From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759711AbYAFOpy (ORCPT ); Sun, 6 Jan 2008 09:45:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758422AbYAFOkE (ORCPT ); Sun, 6 Jan 2008 09:40:04 -0500 Received: from il.qumranet.com ([82.166.9.18]:46606 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755907AbYAFOjr (ORCPT ); Sun, 6 Jan 2008 09:39:47 -0500 From: Avi Kivity To: linux-kernel@vger.kernel.org, kvm-devel@lists.sourceforge.net Cc: Eddie Dong Subject: [PATCH 21/33] KVM: MMU: Coalesce remote tlb flushes Date: Sun, 6 Jan 2008 16:39:27 +0200 Message-Id: <1199630379-28638-22-git-send-email-avi@qumranet.com> X-Mailer: git-send-email 1.5.3.7 In-Reply-To: <1199630379-28638-1-git-send-email-avi@qumranet.com> References: <1199630379-28638-1-git-send-email-avi@qumranet.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eddie Dong Host side TLB flush can be merged together if multiple spte need to be write-protected. Signed-off-by: Yaozu (Eddie) Dong Signed-off-by: Avi Kivity --- arch/x86/kvm/mmu.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 401eb7c..9a57e1a 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -513,6 +513,7 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn) { unsigned long *rmapp; u64 *spte; + int write_protected = 0; gfn = unalias_gfn(kvm, gfn); rmapp = gfn_to_rmap(kvm, gfn); @@ -522,11 +523,14 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn) BUG_ON(!spte); BUG_ON(!(*spte & PT_PRESENT_MASK)); rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); - if (is_writeble_pte(*spte)) + if (is_writeble_pte(*spte)) { set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK); - kvm_flush_remote_tlbs(kvm); + write_protected = 1; + } spte = rmap_next(kvm, rmapp, spte); } + if (write_protected) + kvm_flush_remote_tlbs(kvm); } #ifdef MMU_DEBUG -- 1.5.3.7