| Message ID | 1407307137-5083-5-git-send-email-Bharat.Bhushan@freescale.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 322da7d..b4ab86c 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -735,6 +735,8 @@ static int kvmppc_handle_debug(struct kvm_run *run, struct kvm_vcpu *vcpu) struct debug_reg *dbg_reg = &(vcpu->arch.shadow_dbg_reg); u32 dbsr = vcpu->arch.dbsr; + /* Clear guest dbsr (vcpu->arch.dbsr) */ + vcpu->arch.dbsr = 0; run->debug.arch.status = 0; run->debug.arch.address = vcpu->arch.pc;
Dbsr is not visible to userspace and we do not think any need to expose this to userspace because: Userspace cannot inject debug interrupt to guest (as this does not know guest ability to handle debug interrupt), so userspace will always clear DBSR. Now if userspace has to always clear DBSR in KVM_EXIT_DEBUG handling then clearing dbsr in kernel looks simple as this avoid doing SET_SREGS/set_one_reg() to clear DBSR Signed-off-by: Bharat Bhushan <Bharat.Bhushan@freescale.com> --- v2->v3 - Small comment in code, patch description have sufficient detail arch/powerpc/kvm/booke.c | 2 ++ 1 file changed, 2 insertions(+)