From f61e0d3cc4aee194014074471658a5a037e311ce Mon Sep 17 00:00:00 2001 From: Simon Guo Date: Fri, 8 Jun 2018 01:40:03 -0400 Subject: [PATCH] KVM: PPC: Book3S PR: Fix failure status setting in tabort. emulation tabort. will perform transaction failure recording and the recording depends on TEXASR FS bit. Currently the TEXASR FS bit is retrieved after tabort., when the TEXASR FS bit is already been updated by tabort. itself. This patch corrects this behavior by retrieving TEXASR val before tabort. tabort. will not immediately leads to transaction failure handling in suspend state. So this patch also remove the mtspr on TEXASR/TFIAR registers to avoid TM bad thing exception. Fixes: 26798f88d58d ("KVM: PPC: Book3S PR: Add emulation for tabort. in privileged state") Signed-off-by: Simon Guo Signed-off-by: Paul Mackerras --- arch/powerpc/kvm/book3s_emulate.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c index 05cac5ea79c5..36b11c5a0dbb 100644 --- a/arch/powerpc/kvm/book3s_emulate.c +++ b/arch/powerpc/kvm/book3s_emulate.c @@ -212,9 +212,11 @@ void kvmppc_emulate_tabort(struct kvm_vcpu *vcpu, int ra_val) * present. */ unsigned long guest_msr = kvmppc_get_msr(vcpu); + uint64_t org_texasr; preempt_disable(); tm_enable(); + org_texasr = mfspr(SPRN_TEXASR); tm_abort(ra_val); /* CR0 = 0 | MSR[TS] | 0 */ @@ -227,7 +229,7 @@ void kvmppc_emulate_tabort(struct kvm_vcpu *vcpu, int ra_val) * and tabort will be treated as nops in non-transactional * state. */ - if (!(vcpu->arch.texasr & TEXASR_FS) && + if (!(org_texasr & TEXASR_FS) && MSR_TM_ACTIVE(guest_msr)) { vcpu->arch.texasr &= ~(TEXASR_PR | TEXASR_HV); if (guest_msr & MSR_PR) @@ -237,8 +239,6 @@ void kvmppc_emulate_tabort(struct kvm_vcpu *vcpu, int ra_val) vcpu->arch.texasr |= TEXASR_HV; vcpu->arch.tfiar = kvmppc_get_pc(vcpu); - mtspr(SPRN_TEXASR, vcpu->arch.texasr); - mtspr(SPRN_TFIAR, vcpu->arch.tfiar); } tm_disable(); preempt_enable();