@@ -138,6 +138,7 @@ static void kvmppc_emulate_treclaim(struct kvm_vcpu *vcpu, int ra_val)
{
unsigned long guest_msr = kvmppc_get_msr(vcpu);
int fc_val = ra_val ? ra_val : 1;
+ uint64_t texasr;
/* CR0 = 0 | MSR[TS] | 0 */
vcpu->arch.cr = (vcpu->arch.cr & ~(CR0_MASK << CR0_SHIFT)) |
@@ -145,25 +146,26 @@ static void kvmppc_emulate_treclaim(struct kvm_vcpu *vcpu, int ra_val)
<< CR0_SHIFT);
preempt_disable();
+ tm_enable();
+ texasr = mfspr(SPRN_TEXASR);
kvmppc_save_tm_pr(vcpu);
kvmppc_copyfrom_vcpu_tm(vcpu);
- tm_enable();
- vcpu->arch.texasr = mfspr(SPRN_TEXASR);
/* failure recording depends on Failure Summary bit */
- if (!(vcpu->arch.texasr & TEXASR_FS)) {
- vcpu->arch.texasr &= ~TEXASR_FC;
- vcpu->arch.texasr |= ((u64)fc_val << TEXASR_FC_LG);
+ if (!(texasr & TEXASR_FS)) {
+ texasr &= ~TEXASR_FC;
+ texasr |= ((u64)fc_val << TEXASR_FC_LG) | TEXASR_FS;
- vcpu->arch.texasr &= ~(TEXASR_PR | TEXASR_HV);
+ texasr &= ~(TEXASR_PR | TEXASR_HV);
if (kvmppc_get_msr(vcpu) & MSR_PR)
- vcpu->arch.texasr |= TEXASR_PR;
+ texasr |= TEXASR_PR;
if (kvmppc_get_msr(vcpu) & MSR_HV)
- vcpu->arch.texasr |= TEXASR_HV;
+ texasr |= TEXASR_HV;
+ vcpu->arch.texasr = texasr;
vcpu->arch.tfiar = kvmppc_get_pc(vcpu);
- mtspr(SPRN_TEXASR, vcpu->arch.texasr);
+ mtspr(SPRN_TEXASR, texasr);
mtspr(SPRN_TFIAR, vcpu->arch.tfiar);
}
tm_disable();
The treclaim. emulation needs to record failure status in the TEXASR register if the transaction had not previously failed. However, the current code first does kvmppc_save_tm_pr() (which does a treclaim. itself) and then checks the failure summary bit in TEXASR after that. Since treclaim. itself causes transaction failure, the FS bit is always set, so we were never updating TEXASR with the failure cause supplied by the guest as the RA parameter to the treclaim. instruction. This caused the tm-unavailable test in tools/testing/selftests/powerpc/tm to fail. To fix this, we need to read TEXASR before calling kvmppc_save_tm_pr(), and base the final value of TEXASR on that value. Fixes: 03c81682a90b ("KVM: PPC: Book3S PR: Add emulation for treclaim.") Signed-off-by: Paul Mackerras <paulus@ozlabs.org> --- This patch is against my kvm-ppc-next branch. arch/powerpc/kvm/book3s_emulate.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-)