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From: "Joerg Roedel" <joerg.roedel@amd.com>
To: "Avi Kivity" <avi@qumranet.com>,
	kvm-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org
Cc: "Joerg Roedel" <joerg.roedel@amd.com>
Subject: [PATCH 3/8] SVM: add module parameter to disable Nested Paging
Date: Fri, 25 Jan 2008 21:53:08 +0100	[thread overview]
Message-ID: <1201294393-22613-4-git-send-email-joerg.roedel@amd.com> (raw)
In-Reply-To: <1201294393-22613-1-git-send-email-joerg.roedel@amd.com>

To disable the use of the Nested Paging feature even if it is available in
hardware this patch adds a module parameter. Nested Paging can be disabled by
passing npt=off to the kvm_amd module.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/kvm/svm.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 49bb57a..2e718ff 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -48,6 +48,9 @@ MODULE_LICENSE("GPL");
 #define SVM_DEATURE_SVML (1 << 2)
 
 static bool npt_enabled = false;
+static char *npt = "on";
+
+module_param(npt, charp, S_IRUGO);
 
 static void kvm_reput_irq(struct vcpu_svm *svm);
 
@@ -415,6 +418,11 @@ static __init int svm_hardware_setup(void)
 	if (!svm_has(SVM_FEATURE_NPT))
 		npt_enabled = false;
 
+	if (npt_enabled && strncmp(npt, "off", 3) == 0) {
+		printk(KERN_INFO "kvm: Nested Paging disabled\n");
+		npt_enabled = false;
+	}
+
 	if (npt_enabled)
 		printk(KERN_INFO "kvm: Nested Paging enabled\n");
 
-- 
1.5.3.7




  parent reply	other threads:[~2008-01-25 20:54 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-25 20:53 [PATCH][RFC] SVM: Add Support for Nested Paging in AMD Fam16 CPUs Joerg Roedel
2008-01-25 20:53 ` [PATCH 1/8] SVM: move feature detection to hardware setup code Joerg Roedel
2008-01-25 20:53 ` [PATCH 2/8] SVM: add detection of Nested Paging feature Joerg Roedel
2008-01-25 20:53 ` Joerg Roedel [this message]
2008-01-25 21:35   ` [kvm-devel] [PATCH 3/8] SVM: add module parameter to disable Nested Paging Anthony Liguori
2008-01-25 22:10     ` Joerg Roedel
2008-01-26 18:38       ` Avi Kivity
2008-01-26  1:47   ` [kvm-devel] [PATCH 3/8] SVM: add module parameter to disable NestedPaging Nakajima, Jun
2008-01-26  7:25     ` Joerg Roedel
2008-01-26  9:49       ` Alexey Eremenko
2008-01-26 10:06         ` Joerg Roedel
2008-01-26 16:36         ` Anthony Liguori
2008-01-26 18:23       ` Avi Kivity
2008-01-25 20:53 ` [PATCH 4/8] X86: export information about NPT to generic x86 code Joerg Roedel
2008-01-25 21:37   ` [kvm-devel] " Anthony Liguori
2008-01-25 21:40     ` Anthony Liguori
2008-01-27  8:40   ` Avi Kivity
2008-01-25 20:53 ` [PATCH 5/8] MMU: make the __nonpaging_map function generic Joerg Roedel
2008-01-25 20:53 ` [PATCH 6/8] X86: export the load_pdptrs() function to modules Joerg Roedel
2008-01-25 20:53 ` [PATCH 7/8] MMU: add HAP support to the KVM MMU Joerg Roedel
2008-01-25 20:53 ` [PATCH 8/8] SVM: add support for Nested Paging Joerg Roedel
2008-01-27  8:52   ` [kvm-devel] " Avi Kivity
2008-01-27  9:41     ` Joerg Roedel
2008-01-27  9:51       ` Avi Kivity
2008-01-27 10:05         ` Joerg Roedel
2008-01-27 10:24           ` Avi Kivity
2008-01-25 21:32 ` [kvm-devel] [PATCH][RFC] SVM: Add Support for Nested Paging in AMD Fam16 CPUs Anthony Liguori
2008-01-25 22:47   ` Joerg Roedel
2008-01-26  1:57 ` Nakajima, Jun
2008-01-27  8:57 ` Avi Kivity
2008-01-27  9:51   ` Joerg Roedel
2008-01-28  3:20   ` Jeremy Fitzhardinge
2008-01-28 11:08     ` Avi Kivity
2008-02-07 12:09   ` Joerg Roedel
2008-02-10 10:35     ` Avi Kivity
2008-02-07 12:47 KVM: add support for SVM Nested Paging Joerg Roedel
2008-02-07 12:47 ` [PATCH 3/8] SVM: add module parameter to disable " Joerg Roedel

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