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authorChristoffer Dall <christoffer.dall@linaro.org>2014-10-16 17:21:16 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-07-03 19:49:06 -0700
commitd6f5e8769d9bc6c7ec58669c940537cca63e0b73 (patch)
tree027a9de0426411b1f8cf13b4e863e26df198e38c
parent97110822ab73a02e9174779b5f5c5e63a468c1d3 (diff)
arm/arm64: KVM: Reset the HCR on each vcpu when resetting the vcpu
commit b856a59141b1066d3c896a0d0231f84dabd040af upstream. 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> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/arm/include/asm/kvm_emulate.h5
-rw-r--r--arch/arm/kvm/arm.c2
-rw-r--r--arch/arm/kvm/guest.c1
-rw-r--r--arch/arm64/include/asm/kvm_emulate.h5
-rw-r--r--arch/arm64/kvm/guest.c1
5 files changed, 12 insertions, 2 deletions
diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h
index 0fa90c962ac8..853e2becad18 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 9c58125ba2d7..077f82d04086 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -675,6 +675,8 @@ 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 b23a59c1c522..2786eae10c0d 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;
}
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index dd8ecfc3f995..681cb9080100 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -38,6 +38,11 @@ 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_el2 = HCR_GUEST_FLAGS;
+}
+
static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
{
return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc;
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 08745578d54d..a8d81fa8c527 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/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_el2 = HCR_GUEST_FLAGS;
return 0;
}