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Date:   Thu,  9 Nov 2017 17:00:21 +0000
From:   Alex Bennée <>
Cc:     Alex Bennée <>, (open list)
Subject: [PATCH v2 3/3] kvm: arm64: handle single-step of userspace mmio instructions

The system state of KVM when using userspace emulation is not complete
until we return into KVM_RUN. To handle mmio related updates we wait
until they have been committed and then schedule our KVM_EXIT_DEBUG.

The kvm_arm_handle_step_debug() helper tells us if we need to return
and sets up the exit_reason for us.

Signed-off-by: Alex Bennée <>

  - call helper directly from kvm_arch_vcpu_ioctl_run
 virt/kvm/arm/arm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 95cba0799828..2991adfaca9d 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -625,6 +625,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 		ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 		if (ret)
 			return ret;
+		if (kvm_arm_handle_step_debug(vcpu, vcpu->run))
+			return 1;
 	if (run->immediate_exit)

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