diff options
| author | Paul Mackerras <paulus@samba.org> | 2011-12-15 02:02:02 +0000 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-03-05 14:52:39 +0200 |
| commit | bad3b5075eeb18cb1641b4171618add638bc0fa7 (patch) | |
| tree | 11c599691f17ef931ef5dbb8d8e788c500752554 /arch/powerpc/include/asm/kvm_host.h | |
| parent | a92bce95f0f967dfa6205527d7143d276b0be6a7 (diff) | |
KVM: PPC: Book3s HV: Maintain separate guest and host views of R and C bits
This allows both the guest and the host to use the referenced (R) and
changed (C) bits in the guest hashed page table. The guest has a view
of R and C that is maintained in the guest_rpte field of the revmap
entry for the HPTE, and the host has a view that is maintained in the
rmap entry for the associated gfn.
Both view are updated from the guest HPT. If a bit (R or C) is zero
in either view, it will be initially set to zero in the HPTE (or HPTEs),
until set to 1 by hardware. When an HPTE is removed for any reason,
the R and C bits from the HPTE are ORed into both views. We have to
be careful to read the R and C bits from the HPTE after invalidating
it, but before unlocking it, in case of any late updates by the hardware.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/include/asm/kvm_host.h')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_host.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 968f3aa61cd..1cb6e522485 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -200,8 +200,9 @@ struct revmap_entry { * index in the guest HPT of a HPTE that points to the page. */ #define KVMPPC_RMAP_LOCK_BIT 63 -#define KVMPPC_RMAP_REF_BIT 33 -#define KVMPPC_RMAP_REFERENCED (1ul << KVMPPC_RMAP_REF_BIT) +#define KVMPPC_RMAP_RC_SHIFT 32 +#define KVMPPC_RMAP_REFERENCED (HPTE_R_R << KVMPPC_RMAP_RC_SHIFT) +#define KVMPPC_RMAP_CHANGED (HPTE_R_C << KVMPPC_RMAP_RC_SHIFT) #define KVMPPC_RMAP_PRESENT 0x100000000ul #define KVMPPC_RMAP_INDEX 0xfffffffful |