KVM: SVM: Fix schedule-while-atomic on nested exception handling

Move the actual vmexit routine out of code that runs with
irqs and preemption disabled.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index f9da35b..c27da0a 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -129,6 +129,7 @@ static void svm_flush_tlb(struct kvm_vcpu *vcpu);
 static void svm_complete_interrupts(struct vcpu_svm *svm);
 
 static int nested_svm_exit_handled(struct vcpu_svm *svm);
+static int nested_svm_intercept(struct vcpu_svm *svm);
 static int nested_svm_vmexit(struct vcpu_svm *svm);
 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
                                      bool has_error_code, u32 error_code);
@@ -1384,6 +1385,8 @@ static int nested_svm_check_permissions(struct vcpu_svm *svm)
 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
                                      bool has_error_code, u32 error_code)
 {
+       int vmexit;
+
        if (!is_nested(svm))
                return 0;
 
@@ -1392,7 +1395,11 @@ static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
        svm->vmcb->control.exit_info_1 = error_code;
        svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
 
-       return nested_svm_exit_handled(svm);
+       vmexit = nested_svm_intercept(svm);
+       if (vmexit == NESTED_EXIT_DONE)
+               svm->nested.exit_required = true;
+
+       return vmexit;
 }
 
 static inline int nested_svm_intr(struct vcpu_svm *svm)
@@ -1521,7 +1528,7 @@ static int nested_svm_exit_special(struct vcpu_svm *svm)
 /*
  * If this function returns true, this #vmexit was already handled
  */
-static int nested_svm_exit_handled(struct vcpu_svm *svm)
+static int nested_svm_intercept(struct vcpu_svm *svm)
 {
        u32 exit_code = svm->vmcb->control.exit_code;
        int vmexit = NESTED_EXIT_HOST;
@@ -1567,9 +1574,17 @@ static int nested_svm_exit_handled(struct vcpu_svm *svm)
        }
        }
 
-       if (vmexit == NESTED_EXIT_DONE) {
+       return vmexit;
+}
+
+static int nested_svm_exit_handled(struct vcpu_svm *svm)
+{
+       int vmexit;
+
+       vmexit = nested_svm_intercept(svm);
+
+       if (vmexit == NESTED_EXIT_DONE)
                nested_svm_vmexit(svm);
-       }
 
        return vmexit;
 }