linux-kernel - [PATCH] KVM: mmu: honor global bit on huge pages

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Message-Id: <20061204145735.89391A0016@il.qumranet.com>
Date:	Mon, 04 Dec 2006 14:57:35 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	akpm@...l.org, mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: mmu: honor global bit on huge pages

The kvm mmu attempts to cache global translations, however it misses on
global huge page translation (which is what most global pages are).

By caching global huge page translations, boot time of fc5 i386 on i386
is reduced from ~35 seconds to ~24 seconds.

Signed-off-by: Avi Kivity <avi@...ranet.com>

Index: linux-2.6/drivers/kvm/paging_tmpl.h
===================================================================
--- linux-2.6.orig/drivers/kvm/paging_tmpl.h
+++ linux-2.6/drivers/kvm/paging_tmpl.h
@@ -105,7 +105,7 @@ static void FNAME(set_pde)(struct kvm_vc
 	if (PTTYPE == 32 && is_cpuid_PSE36())
 		gaddr |= (guest_pde & PT32_DIR_PSE36_MASK) <<
 			(32 - PT32_DIR_PSE36_SHIFT);
-	*shadow_pte = (guest_pde & PT_NON_PTE_COPY_MASK) |
+	*shadow_pte = (guest_pde & (PT_NON_PTE_COPY_MASK | PT_GLOBAL_MASK)) |
 		          ((guest_pde & PT_DIR_PAT_MASK) >>
 			            (PT_DIR_PAT_SHIFT - PT_PAT_SHIFT));
 	set_pte_common(vcpu, shadow_pte, gaddr,
-
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