Commit b8e88bc8 authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

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: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 7597f129

arch/x86/kvm/svm.c

+19 −4
Original line number Diff line number Diff line
@@ -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;
@@ -1567,10 +1574,18 @@ static int nested_svm_exit_handled(struct vcpu_svm *svm) 
	}

	}



	if (vmexit == NESTED_EXIT_DONE) {

		nested_svm_vmexit(svm);

	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;

}