KVM: PPC: Book3s HV: Maintain separate guest and host views of R and C bits

Browse source

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>

...

This commit is contained in:

Paul Mackerras 2011-12-15 02:02:02 +00:00 • committed by Avi Kivity

parent a92bce95f0

commit bad3b5075e

3 changed files with 59 additions and 39 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

5

arch/powerpc/include/asm/kvm_host.h

View file

48

arch/powerpc/kvm/book3s_64_mmu_hv.c

View file

45

arch/powerpc/kvm/book3s_hv_rm_mmu.c

View file