From: Andrew Jones drjones@redhat.com
[ Upstream commit 811328fc3222f7b55846de0cd0404339e2e1e6d7 ]
A failed KVM_ARM_VCPU_INIT should not set the vcpu target, as the vcpu target is used by kvm_vcpu_initialized() to determine if other vcpu ioctls may proceed. We need to set the target before calling kvm_reset_vcpu(), but if that call fails, we should then unset it and clear the feature bitmap while we're at it.
Signed-off-by: Andrew Jones drjones@redhat.com [maz: Simplified patch, completed commit message] Signed-off-by: Marc Zyngier marc.zyngier@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm/kvm/arm.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index a670c70f4def9..dfc00a5bdc10d 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -801,7 +801,7 @@ int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, const struct kvm_vcpu_init *init) { - unsigned int i; + unsigned int i, ret; int phys_target = kvm_target_cpu();
if (init->target != phys_target) @@ -836,9 +836,14 @@ static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, vcpu->arch.target = phys_target;
/* Now we know what it is, we can reset it. */ - return kvm_reset_vcpu(vcpu); -} + ret = kvm_reset_vcpu(vcpu); + if (ret) { + vcpu->arch.target = -1; + bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); + }
+ return ret; +}
static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, struct kvm_vcpu_init *init)