path: root/arch/arm
diff options
authorChristoffer Dall <christoffer.dall@linaro.org>2014-10-16 17:21:16 +0200
committerChristoffer Dall <christoffer.dall@linaro.org>2014-12-13 14:15:26 +0100
commitb856a59141b1066d3c896a0d0231f84dabd040af (patch)
treeaf889ac7fce03290fd3c086bcb64471ec81689cb /arch/arm
parentarm/arm64: KVM: Correct KVM_ARM_VCPU_INIT power off option (diff)
arm/arm64: KVM: Reset the HCR on each vcpu when resetting the vcpu
When userspace resets the vcpu using KVM_ARM_VCPU_INIT, we should also reset the HCR, because we now modify the HCR dynamically to enable/disable trapping of guest accesses to the VM registers. This is crucial for reboot of VMs working since otherwise we will not be doing the necessary cache maintenance operations when faulting in pages with the guest MMU off. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm')
3 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h
index b9db269c6e61..66ce17655bb9 100644
--- a/arch/arm/include/asm/kvm_emulate.h
+++ b/arch/arm/include/asm/kvm_emulate.h
@@ -33,6 +33,11 @@ void kvm_inject_undefined(struct kvm_vcpu *vcpu);
void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
+static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
+ vcpu->arch.hcr = HCR_GUEST_MASK;
static inline bool vcpu_mode_is_32bit(struct kvm_vcpu *vcpu)
return 1;
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index edc196412abe..24c9ca4076b2 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -658,6 +658,8 @@ static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
if (ret)
return ret;
+ vcpu_reset_hcr(vcpu);
* Handle the "start in power-off" case by marking the VCPU as paused.
diff --git a/arch/arm/kvm/guest.c b/arch/arm/kvm/guest.c
index cc0b78769bd8..8c97208b9b97 100644
--- a/arch/arm/kvm/guest.c
+++ b/arch/arm/kvm/guest.c
@@ -38,7 +38,6 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
- vcpu->arch.hcr = HCR_GUEST_MASK;
return 0;