linux-stable.git/arch/arm/kvm, branch linux-3.9.y

ARM: KVM: fix unbalanced get_cpu() in access_dcsw

2013-04-17T19:51:32+00:00

In the very unlikely event where a guest would be foolish enough to
*read* from a write-only cache maintainance register, we end up
with preemption disabled, due to a misplaced get_cpu().

Just move the "is_write" test outside of the critical section.

Signed-off-by: Marc Zyngier 
Signed-off-by: Christoffer Dall 
Signed-off-by: Linus Torvalds

ARM: KVM: fix KVM_CAP_ARM_SET_DEVICE_ADDR reporting

2013-04-16T23:21:24+00:00

Commit 3401d54696f9 (KVM: ARM: Introduce KVM_ARM_SET_DEVICE_ADDR
ioctl) added support for the KVM_CAP_ARM_SET_DEVICE_ADDR capability,
but failed to add a break in the relevant case statement, returning
the number of CPUs instead.

Luckilly enough, the CONFIG_NR_CPUS=0 patch hasn't been merged yet
(https://lkml.org/lkml/diff/2012/3/31/131/1), so the bug wasn't
noticed.

Just give it a break!

Signed-off-by: Marc Zyngier 
Signed-off-by: Christoffer Dall

Merge branch 'kvm-arm/vgic-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into fixes

2013-03-22T17:10:35+00:00

ARM: KVM: fix compilation after removal of user_alloc from struct kvm_memory_slot

2013-02-25T09:48:41+00:00

Commit 7a905b1 (KVM: Remove user_alloc from struct kvm_memory_slot)
broke KVM/ARM by removing the user_alloc field from a public structure.

As we only used this field to alert the user that we didn't support
this operation mode, there is no harm in discarding this bit of code
without any remorse.

Signed-off-by: Marc Zyngier 
Signed-off-by: Gleb Natapov

ARM: KVM: fix kvm_arch_{prepare,commit}_memory_region

2013-02-25T09:47:28+00:00

Commit f82a8cfe9 (KVM: struct kvm_memory_slot.user_alloc -> bool)
broke the ARM KVM port by changing the prototype of two global
functions.

Apply the same change to fix the compilation breakage.

Signed-off-by: Marc Zyngier 
Signed-off-by: Gleb Natapov

ARM: KVM: vgic: take distributor lock on sync_hwstate path

2013-02-22T13:29:38+00:00

Now that the maintenance interrupt handling is actually out of the
handler itself, the code becomes quite racy as we can get preempted
while we process the state.

Wrapping this code around the distributor lock ensures that we're not
preempted and relatively race-free.

Signed-off-by: Marc Zyngier

ARM: KVM: vgic: force EOIed LRs to the empty state

2013-02-22T13:29:37+00:00

The VGIC doesn't guarantee that an EOIed LR that has been configured
to generate a maintenance interrupt will appear as empty.

While the code recovers from this situation, it is better to clean
the LR and flag it as empty so it can be quickly recycled.

Signed-off-by: Marc Zyngier

ARM: KVM: arch_timers: Wire the init code and config option

2013-02-11T19:06:00+00:00

It is now possible to select CONFIG_KVM_ARM_TIMER to enable the
KVM architected timer support.

Reviewed-by: Will Deacon 
Signed-off-by: Christoffer Dall 
Signed-off-by: Marc Zyngier

ARM: KVM: arch_timers: Add timer world switch

2013-02-11T19:05:38+00:00

Do the necessary save/restore dance for the timers in the world
switch code. In the process, allow the guest to read the physical
counter, which is useful for its own clock_event_device.

Reviewed-by: Will Deacon 
Signed-off-by: Christoffer Dall 
Signed-off-by: Marc Zyngier

ARM: KVM: arch_timers: Add guest timer core support

2013-02-11T19:05:11+00:00

Add some the architected timer related infrastructure, and support timer
interrupt injection, which can happen as a resultof three possible
events:

- The virtual timer interrupt has fired while we were still
  executing the guest
- The timer interrupt hasn't fired, but it expired while we
  were doing the world switch
- A hrtimer we programmed earlier has fired

Reviewed-by: Will Deacon 
Signed-off-by: Christoffer Dall 
Signed-off-by: Marc Zyngier