diff options
| author | Paul Mackerras <paulus@samba.org> | 2011-12-12 12:38:51 +0000 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-03-05 14:52:38 +0200 |
| commit | 4cf302bc106566c5bad523337296ea8b72df63f5 (patch) | |
| tree | 65c633e045baf08b5700301725093c3b43330e1f /arch/powerpc/kvm/book3s_hv_rmhandlers.S | |
| parent | a355aa54f1d25dff83c0feef8863d83a76988fdb (diff) | |
| download | talos-op-linux-4cf302bc106566c5bad523337296ea8b72df63f5.tar.gz talos-op-linux-4cf302bc106566c5bad523337296ea8b72df63f5.zip | |
KVM: PPC: Allow for read-only pages backing a Book3S HV guest
With this, if a guest does an H_ENTER with a read/write HPTE on a page
which is currently read-only, we make the actual HPTE inserted be a
read-only version of the HPTE. We now intercept protection faults as
well as HPTE not found faults, and for a protection fault we work out
whether it should be reflected to the guest (e.g. because the guest HPTE
didn't allow write access to usermode) or handled by switching to
kernel context and calling kvmppc_book3s_hv_page_fault, which will then
request write access to the page and update the actual HPTE.
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/kvm/book3s_hv_rmhandlers.S')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rmhandlers.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 7d4990665d00..b70bf22a3ff3 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -1114,8 +1114,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) kvmppc_hdsi: mfspr r4, SPRN_HDAR mfspr r6, SPRN_HDSISR - /* HPTE not found fault? */ - andis. r0, r6, DSISR_NOHPTE@h + /* HPTE not found fault or protection fault? */ + andis. r0, r6, (DSISR_NOHPTE | DSISR_PROTFAULT)@h beq 1f /* if not, send it to the guest */ andi. r0, r11, MSR_DR /* data relocation enabled? */ beq 3f |
