linux-stable.git/drivers/lguest, branch linux-3.10.y

lguest: fix out-by-one error in address checking.

2015-06-06T06:19:54+00:00

commit 83a35114d0e4583e6b0ca39502e68b6a92e2910c upstream.

This bug has been there since day 1; addresses in the top guest physical
page weren't considered valid.  You could map that page (the check in
check_gpte() is correct), but if a guest tried to put a pagetable there
we'd check that address manually when walking it, and kill the guest.

Signed-off-by: Rusty Russell 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

x86, flags: Rename X86_EFLAGS_BIT1 to X86_EFLAGS_FIXED

2014-11-14T16:47:54+00:00

commit 1adfa76a95fe4444124a502f7cc858a39d5b8e01 upstream.

Bit 1 in the x86 EFLAGS is always set.  Name the macro something that
actually tries to explain what it is all about, rather than being a
tautology.

Signed-off-by: H. Peter Anvin 
Cc: Rusty Russell 
Cc: Gleb Natapov 
Cc: Paolo Bonzini 
Link: http://lkml.kernel.org/n/tip-f10rx5vjjm6tfnt8o1wseb3v@git.kernel.org
Signed-off-by: Greg Kroah-Hartman

lguest: clear cached last cpu when guest_set_pgd() called.

2013-05-08T01:19:18+00:00

commit v3.9-rc1-53-g6d0cda9 "lguest: cache last cpu we ran on." missed
one case, which causes a triple fault.  The guest calls guest_set_pgd()
on the top page, and we carefully remap the Switcher text page.  But
we didn't reset last_host_cpu, so map_switcher_in_guest() thinks
the guest's regs and IDT/GDT etc are already mapped.

Reported-by: Paul Bolle 
Tested-by: Paul Bolle 
Signed-off-by: Rusty Russell

Merge tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2013-05-02T21:14:04+00:00

Pull virtio & lguest updates from Rusty Russell:
 "Lots of virtio work which wasn't quite ready for last merge window.

  Plus I dived into lguest again, reworking the pagetable code so we can
  move the switcher page: our fixmaps sometimes take more than 2MB now..."

Ugh.  Annoying conflicts with the tcm_vhost -> vhost_scsi rename.
Hopefully correctly resolved.

* tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (57 commits)
  caif_virtio: Remove bouncing email addresses
  lguest: improve code readability in lg_cpu_start.
  virtio-net: fill only rx queues which are being used
  lguest: map Switcher below fixmap.
  lguest: cache last cpu we ran on.
  lguest: map Switcher text whenever we allocate a new pagetable.
  lguest: don't share Switcher PTE pages between guests.
  lguest: expost switcher_pages array (as lg_switcher_pages).
  lguest: extract shadow PTE walking / allocating.
  lguest: make check_gpte et. al return bool.
  lguest: assume Switcher text is a single page.
  lguest: rename switcher_page to switcher_pages.
  lguest: remove RESERVE_MEM constant.
  lguest: check vaddr not pgd for Switcher protection.
  lguest: prepare to make SWITCHER_ADDR a variable.
  virtio: console: replace EMFILE with EBUSY for already-open port
  virtio-scsi: reset virtqueue affinity when doing cpu hotplug
  virtio-scsi: introduce multiqueue support
  virtio-scsi: push vq lock/unlock into virtscsi_vq_done
  virtio-scsi: pass struct virtio_scsi to virtqueue completion function
  ...

lguest: rename random32() to prandom_u32()

2013-04-30T01:28:43+00:00

Use preferable function name which implies using a pseudo-random
number generator.

Signed-off-by: Akinobu Mita 
Acked-by: Rusty Russell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

lguest: improve code readability in lg_cpu_start.

2013-04-29T23:54:30+00:00

Make the container_of call friendlier and fix some comment slip-ups.

Signed-off-by: Cosmin Paraschiv 
Cc: Daniel Baluta 
Signed-off-by: Rusty Russell

lguest: map Switcher below fixmap.

2013-04-22T06:15:03+00:00

Now we've adjusted all the code, we can simply set switcher_addr to
wherever it needs to go below the fixmaps, rather than asserting that
it should be so.

With large NR_CPUS and PAE, people were hitting the "mapping switcher
would thwack fixmap" message.

Reported-by: Paul Bolle 
Signed-off-by: Rusty Russell

lguest: cache last cpu we ran on.

2013-04-22T06:15:03+00:00

This optimizes the frobbing of our Switcher map.

Signed-off-by: Rusty Russell

lguest: map Switcher text whenever we allocate a new pagetable.

2013-04-22T06:15:02+00:00

It's always to same, so no need to put in the PTE every time we're
about to run.  Keep a flag to track whether the pagetable has the
Switcher entries allocated, and when allocating always initialize the
Switcher text PTE.

Signed-off-by: Rusty Russell

lguest: don't share Switcher PTE pages between guests.

2013-04-22T06:15:01+00:00

We currently use the whole top PGD entry for the switcher, so we
simply share a fixed page of PTEs between all guests (actually, it's
one per Host CPU, to ensure isolation between guests).

Changes to a scheme where every guest has its own mappings.

Signed-off-by: Rusty Russell