From c64dfe2af3de448f9afa2e542983015b31c1f91c Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 18 May 2015 14:10:54 +1000 Subject: [PATCH] KVM: PPC: Book3S HV: Make H_REMOVE return correct HPTE value for absent HPTEs 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 --- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index c1df9bb1e413..97e7f8c853d8 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -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;