When an SError arrives during single-step it may be delivered before the step completes. In that case the DBG_SPSR_SS bit will have flipped as the instruction executed. After handling the abort in handle_exit() we test to see if the bit is clear and we were single-stepping before deciding if we need to exit to user space. Signed-off-by: Alex Bennée <alex.bennee@xxxxxxxxxx> --- arch/arm64/kvm/handle_exit.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 3e645ec9e751..3ba8c4a3bcff 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -28,6 +28,7 @@ #include <asm/kvm_emulate.h> #include <asm/kvm_mmu.h> #include <asm/kvm_psci.h> +#include <asm/debug-monitors.h> #define CREATE_TRACE_POINTS #include "trace.h" @@ -250,7 +251,12 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, return 1; case ARM_EXCEPTION_EL1_SERROR: kvm_inject_vabt(vcpu); - return 1; + /* We may still need to return for single-step */ + if (!(*vcpu_cpsr(vcpu) & DBG_SPSR_SS) + && kvm_arm_handle_step_debug(vcpu, run)) + return 0; + else + return 1; case ARM_EXCEPTION_TRAP: return handle_trap_exceptions(vcpu, run); case ARM_EXCEPTION_HYP_GONE: -- 2.15.0
