct kvm_x86_ops {
int (*hardware_setup)(void); /* __init */
void (*hardware_unsetup)(void); /* __exit */
bool (*cpu_has_accelerated_tpr)(void);
+ bool (*cpu_has_ple)(void);
+ void (*ple_setup)(struct kvm *kvm); /* __init */
+ void (*set_ple_gap)(struct kvm *kvm, int value);
+ void (*set_ple_window)(struct kvm *kvm, int value);
void (*cpuid_update)(struct kvm_vcpu *vcpu);
/* Create, but do not attach this VCPU */
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d017df3..311ed96 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3976,6 +3976,23 @@ static bool svm_cpu_has_accelerated_tpr(void)
return false;
}
+static bool cpu_has_svm_ple(void)
+{
+ return false;
+}
+
+static void svm_ple_setup(struct kvm *kvm)
+{
+}
+
+static void svm_set_ple_gap(struct kvm *kvm, int value)
+{
+}
+
+static void svm_set_ple_window(struct kvm *kvm, int value)
+{
+}
+
static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
{
return 0;
@@ -4229,6 +4246,10 @@ static struct kvm_x86_ops svm_x86_ops = {
.hardware_enable = svm_hardware_enable,
.hardware_disable = svm_hardware_disable,
.cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
+ .cpu_has_ple = cpu_has_svm_ple,
+ .ple_setup = svm_ple_setup,
+ .set_ple_gap = svm_set_ple_gap,
+ .set_ple_window = svm_set_ple_window,
.vcpu_create = svm_create_vcpu,
.vcpu_free = svm_free_vcpu,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index ad6b1dd..b761669 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3805,6 +3805,29 @@ static void ept_set_mmio_spte_mask(void)
kvm_mmu_set_mmio_spte_mask(0xffull << 49 | 0x6ull);
}
+static void vmx_ple_setup(struct kvm *kvm)
+{
+ /*
+ * set up ple default value
+ */
+ if (ple_gap) {
+ kvm->arch.ple_gap = ple_gap;
+ kvm->arch.ple_window = ple_window;
+ }
+}
+
+static void vmx_set_ple_gap(struct kvm *kvm, int value)
+{
+ if (ple_gap)
+ kvm->arch.ple_gap = value;
+}
+
+static void vmx_set_ple_window(struct kvm *kvm, int value)
+{
+ if (ple_gap)
+ kvm->arch.ple_window = value;
+}
+
/*
* Sets up the vmcs for emulated real mode.
*/
@@ -3814,6 +3837,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
unsigned long a;
#endif
int i;
+ struct kvm *kvm = vmx->vcpu.kvm;
/* I/O */
vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
@@ -3836,8 +3860,8 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
}
if (ple_gap) {
- vmcs_write32(PLE_GAP, ple_gap);
- vmcs_write32(PLE_WINDOW, ple_window);
+ vmcs_write32(PLE_GAP, kvm->arch.ple_gap);
+ vmcs_write32(PLE_WINDOW, kvm->arch.ple_window);
}
vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
@@ -7233,6 +7257,10 @@ static struct kvm_x86_ops vmx_x86_ops = {
.hardware_enable = hardware_enable,
.hardware_disable = hardware_disable,
.cpu_has_accelerated_tpr = report_flexpriority,
+ .cpu_has_ple = cpu_has_vmx_ple,
+ .ple_setup = vmx_ple_setup,
+ .set_ple_gap = vmx_set_ple_gap,
+ .set_ple_window = vmx_set_ple_window,
.vcpu_create = vmx_create_vcpu,
.vcpu_free = vmx_free_vcpu,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1eefebe..89b8291 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2197,6 +2197,9 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_VAPIC:
r = !kvm_x86_ops->cpu_has_accelerated_tpr();
break;
+ case KVM_CAP_PLE:
+ r = kvm_x86_ops->cpu_has_ple();
+ break;
case KVM_CAP_NR_VCPUS:
r = KVM_SOFT_MAX_VCPUS;
break;
@@ -3462,7 +3465,16 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = 0;
break;
}
-
+ case KVM_SET_PLE_GAP: {
+ kvm_x86_ops->set_ple_gap(kvm, arg);
+ r = 0;
+ break;
+ }
+ case KVM_SET_PLE_WINDOW: {
+ kvm_x86_ops->set_ple_window(kvm, arg);
+ r = 0;
+ break;
+ }
default:
;
}
@@ -6295,6 +6307,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
raw_spin_lock_init(&kvm->arch.tsc_write_lock);
mutex_init(&kvm->arch.apic_map_lock);
+ kvm_x86_ops->ple_setup(kvm);
return 0;
}
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 0a6d6ba..02d499e 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -626,6 +626,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_READONLY_MEM 81
#endif
#define KVM_CAP_IRQFD_RESAMPLE 82
+#define KVM_CAP_PLE 83
#ifdef KVM_CAP_IRQ_ROUTING
@@ -786,6 +787,8 @@ struct kvm_msi {
struct kvm_userspace_memory_region)
#define KVM_SET_TSS_ADDR _IO(KVMIO, 0x47)
#define KVM_SET_IDENTITY_MAP_ADDR _IOW(KVMIO, 0x48, __u64)
+#define KVM_SET_PLE_GAP _IOW(KVMIO, 0x49, __u32)
+#define KVM_SET_PLE_WINDOW _IOW(KVMIO, 0x4a, __u32)
/* enable ucontrol for s390 */
struct kvm_s390_ucas_mapping {
--
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