From 401a89e9375c011de4e3271d50f27648b734a7cb Mon Sep 17 00:00:00 2001 From: Simon Guo Date: Wed, 23 May 2018 15:01:54 +0800 Subject: [PATCH] KVM: PPC: Book3S PR: Implement RFID TM behavior to suppress change from S0 to N0 According to ISA specification for RFID, in MSR TM disabled and TS suspended state (S0), if the target MSR is TM disabled and TS state is inactive (N0), rfid should suppress this update. This patch makes the RFID emulation of PR KVM consistent with this. Signed-off-by: Simon Guo Signed-off-by: Paul Mackerras --- arch/powerpc/kvm/book3s_emulate.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c index 68d6898..2eb457b 100644 --- a/arch/powerpc/kvm/book3s_emulate.c +++ b/arch/powerpc/kvm/book3s_emulate.c @@ -117,11 +117,28 @@ int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu, case 19: switch (get_xop(inst)) { case OP_19_XOP_RFID: - case OP_19_XOP_RFI: + case OP_19_XOP_RFI: { + unsigned long srr1 = kvmppc_get_srr1(vcpu); +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + unsigned long cur_msr = kvmppc_get_msr(vcpu); + + /* + * add rules to fit in ISA specification regarding TM + * state transistion in TM disable/Suspended state, + * and target TM state is TM inactive(00) state. (the + * change should be suppressed). + */ + if (((cur_msr & MSR_TM) == 0) && + ((srr1 & MSR_TM) == 0) && + MSR_TM_SUSPENDED(cur_msr) && + !MSR_TM_ACTIVE(srr1)) + srr1 |= MSR_TS_S; +#endif kvmppc_set_pc(vcpu, kvmppc_get_srr0(vcpu)); - kvmppc_set_msr(vcpu, kvmppc_get_srr1(vcpu)); + kvmppc_set_msr(vcpu, srr1); *advance = 0; break; + } default: emulated = EMULATE_FAIL; -- 2.7.4