linux-toradex.git/include/linux/kvm_host.h, branch v2.6.38.5

KVM: Fix build error on s390 due to missing tlbs_dirty

2011-01-12T09:30:50+00:00

Make it available for all archs.

Signed-off-by: Avi Kivity

KVM: MMU: Make the way of accessing lpage_info more generic

2011-01-12T09:30:47+00:00

Large page information has two elements but one of them, write_count, alone
is accessed by a helper function.

This patch replaces this helper function with more generic one which returns
newly named kvm_lpage_info structure and use it to access the other element
rmap_pde.

Signed-off-by: Takuya Yoshikawa 
Signed-off-by: Avi Kivity

KVM: MMU: delay flush all tlbs on sync_page path

2011-01-12T09:29:51+00:00

Quote from Avi:
| I don't think we need to flush immediately; set a "tlb dirty" bit somewhere
| that is cleareded when we flush the tlb.  kvm_mmu_notifier_invalidate_page()
| can consult the bit and force a flush if set.

Signed-off-by: Xiao Guangrong 
Signed-off-by: Marcelo Tosatti

KVM: PPC: Fix compile warning

2011-01-12T09:29:42+00:00

KVM compilation fails with the following warning:

include/linux/kvm_host.h: In function 'kvm_irq_routing_update':
include/linux/kvm_host.h:679:2: error: 'struct kvm' has no member named 'irq_routing'

That function is only used and reasonable to have on systems that implement
an in-kernel interrupt chip. PPC doesn't.

Fix by #ifdef'ing it out when no irqchip is available.

Signed-off-by: Alexander Graf 
Signed-off-by: Avi Kivity

KVM: fast-path msi injection with irqfd

2011-01-12T09:29:38+00:00

Store irq routing table pointer in the irqfd object,
and use that to inject MSI directly without bouncing out to
a kernel thread.

While we touch this structure, rearrange irqfd fields to make fastpath
better packed for better cache utilization.

This also adds some comments about locking rules and rcu usage in code.

Some notes on the design:
- Use pointer into the rt instead of copying an entry,
  to make it possible to use rcu, thus side-stepping
  locking complexities.  We also save some memory this way.
- Old workqueue code is still used for level irqs.
  I don't think we DTRT with level anyway, however,
  it seems easier to keep the code around as
  it has been thought through and debugged, and fix level later than
  rip out and re-instate it later.

Signed-off-by: Michael S. Tsirkin 
Acked-by: Marcelo Tosatti 
Acked-by: Gregory Haskins 
Signed-off-by: Avi Kivity

KVM: Refactor IRQ names of assigned devices

2011-01-12T09:29:21+00:00

Cosmetic change, but it helps to correlate IRQs with PCI devices.

Acked-by: Alex Williamson 
Acked-by: Michael S. Tsirkin 
Signed-off-by: Jan Kiszka 
Signed-off-by: Marcelo Tosatti

KVM: Switch assigned device IRQ forwarding to threaded handler

2011-01-12T09:29:20+00:00

This improves the IRQ forwarding for assigned devices: By using the
kernel's threaded IRQ scheme, we can get rid of the latency-prone work
queue and simplify the code in the same run.

Moreover, we no longer have to hold assigned_dev_lock while raising the
guest IRQ, which can be a lenghty operation as we may have to iterate
over all VCPUs. The lock is now only used for synchronizing masking vs.
unmasking of INTx-type IRQs, thus is renames to intx_lock.

Acked-by: Alex Williamson 
Acked-by: Michael S. Tsirkin 
Signed-off-by: Jan Kiszka 
Signed-off-by: Marcelo Tosatti

KVM: Clean up vm creation and release

2011-01-12T09:29:09+00:00

IA64 support forces us to abstract the allocation of the kvm structure.
But instead of mixing this up with arch-specific initialization and
doing the same on destruction, split both steps. This allows to move
generic destruction calls into generic code.

It also fixes error clean-up on failures of kvm_create_vm for IA64.

Signed-off-by: Jan Kiszka 
Signed-off-by: Avi Kivity

KVM: pre-allocate one more dirty bitmap to avoid vmalloc()

2011-01-12T09:28:46+00:00

Currently x86's kvm_vm_ioctl_get_dirty_log() needs to allocate a bitmap by
vmalloc() which will be used in the next logging and this has been causing
bad effect to VGA and live-migration: vmalloc() consumes extra systime,
triggers tlb flush, etc.

This patch resolves this issue by pre-allocating one more bitmap and switching
between two bitmaps during dirty logging.

Performance improvement:
  I measured performance for the case of VGA update by trace-cmd.
  The result was 1.5 times faster than the original one.

  In the case of live migration, the improvement ratio depends on the workload
  and the guest memory size. In general, the larger the memory size is the more
  benefits we get.

Note:
  This does not change other architectures's logic but the allocation size
  becomes twice. This will increase the actual memory consumption only when
  the new size changes the number of pages allocated by vmalloc().

Signed-off-by: Takuya Yoshikawa 
Signed-off-by: Fernando Luis Vazquez Cao 
Signed-off-by: Marcelo Tosatti

KVM: propagate fault r/w information to gup(), allow read-only memory

2011-01-12T09:28:40+00:00

As suggested by Andrea, pass r/w error code to gup(), upgrading read fault
to writable if host pte allows it.

Signed-off-by: Marcelo Tosatti 
Signed-off-by: Avi Kivity