linux-kernel - [PATCH 13/15] kvm: svm: register virt_disable function on hardware

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1225915018-6548-14-git-send-email-ehabkost@redhat.com>
Date:	Wed,  5 Nov 2008 17:56:56 -0200
From:	Eduardo Habkost <ehabkost@...hat.com>
To:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Simon Horman <horms@...ge.net.au>,
	Andrew Morton <akpm@...l.org>, Vivek Goyal <vgoyal@...hat.com>,
	Haren Myneni <hbabu@...ibm.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>, mingo@...hat.com,
	"Rafael J. Wysocki" <rjw@...k.pl>, kexec@...ts.infradead.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Eduardo Habkost <ehabkost@...hat.com>
Subject: [PATCH 13/15] kvm: svm: register virt_disable function on hardware_setup

Call set_virt_disable_func() on hardware_setup, and clear it on
hardware_unsetup.

This way kdump and reboot code will be able to disable svm when needed.

Signed-off-by: Eduardo Habkost <ehabkost@...hat.com>
---
 arch/x86/kvm/svm.c |   19 +++++++++++++++----
 1 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 3d330a2..8f9256d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -27,6 +27,7 @@
 #include <linux/sched.h>
 
 #include <asm/desc.h>
+#include <asm/virtext.h>
 
 #define __ex(x) __kvm_handle_fault_on_reboot(x)
 
@@ -422,10 +423,16 @@ static __init int svm_hardware_setup(void)
 	void *iopm_va;
 	int r;
 
+	r = set_virt_disable_func(__svm_hardware_disable);
+	if (r)
+		goto err;
+
 	iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);
 
-	if (!iopm_pages)
-		return -ENOMEM;
+	if (!iopm_pages) {
+		r = -ENOMEM;
+		goto err_clear_virt_disable;
+	}
 
 	iopm_va = page_address(iopm_pages);
 	memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
@@ -438,7 +445,7 @@ static __init int svm_hardware_setup(void)
 	for_each_online_cpu(cpu) {
 		r = svm_cpu_init(cpu);
 		if (r)
-			goto err;
+			goto err_free_iopm;
 	}
 
 	svm_features = cpuid_edx(SVM_CPUID_FUNC);
@@ -459,9 +466,12 @@ static __init int svm_hardware_setup(void)
 
 	return 0;
 
-err:
+err_free_iopm:
 	__free_pages(iopm_pages, IOPM_ALLOC_ORDER);
 	iopm_base = 0;
+err_clear_virt_disable:
+	clear_virt_disable_func();
+err:
 	return r;
 }
 
@@ -474,6 +484,7 @@ static __exit void svm_hardware_unsetup(void)
 
 	__free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
 	iopm_base = 0;
+	clear_virt_disable_func();
 }
 
 static void init_seg(struct vmcb_seg *seg)
-- 
1.5.5.GIT

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/