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  1. 05 2月, 2013 4 次提交
  3. 30 1月, 2013 2 次提交
    • C
      s390/kvm: Fix instruction decoding · 0c29b229
      由 Christian Borntraeger 提交于 
      Instructions with long displacement have a signed displacement.
Currently the sign bit is interpreted as 2^20: Lets fix it by doing the
sign extension from 20bit to 32bit and then use it as a signed variable
in the addition (see kvm_s390_get_base_disp_rsy).

Furthermore, there are lots of "int" in that code. This is problematic,
because shifting on a signed integer is undefined/implementation defined
if the bit value happens to be negative.
Fortunately the promotion rules will make the right hand side unsigned
anyway, so there is no real problem right now.
Let's convert them anyway to unsigned where appropriate to avoid
problems if the code is changed or copy/pasted later on.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NGleb Natapov <gleb@redhat.com>
      0c29b229
    • C
      s390/kvm: Fix store status for ACRS/FPRS · 15bc8d84
      由 Christian Borntraeger 提交于 
      On store status we need to copy the current state of registers
into a save area. Currently we might save stale versions:
The sie state descriptor doesnt have fields for guest ACRS,FPRS,
those registers are simply stored in the host registers. The host
program must copy these away if needed. We do that in vcpu_put/load.

If we now do a store status in KVM code between vcpu_put/load, the
saved values are not up-to-date. Lets collect the ACRS/FPRS before
saving them.

This also fixes some strange problems with hotplug and virtio-ccw,
since the low level machine check handler (on hotplug a machine check
will happen) will revalidate all registers with the content of the
save area.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
CC: stable@vger.kernel.org
Signed-off-by: NGleb Natapov <gleb@redhat.com>
      15bc8d84
  5. 29 1月, 2013 3 次提交
  7. 27 1月, 2013 1 次提交
  9. 24 1月, 2013 17 次提交
  11. 22 1月, 2013 3 次提交
  13. 17 1月, 2013 1 次提交
  15. 14 1月, 2013 7 次提交
  17. 11 1月, 2013 2 次提交
    • X
      KVM: MMU: fix infinite fault access retry · 7751babd
      由 Xiao Guangrong 提交于 
      We have two issues in current code:
- if target gfn is used as its page table, guest will refault then kvm will use
  small page size to map it. We need two #PF to fix its shadow page table

- sometimes, say a exception is triggered during vm-exit caused by #PF
  (see handle_exception() in vmx.c), we remove all the shadow pages shadowed
  by the target gfn before go into page fault path, it will cause infinite
  loop:
  delete shadow pages shadowed by the gfn -> try to use large page size to map
  the gfn -> retry the access ->...

To fix these, we can adjust page size early if the target gfn is used as page
table
Signed-off-by: NXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
      7751babd
    • X
      KVM: MMU: fix Dirty bit missed if CR0.WP = 0 · c2288505
      由 Xiao Guangrong 提交于 
      If the write-fault access is from supervisor and CR0.WP is not set on the
vcpu, kvm will fix it by adjusting pte access - it sets the W bit on pte
and clears U bit. This is the chance that kvm can change pte access from
readonly to writable

Unfortunately, the pte access is the access of 'direct' shadow page table,
means direct sp.role.access = pte_access, then we will create a writable
spte entry on the readonly shadow page table. It will cause Dirty bit is
not tracked when two guest ptes point to the same large page. Note, it
does not have other impact except Dirty bit since cr0.wp is encoded into
sp.role

It can be fixed by adjusting pte access before establishing shadow page
table. Also, after that, no mmu specified code exists in the common function
and drop two parameters in set_spte
Signed-off-by: NXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
      c2288505