[patch 09/62] KVM: SVM: fix suspend/resume support

[Greg KH]

2.6.26 -stable review patch.  If anyone has any objections, please let
us know.

------------------
From: Joerg Roedel <joerg.roedel@xxxxxxx>

Original-Commit-Hash: ab6267b708bec563891294488f2e854be404bdaf

On suspend the svm_hardware_disable function is called which frees all svm_data
variables. On resume they are not re-allocated. This patch removes the
deallocation of svm_data from the hardware_disable function to the
hardware_unsetup function which is not called on suspend.

Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>


---
 arch/x86/kvm/svm.c |   34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -270,19 +270,11 @@ static int has_svm(void)
 
 static void svm_hardware_disable(void *garbage)
 {
-	struct svm_cpu_data *svm_data
-		= per_cpu(svm_data, raw_smp_processor_id());
-
-	if (svm_data) {
-		uint64_t efer;
+	uint64_t efer;
 
-		wrmsrl(MSR_VM_HSAVE_PA, 0);
-		rdmsrl(MSR_EFER, efer);
-		wrmsrl(MSR_EFER, efer & ~MSR_EFER_SVME_MASK);
-		per_cpu(svm_data, raw_smp_processor_id()) = NULL;
-		__free_page(svm_data->save_area);
-		kfree(svm_data);
-	}
+	wrmsrl(MSR_VM_HSAVE_PA, 0);
+	rdmsrl(MSR_EFER, efer);
+	wrmsrl(MSR_EFER, efer & ~MSR_EFER_SVME_MASK);
 }
 
 static void svm_hardware_enable(void *garbage)
@@ -321,6 +313,19 @@ static void svm_hardware_enable(void *ga
 	       page_to_pfn(svm_data->save_area) << PAGE_SHIFT);
 }
 
+static void svm_cpu_uninit(int cpu)
+{
+	struct svm_cpu_data *svm_data
+		= per_cpu(svm_data, raw_smp_processor_id());
+
+	if (!svm_data)
+		return;
+
+	per_cpu(svm_data, raw_smp_processor_id()) = NULL;
+	__free_page(svm_data->save_area);
+	kfree(svm_data);
+}
+
 static int svm_cpu_init(int cpu)
 {
 	struct svm_cpu_data *svm_data;
@@ -458,6 +463,11 @@ err:
 
 static __exit void svm_hardware_unsetup(void)
 {
+	int cpu;
+
+	for_each_online_cpu(cpu)
+		svm_cpu_uninit(cpu);
+
 	__free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
 	iopm_base = 0;
 }

-- 
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