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powerpc/kvm: Fix VSID usage in 64-bit "PR" KVM 

The code forgot to scramble the VSIDs the way we normally do
and was basically using the "proto VSID" directly with the MMU.

This means that in practice, KVM used random VSIDs that could
collide with segments used by other user space programs.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[agraf: simplify ppc32 case]
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Benjamin Herrenschmidt 2012-03-23 11:21:14 +11:00 committed by Alexander Graf
parent 32c7dbfd47
commit ffe3649282
2 changed files with 11 additions and 9 deletions
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7
arch/powerpc/include/asm/kvm_book3s.h
View File

@ -81,12 +81,13 @@ struct kvmppc_vcpu_book3s {
u64 sdr1;
u64 hior;
u64 msr_mask;
u64 vsid_next;
#ifdef CONFIG_PPC_BOOK3S_32
u32 vsid_pool[VSID_POOL_SIZE];
u32 vsid_next;
#else
u64 vsid_first;
u64 vsid_max;
u64 proto_vsid_first;
u64 proto_vsid_max;
u64 proto_vsid_next;
#endif
int context_id[SID_CONTEXTS];

13
arch/powerpc/kvm/book3s_64_mmu_host.c
View File

@ -194,14 +194,14 @@ static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
backwards_map = !backwards_map;
/* Uh-oh ... out of mappings. Let's flush! */
if (vcpu_book3s->vsid_next == vcpu_book3s->vsid_max) {
vcpu_book3s->vsid_next = vcpu_book3s->vsid_first;
if (vcpu_book3s->proto_vsid_next == vcpu_book3s->proto_vsid_max) {
vcpu_book3s->proto_vsid_next = vcpu_book3s->proto_vsid_first;
memset(vcpu_book3s->sid_map, 0,
sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
kvmppc_mmu_pte_flush(vcpu, 0, 0);
kvmppc_mmu_flush_segments(vcpu);
}
map->host_vsid = vcpu_book3s->vsid_next++;
map->host_vsid = vsid_scramble(vcpu_book3s->proto_vsid_next++, 256M);
map->guest_vsid = gvsid;
map->valid = true;
@ -319,9 +319,10 @@ int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
return -1;
vcpu3s->context_id[0] = err;
vcpu3s->vsid_max = ((vcpu3s->context_id[0] + 1) << USER_ESID_BITS) - 1;
vcpu3s->vsid_first = vcpu3s->context_id[0] << USER_ESID_BITS;
vcpu3s->vsid_next = vcpu3s->vsid_first;
vcpu3s->proto_vsid_max = ((vcpu3s->context_id[0] + 1)
<< USER_ESID_BITS) - 1;
vcpu3s->proto_vsid_first = vcpu3s->context_id[0] << USER_ESID_BITS;
vcpu3s->proto_vsid_next = vcpu3s->proto_vsid_first;
kvmppc_mmu_hpte_init(vcpu);