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KVM: PPC: Book3S HV: Make H_REMOVE return correct HPTE value for absent HPTEs

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This fixes a bug where the old HPTE value returned by H_REMOVE has
the valid bit clear if the HPTE was an absent HPTE, as happens for
HPTEs for emulated MMIO pages and for RAM pages that have been paged
out by the host.  If the absent bit is set, we clear it and set the
valid bit, because from the guest's point of view, the HPTE is valid.

Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras 2015-05-18 14:10:54 +10:00
parent 572abd563b
commit c64dfe2af3
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/kvm/book3s_hv_rm_mmu.c
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@ -470,6 +470,8 @@ long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
note_hpte_modification(kvm, rev);
unlock_hpte(hpte, 0);
if (v & HPTE_V_ABSENT)
v = (v & ~HPTE_V_ABSENT) | HPTE_V_VALID;
hpret[0] = v;
hpret[1] = r;
return H_SUCCESS;