[PATCH 13/15] kvm: svm: register virt_disable function on hardware_setup

[ehabkost@xxxxxxxxxx (Eduardo Habkost)]

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 at redhat.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