From: "Radim Krčmář" <rkrcmar@redhat.com>
To: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
Gleb Natapov <gleb@kernel.org>,
Raghavendra KT <raghavendra.kt@linux.vnet.ibm.com>,
Vinod Chegu <chegu_vinod@hp.com>, Hui-Zhi <hui-zhi.zhao@hp.com>,
Christian Borntraeger <borntraeger@de.ibm.com>
Subject: [PATCH v2 3/6] KVM: VMX: make PLE window per-VCPU
Date: Wed, 20 Aug 2014 22:53:14 +0200 [thread overview]
Message-ID: <1408567997-21222-4-git-send-email-rkrcmar@redhat.com> (raw)
In-Reply-To: <1408567997-21222-1-git-send-email-rkrcmar@redhat.com>
Change PLE window into per-VCPU variable, seeded from module parameter,
to allow greater flexibility.
Brings in a small overhead on every vmentry.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---
arch/x86/kvm/vmx.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2b306f9..18e0e52 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -484,6 +484,9 @@ struct vcpu_vmx {
/* Support for a guest hypervisor (nested VMX) */
struct nested_vmx nested;
+
+ /* Dynamic PLE window. */
+ int ple_window;
};
enum segment_cache_field {
@@ -4402,7 +4405,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
if (ple_gap) {
vmcs_write32(PLE_GAP, ple_gap);
- vmcs_write32(PLE_WINDOW, ple_window);
+ vmx->ple_window = ple_window;
}
vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
@@ -7387,6 +7390,9 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
if (vmx->emulation_required)
return;
+ if (ple_gap)
+ vmcs_write32(PLE_WINDOW, vmx->ple_window);
+
if (vmx->nested.sync_shadow_vmcs) {
copy_vmcs12_to_shadow(vmx);
vmx->nested.sync_shadow_vmcs = false;
--
2.0.4
next prev parent reply other threads:[~2014-08-20 20:54 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-20 20:53 [PATCH v2 0/6] Dynamic Pause Loop Exiting window Radim Krčmář
2014-08-20 20:53 ` [PATCH v2 1/6] KVM: add kvm_arch_sched_in Radim Krčmář
2014-08-21 8:29 ` Paolo Bonzini
2014-08-21 11:38 ` Radim Krčmář
2014-08-21 12:27 ` Paolo Bonzini
2014-08-21 12:50 ` Radim Krčmář
2014-08-21 13:25 ` Paolo Bonzini
2014-08-20 20:53 ` [PATCH v2 2/6] KVM: x86: introduce sched_in to kvm_x86_ops Radim Krčmář
2014-08-20 20:53 ` Radim Krčmář [this message]
2014-08-21 8:25 ` [PATCH v2 3/6] KVM: VMX: make PLE window per-VCPU Paolo Bonzini
2014-08-21 11:38 ` Radim Krčmář
2014-08-20 20:53 ` [PATCH v2 4/6] KVM: VMX: dynamise PLE window Radim Krčmář
2014-08-21 8:24 ` Paolo Bonzini
2014-08-21 11:47 ` Radim Krčmář
2014-08-21 8:26 ` Paolo Bonzini
2014-08-21 11:54 ` Radim Krčmář
2014-08-21 12:29 ` Paolo Bonzini
2014-08-21 12:42 ` Radim Krčmář
2014-08-21 13:18 ` Paolo Bonzini
2014-08-21 13:46 ` Radim Krčmář
2014-08-20 20:53 ` [PATCH v2 5/6] KVM: trace kvm_ple_window Radim Krčmář
2014-08-21 8:29 ` Paolo Bonzini
2014-08-21 11:56 ` Radim Krčmář
2014-08-21 13:22 ` Paolo Bonzini
2014-08-21 13:49 ` Radim Krčmář
2014-08-20 20:53 ` [PATCH v2 6/6] KVM: VMX: runtime knobs for dynamic PLE window Radim Krčmář
2014-08-21 6:49 ` [PATCH v2 0/6] Dynamic Pause Loop Exiting window Zhao, Hui-Zhi (Steven, HPservers-Core-OE-PSC)
2014-08-21 6:49 ` Zhao, Hui-Zhi (Steven, HPservers-Core-OE-PSC)
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