From a7653ecdf34c68a1af4fc085511afcf7ff011903 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Date: Thu, 21 Aug 2014 18:08:07 +0200 Subject: [PATCH] KVM: VMX: make PLE window per-VCPU MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 7c26533e149..70175990536 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -484,6 +484,10 @@ struct vcpu_vmx { /* Support for a guest hypervisor (nested VMX) */ struct nested_vmx nested; + + /* Dynamic PLE window. */ + int ple_window; + bool ple_window_dirty; }; enum segment_cache_field { @@ -4402,7 +4406,8 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) if (ple_gap) { vmcs_write32(PLE_GAP, ple_gap); - vmcs_write32(PLE_WINDOW, ple_window); + vmx->ple_window = ple_window; + vmx->ple_window_dirty = true; } vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0); @@ -7389,6 +7394,11 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) if (vmx->emulation_required) return; + if (vmx->ple_window_dirty) { + vmx->ple_window_dirty = false; + vmcs_write32(PLE_WINDOW, vmx->ple_window); + } + if (vmx->nested.sync_shadow_vmcs) { copy_vmcs12_to_shadow(vmx); vmx->nested.sync_shadow_vmcs = false; -- 2.46.0