linux-kernel - [PATCH] PPC: KVM: fix VCPU run for HV KVM

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Date:	Fri, 10 Jan 2014 18:21:07 +1100
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Paul Mackerras <paulus@...ba.org>,
	Alexander Graf <agraf@...e.de>, kvm-ppc@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: [PATCH] PPC: KVM: fix VCPU run for HV KVM

When write to MMIO happens and there is an ioeventfd for that and
is handled successfully, ioeventfd_write() returns 0 (success) and
kvmppc_handle_store() returns EMULATE_DONE. Then kvmppc_emulate_mmio()
converts EMULATE_DONE to RESUME_GUEST_NV and this broke from the loop.

This adds handling of RESUME_GUEST_NV in kvmppc_vcpu_run_hv().

Cc: Michael S. Tsirkin <mst@...hat.com>
Suggested-by: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
---

This definitely needs a better commit message. Please, help.
ps. it seems like ioeventfd never worked on ppc64. hm.

---
 arch/powerpc/kvm/book3s_hv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 072287f..24f363f 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1569,7 +1569,7 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
 				vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
 			srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
 		}
-	} while (r == RESUME_GUEST);
+	} while ((r == RESUME_GUEST_NV) || (r == RESUME_GUEST));
 
  out:
 	vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
-- 
1.8.4.rc4

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