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KVM: PPC: Book3S PR: Expose TM registers

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POWER8 introduces transactional memory which brings along a number of new
registers and MSR bits.

Implementing all of those is a pretty big headache, so for now let's at least
emulate enough to make Linux's context switching code happy.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2014-04-29 17:54:40 +02:00
parent 2e23f54413
commit 9916d57e64
2 changed files with 41 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

22
arch/powerpc/kvm/book3s_emulate.c
View file

@ -451,6 +451,17 @@ int kvmppc_core_emulate_mtspr_pr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
case SPRN_EBBRR:
vcpu->arch.ebbrr = spr_val;
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case SPRN_TFHAR:
vcpu->arch.tfhar = spr_val;
break;
case SPRN_TEXASR:
vcpu->arch.texasr = spr_val;
break;
case SPRN_TFIAR:
vcpu->arch.tfiar = spr_val;
break;
#endif
#endif
case SPRN_ICTC:
case SPRN_THRM1:
@ -572,6 +583,17 @@ int kvmppc_core_emulate_mfspr_pr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val
case SPRN_EBBRR:
*spr_val = vcpu->arch.ebbrr;
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case SPRN_TFHAR:
*spr_val = vcpu->arch.tfhar;
break;
case SPRN_TEXASR:
*spr_val = vcpu->arch.texasr;
break;
case SPRN_TFIAR:
*spr_val = vcpu->arch.tfiar;
break;
#endif
#endif
case SPRN_THRM1:
case SPRN_THRM2:

20
arch/powerpc/kvm/book3s_pr.c
View file

@ -794,9 +794,27 @@ static void kvmppc_emulate_fac(struct kvm_vcpu *vcpu, ulong fac)
/* Enable facilities (TAR, EBB, DSCR) for the guest */
static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac)
{
bool guest_fac_enabled;
BUG_ON(!cpu_has_feature(CPU_FTR_ARCH_207S));
if (!(vcpu->arch.fscr & (1ULL << fac))) {
/*
* Not every facility is enabled by FSCR bits, check whether the
* guest has this facility enabled at all.
*/
switch (fac) {
case FSCR_TAR_LG:
case FSCR_EBB_LG:
guest_fac_enabled = (vcpu->arch.fscr & (1ULL << fac));
break;
case FSCR_TM_LG:
guest_fac_enabled = kvmppc_get_msr(vcpu) & MSR_TM;
break;
default:
guest_fac_enabled = false;
break;
}
if (!guest_fac_enabled) {
/* Facility not enabled by the guest */
kvmppc_trigger_fac_interrupt(vcpu, fac);
return RESUME_GUEST;