Update the guest_debug flags from userspace accordingly.
Route the breakpoint exceptions to HS mode if the VM is being debugged
by userspace, by clearing the corresponding bit in hedeleg CSR.
Signed-off-by: Chao Du <duchao@xxxxxxxxxxxxxxxxxx>
---
arch/riscv/kvm/vcpu.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index e087c809073c..b8144434ff23 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -473,8 +473,19 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg)
{
- /* TODO; To be implemented later. */
- return -EINVAL;
+ if (dbg->control & KVM_GUESTDBG_ENABLE) {
+ if (vcpu->guest_debug != dbg->control) {
+ vcpu->guest_debug = dbg->control;
+ csr_clear(CSR_HEDELEG, BIT(EXC_BREAKPOINT));
+ }
+ } else {
+ if (vcpu->guest_debug != 0) {
+ vcpu->guest_debug = 0;
+ csr_set(CSR_HEDELEG, BIT(EXC_BREAKPOINT));
+ }
+ }
+
+ return 0;
}
static void kvm_riscv_vcpu_setup_config(struct kvm_vcpu *vcpu)
--
2.17.1
