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KVM: PPC: Implement BAT reads 

BATs can't only be written to, you can also read them out!
So let's implement emulation for reading BAT values again.

While at it, I also made BAT setting flush the segment cache,
so we're absolutely sure there's no MMU state left when writing
BATs.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2010-03-24 21:48:25 +01:00 committed by Avi Kivity
parent c664876c6d
commit c04a695a44
1 changed files with 35 additions and 0 deletions
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35
arch/powerpc/kvm/book3s_64_emulate.c
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@ -239,6 +239,34 @@ void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat, bool upper,
}
}
static u32 kvmppc_read_bat(struct kvm_vcpu *vcpu, int sprn)
{
struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
struct kvmppc_bat *bat;
switch (sprn) {
case SPRN_IBAT0U ... SPRN_IBAT3L:
bat = &vcpu_book3s->ibat[(sprn - SPRN_IBAT0U) / 2];
break;
case SPRN_IBAT4U ... SPRN_IBAT7L:
bat = &vcpu_book3s->ibat[4 + ((sprn - SPRN_IBAT4U) / 2)];
break;
case SPRN_DBAT0U ... SPRN_DBAT3L:
bat = &vcpu_book3s->dbat[(sprn - SPRN_DBAT0U) / 2];
break;
case SPRN_DBAT4U ... SPRN_DBAT7L:
bat = &vcpu_book3s->dbat[4 + ((sprn - SPRN_DBAT4U) / 2)];
break;
default:
BUG();
}
if (sprn % 2)
return bat->raw >> 32;
else
return bat->raw;
}
static void kvmppc_write_bat(struct kvm_vcpu *vcpu, int sprn, u32 val)
{
struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
@ -290,6 +318,7 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
/* BAT writes happen so rarely that we're ok to flush
* everything here */
kvmppc_mmu_pte_flush(vcpu, 0, 0);
kvmppc_mmu_flush_segments(vcpu);
break;
case SPRN_HID0:
to_book3s(vcpu)->hid[0] = spr_val;
@ -373,6 +402,12 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
int emulated = EMULATE_DONE;
switch (sprn) {
case SPRN_IBAT0U ... SPRN_IBAT3L:
case SPRN_IBAT4U ... SPRN_IBAT7L:
case SPRN_DBAT0U ... SPRN_DBAT3L:
case SPRN_DBAT4U ... SPRN_DBAT7L:
kvmppc_set_gpr(vcpu, rt, kvmppc_read_bat(vcpu, sprn));
break;
case SPRN_SDR1:
kvmppc_set_gpr(vcpu, rt, to_book3s(vcpu)->sdr1);
break;