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KVM: PPC: Book3S HV: Disable HPT resizing on POWER9 for now

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The new HPT resizing code added in commit b5baa68773 ("KVM: PPC:
Book3S HV: KVM-HV HPT resizing implementation", 2016-12-20) doesn't
have code to handle the new HPTE format which POWER9 uses.  Thus it
would be best not to advertise it to userspace on POWER9 systems
until it works properly.

Also, since resize_hpt_rehash_hpte() contains BUG_ON() calls that
could be hit on POWER9, let's prevent it from being called on POWER9
for now.

Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras 2017-02-18 08:30:44 +11:00
parent 3a4f176081
commit bcd3bb63db
2 changed files with 8 additions and 1 deletions
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6
arch/powerpc/kvm/book3s_64_mmu_hv.c
View file

@ -1370,6 +1370,12 @@ static int resize_hpt_rehash(struct kvm_resize_hpt *resize)
unsigned long i;
int rc;
/*
* resize_hpt_rehash_hpte() doesn't handle the new-format HPTEs
* that POWER9 uses, and could well hit a BUG_ON on POWER9.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300))
return -EIO;
for (i = 0; i < kvmppc_hpt_npte(&kvm->arch.hpt); i++) {
rc = resize_hpt_rehash_hpte(resize, i);
if (rc != 0)

3
arch/powerpc/kvm/powerpc.c
View file

@ -613,7 +613,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = 1;
break;
case KVM_CAP_SPAPR_RESIZE_HPT:
r = !!hv_enabled;
/* Disable this on POWER9 until code handles new HPTE format */
r = !!hv_enabled && !cpu_has_feature(CPU_FTR_ARCH_300);
break;
#endif
case KVM_CAP_PPC_HTM: