[PATCH v4 08/29] KVM: PPC: Book3S PR: In PR KVM suspends Transactional state when inject an interrupt.

[wei.guo.simon at gmail.com]

From: Simon Guo <wei.guo.simon at gmail.com>

This patch simulates interrupt behavior per Power ISA while injecting
interrupt in PR KVM:
- When interrupt happens, transactional state should be suspended.

kvmppc_mmu_book3s_64_reset_msr() will be invoked when injecting an
interrupt. This patch performs this ISA logic in
kvmppc_mmu_book3s_64_reset_msr().

Signed-off-by: Simon Guo <wei.guo.simon at gmail.com>
Reviewed-by: Paul Mackerras <paulus at samba.org>
---
 arch/powerpc/kvm/book3s_64_mmu.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
index a93d719..cf9d686 100644
--- a/arch/powerpc/kvm/book3s_64_mmu.c
+++ b/arch/powerpc/kvm/book3s_64_mmu.c
@@ -38,7 +38,16 @@
 
 static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
 {
-	kvmppc_set_msr(vcpu, vcpu->arch.intr_msr);
+	unsigned long msr = vcpu->arch.intr_msr;
+	unsigned long cur_msr = kvmppc_get_msr(vcpu);
+
+	/* If transactional, change to suspend mode on IRQ delivery */
+	if (MSR_TM_TRANSACTIONAL(cur_msr))
+		msr |= MSR_TS_S;
+	else
+		msr |= cur_msr & MSR_TS_MASK;
+
+	kvmppc_set_msr(vcpu, msr);
 }
 
 static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
-- 
1.8.3.1