From: Simon Guo <wei.guo.simon@xxxxxxxxx>
This patch adds host emulation when guest PR KVM executes "trechkpt.",
which is a privileged instruction and will trap into host.
We firstly copy vcpu ongoing content into vcpu tm checkpoint
content, then perform kvmppc_restore_tm_pr() to do trechkpt.
with updated vcpu tm checkpoint vals.
Signed-off-by: Simon Guo <wei.guo.simon@xxxxxxxxx>
---
arch/powerpc/kvm/book3s_emulate.c | 57 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 56 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c
index 51c0e20..52a2e46 100644
--- a/arch/powerpc/kvm/book3s_emulate.c
+++ b/arch/powerpc/kvm/book3s_emulate.c
@@ -52,6 +52,7 @@
#define OP_31_XOP_TBEGIN 654
#define OP_31_XOP_TRECLAIM 942
+#define OP_31_XOP_TRCHKPT 1006
/* DCBZ is actually 1014, but we patch it to 1010 so we get a trap */
#define OP_31_XOP_DCBZ 1010
@@ -94,7 +95,7 @@ static bool spr_allowed(struct kvm_vcpu *vcpu, enum priv_level level)
}
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
-void kvmppc_copyto_vcpu_tm(struct kvm_vcpu *vcpu)
+static void kvmppc_copyto_vcpu_tm(struct kvm_vcpu *vcpu)
{
memcpy(&vcpu->arch.gpr_tm[0], &vcpu->arch.gpr[0],
sizeof(vcpu->arch.gpr_tm));
@@ -166,6 +167,32 @@ static void kvmppc_emulate_treclaim(struct kvm_vcpu *vcpu, int ra_val)
tm_disable();
preempt_enable();
}
+
+static void kvmppc_emulate_trchkpt(struct kvm_vcpu *vcpu)
+{
+ unsigned long guest_msr = kvmppc_get_msr(vcpu);
+
+ preempt_disable();
+ vcpu->arch.save_msr_tm = MSR_TS_S;
+ vcpu->arch.save_msr_tm &= ~(MSR_FP | MSR_VEC | MSR_VSX);
+ vcpu->arch.save_msr_tm |= (vcpu->arch.guest_owned_ext &
+ (MSR_FP | MSR_VEC | MSR_VSX));
+ /*
+ * need flush FP/VEC/VSX to vcpu save area before
+ * copy.
+ */
+ kvmppc_giveup_ext(vcpu, MSR_VSX);
+ kvmppc_copyto_vcpu_tm(vcpu);
+ kvmppc_restore_tm_pr(vcpu);
+ preempt_enable();
+
+ /*
+ * as a result of trecheckpoint. set TS to suspended.
+ */
+ guest_msr &= ~(MSR_TS_MASK);
+ guest_msr |= MSR_TS_S;
+ kvmppc_set_msr(vcpu, guest_msr);
+}
#endif
int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
@@ -457,6 +484,34 @@ int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
kvmppc_emulate_treclaim(vcpu, ra_val);
break;
}
+ case OP_31_XOP_TRCHKPT:
+ {
+ ulong guest_msr = kvmppc_get_msr(vcpu);
+ unsigned long texasr;
+
+ /* generate interrupt based on priorities */
+ if (guest_msr & MSR_PR) {
+ /* Privileged Instruction type Program Intr */
+ kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV);
+ emulated = EMULATE_AGAIN;
+ break;
+ }
+
+ tm_enable();
+ texasr = mfspr(SPRN_TEXASR);
+ tm_disable();
+
+ if (MSR_TM_ACTIVE(guest_msr) ||
+ !(texasr & (TEXASR_FS))) {
+ /* TM bad thing interrupt */
+ kvmppc_core_queue_program(vcpu, SRR1_PROGTM);
+ emulated = EMULATE_AGAIN;
+ break;
+ }
+
+ kvmppc_emulate_trchkpt(vcpu);
+ break;
+ }
#endif
default:
emulated = EMULATE_FAIL;
--
1.8.3.1
