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authorPaul Mackerras <paulus@samba.org>2013-04-18 19:50:24 +0000
committerAlexander Graf <agraf@suse.de>2013-04-26 20:27:12 +0200
commita1b4a0f6064aacad0d708105e6f60a06e93fbf37 (patch)
tree7bbe9a95f283307775ec93dd95b2e02173a5487c /arch/powerpc/kvm/book3s_hv_rm_mmu.c
parentd9ce6041b39cf0b48978db63713f9b7e25ef9792 (diff)
KVM: PPC: Book3S HV: Make HPT reading code notice R/C bit changes
At present, the code that determines whether a HPT entry has changed, and thus needs to be sent to userspace when it is copying the HPT, doesn't consider a hardware update to the reference and change bits (R and C) in the HPT entries to constitute a change that needs to be sent to userspace. This adds code to check for changes in R and C when we are scanning the HPT to find changed entries, and adds code to set the changed flag for the HPTE when we update the R and C bits in the guest view of the HPTE. Since we now need to set the HPTE changed flag in book3s_64_mmu_hv.c as well as book3s_hv_rm_mmu.c, we move the note_hpte_modification() function into kvm_book3s_64.h. Current Linux guest kernels don't use the hardware updates of R and C in the HPT, so this change won't affect them. Linux (or other) kernels might in future want to use the R and C bits and have them correctly transferred across when a guest is migrated, so it is better to correct this deficiency. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_rm_mmu.c')
-rw-r--r--arch/powerpc/kvm/book3s_hv_rm_mmu.c11
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
index 19c93bae1aea..6dcbb49105a4 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
@@ -97,17 +97,6 @@ void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
}
EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain);
-/*
- * Note modification of an HPTE; set the HPTE modified bit
- * if anyone is interested.
- */
-static inline void note_hpte_modification(struct kvm *kvm,
- struct revmap_entry *rev)
-{
- if (atomic_read(&kvm->arch.hpte_mod_interest))
- rev->guest_rpte |= HPTE_GR_MODIFIED;
-}
-
/* Remove this HPTE from the chain for a real page */
static void remove_revmap_chain(struct kvm *kvm, long pte_index,
struct revmap_entry *rev,

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