Interrupts masked by ICC_PMR_EL1 will not be signaled to the CPU. This
means that hypervisor will not receive masked interrupts while running a
guest.
Avoid this by making sure ICC_PMR_EL1 is unmasked when we enter a guest.
Signed-off-by: Julien Thierry <julien.thierry@xxxxxxx>
Cc: Christoffer Dall <christoffer.dall@xxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: kvmarm@xxxxxxxxxxxxxxxxxxxxx
---
arch/arm64/include/asm/kvm_host.h | 12 ++++++++++++
arch/arm64/kvm/hyp/switch.c | 17 +++++++++++++++++
2 files changed, 29 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 469de8a..bfd9e5b 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -24,6 +24,7 @@
#include <linux/types.h>
#include <linux/kvm_types.h>
+#include <asm/arch_gicv3.h>
#include <asm/cpufeature.h>
#include <asm/daifflags.h>
#include <asm/fpsimd.h>
@@ -433,6 +434,17 @@ static inline void kvm_fpsimd_flush_cpu_state(void)
static inline void kvm_arm_vhe_guest_enter(void)
{
local_daif_mask();
+
+ /*
+ * Having IRQs masked via PMR when entering the guest means the GIC
+ * will not signal the CPU of interrupts of lower priority, and the
+ * only way to get out will be via guest exceptions.
+ * Naturally, we want to avoid this.
+ */
+ if (gic_prio_masking_enabled()) {
+ gic_write_pmr(ICC_PMR_EL1_UNMASKED);
+ dsb(sy);
+ }
}
static inline void kvm_arm_vhe_guest_exit(void)
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index d964523..f00a04c 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -21,6 +21,7 @@
#include <kvm/arm_psci.h>
+#include <asm/arch_gicv3.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
@@ -442,6 +443,19 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
struct kvm_cpu_context *guest_ctxt;
bool fp_enabled;
u64 exit_code;
+ u32 host_pmr = ICC_PMR_EL1_UNMASKED;
+
+ /*
+ * Having IRQs masked via PMR when entering the guest means the GIC
+ * will not signal the CPU of interrupts of lower priority, and the
+ * only way to get out will be via guest exceptions.
+ * Naturally, we want to avoid this.
+ */
+ if (gic_prio_masking_enabled()) {
+ host_pmr = gic_read_pmr();
+ gic_write_pmr(ICC_PMR_EL1_UNMASKED);
+ dsb(sy);
+ }
vcpu = kern_hyp_va(vcpu);
@@ -496,6 +510,9 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
*/
__debug_switch_to_host(vcpu);
+ if (gic_prio_masking_enabled())
+ gic_write_pmr(host_pmr);
+
return exit_code;
}
--
1.9.1
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