From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751873AbaHSUhi (ORCPT ); Tue, 19 Aug 2014 16:37:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:23086 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751733AbaHSUhe (ORCPT ); Tue, 19 Aug 2014 16:37:34 -0400 From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Paolo Bonzini , Gleb Natapov , Raghavendra KT , Vinod Chegu , Hui-Zhi Subject: [PATCH 3/9] KVM: VMX: make PLE window per-vcpu Date: Tue, 19 Aug 2014 22:35:30 +0200 Message-Id: <1408480536-8240-4-git-send-email-rkrcmar@redhat.com> In-Reply-To: <1408480536-8240-1-git-send-email-rkrcmar@redhat.com> References: <1408480536-8240-1-git-send-email-rkrcmar@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- I've been thinking about a general hierarchical per-vcpu variable model, but it's hard to have current performance and sane code. arch/x86/kvm/vmx.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 2b306f9..eaa5574 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 { @@ -4403,6 +4406,7 @@ 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 +7391,9 @@ 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