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  1. 02 4月, 2010 1 次提交
  3. 30 3月, 2010 1 次提交
  5. 04 3月, 2010 2 次提交
    • J
      KVM: Rework VCPU state writeback API · ea375f9a
      由 Jan Kiszka 提交于 
      This grand cleanup drops all reset and vmsave/load related
synchronization points in favor of four(!) generic hooks:

- cpu_synchronize_all_states in qemu_savevm_state_complete
  (initial sync from kernel before vmsave)
- cpu_synchronize_all_post_init in qemu_loadvm_state
  (writeback after vmload)
- cpu_synchronize_all_post_init in main after machine init
- cpu_synchronize_all_post_reset in qemu_system_reset
  (writeback after system reset)

These writeback points + the existing one of VCPU exec after
cpu_synchronize_state map on three levels of writeback:

- KVM_PUT_RUNTIME_STATE (during runtime, other VCPUs continue to run)
- KVM_PUT_RESET_STATE   (on synchronous system reset, all VCPUs stopped)
- KVM_PUT_FULL_STATE    (on init or vmload, all VCPUs stopped as well)

This level is passed to the arch-specific VCPU state writing function
that will decide which concrete substates need to be written. That way,
no writer of load, save or reset functions that interact with in-kernel
KVM states will ever have to worry about synchronization again. That
also means that a lot of reasons for races, segfaults and deadlocks are
eliminated.

cpu_synchronize_state remains untouched, just as Anthony suggested. We
continue to need it before reading or writing of VCPU states that are
also tracked by in-kernel KVM subsystems.

Consequently, this patch removes many cpu_synchronize_state calls that
are now redundant, just like remaining explicit register syncs.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
      ea375f9a
    • J
      KVM: Rework of guest debug state writing · b0b1d690
      由 Jan Kiszka 提交于 
      So far we synchronized any dirty VCPU state back into the kernel before
updating the guest debug state. This was a tribute to a deficite in x86
kernels before 2.6.33. But as this is an arch-dependent issue, it is
better handle in the x86 part of KVM and remove the writeback point for
generic code. This also avoids overwriting the flushed state later on if
user space decides to change some more registers before resuming the
guest.

We furthermore need to reinject guest exceptions via the appropriate
mechanism. That is KVM_SET_GUEST_DEBUG for older kernels and
KVM_SET_VCPU_EVENTS for recent ones. Using both mechanisms at the same
time will cause state corruptions.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
      b0b1d690
  7. 23 2月, 2010 1 次提交
  9. 22 2月, 2010 2 次提交
  11. 11 2月, 2010 1 次提交
  13. 10 2月, 2010 2 次提交
  15. 04 2月, 2010 2 次提交
    • J
      KVM: Move and rename regs_modified · 9ded2744
      由 Jan Kiszka 提交于 
      Touching the user space representation of KVM's VCPU state is -
naturally - a per-VCPU thing. So move the dirty flag into KVM_CPU_COMMON
and rename it at this chance to reflect its true meaning.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
      9ded2744
    • S
      kvm: Flush coalesced MMIO buffer periodly · 62a2744c
      由 Sheng Yang 提交于 
      The default action of coalesced MMIO is, cache the writing in buffer, until:
1. The buffer is full.
2. Or the exit to QEmu due to other reasons.

But this would result in a very late writing in some condition.
1. The each time write to MMIO content is small.
2. The writing interval is big.
3. No need for input or accessing other devices frequently.

This issue was observed in a experimental embbed system. The test image
simply print "test" every 1 seconds. The output in QEmu meets expectation,
but the output in KVM is delayed for seconds.

Per Avi's suggestion, I hooked flushing coalesced MMIO buffer in VGA update
handler. By this way, We don't need vcpu explicit exit to QEmu to
handle this issue.
Signed-off-by: NSheng Yang <sheng@linux.intel.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
      62a2744c
  17. 04 12月, 2009 2 次提交
  19. 17 11月, 2009 1 次提交
  21. 13 11月, 2009 1 次提交
  23. 12 10月, 2009 1 次提交
  25. 05 10月, 2009 2 次提交
  27. 02 10月, 2009 2 次提交
  29. 21 9月, 2009 1 次提交
  31. 12 9月, 2009 1 次提交
    • B
      Fix sys-queue.h conflict for good · 72cf2d4f
      由 Blue Swirl 提交于 
      Problem: Our file sys-queue.h is a copy of the BSD file, but there are
some additions and it's not entirely compatible. Because of that, there have
been conflicts with system headers on BSD systems. Some hacks have been
introduced in the commits 15cc9235,
f40d7537,
96555a96 and
3990d09a but the fixes were fragile.

Solution: Avoid the conflict entirely by renaming the functions and the
file. Revert the previous hacks.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
      72cf2d4f
  33. 28 8月, 2009 1 次提交
  35. 28 7月, 2009 4 次提交
    • A
      Revert "Fake dirty loggin when it's not there" · 6e489f3f
      由 Anthony Liguori 提交于 
      This reverts commit bd836776.

PPC should just implement dirty logging so we can avoid all the fall-out from
this changeset.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      6e489f3f
    • L
      Fix broken build · fc5d642f
      由 Luiz Capitulino 提交于 
      The only caller of on_vcpu() is protected by ifdef
KVM_CAP_SET_GUEST_DEBUG, so protect on_vcpu() too otherwise QEMU
may not to build.
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      fc5d642f
    • A
      Use Little Endian for Dirty Log · 96c1606b
      由 Alexander Graf 提交于 
      We currently use host endian long types to store information
in the dirty bitmap.

This works reasonably well on Little Endian targets, because the
u32 after the first contains the next 32 bits. On Big Endian this
breaks completely though, forcing us to be inventive here.

So Ben suggested to always use Little Endian, which looks reasonable.

We only have dirty bitmap implemented in Little Endian targets so far
and since PowerPC would be the first Big Endian platform, we can just
as well switch to Little Endian always with little effort without
breaking existing targets.

This is the userspace part of the patch. It shouldn't change anything
for existing targets, but help PowerPC.

It replaces my older patch called "Use 64bit pointer for dirty log".
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      96c1606b
    • A
      Use 64bit pointer for dirty log · 1c7936e3
      由 Alexander Graf 提交于 
      Dirty logs currently get written with native "long" size. On little endian
it doesn't matter if we use uint64_t instead though, because we'd still end
up using the right bytes.

On big endian, this does become a bigger problem, so we need to ensure that
kernel and userspace talk the same language, which means getting rid of "long"
and using a defined size instead.

So I decided to use 64 bit types at all times. This doesn't break existing
targets but will in conjunction with a patch I'll send to the KVM ML make
dirty logs work with 32 bit userspace on 64 kernel with big endian.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      1c7936e3
  37. 22 7月, 2009 4 次提交
  39. 30 6月, 2009 2 次提交
  41. 17 6月, 2009 1 次提交
    • J
      kvm: Fix IRQ injection into full queue · 8c14c173
      由 Jan Kiszka 提交于 
      User space may only inject interrupts during kvm_arch_pre_run if
ready_for_interrupt_injection is set in kvm_run. But that field is
updated on exit from KVM_RUN, so we must ensure that we enter the
kernel after potentially queuing an interrupt, otherwise we risk to
loose one - like it happens with the current code against latest
kernel modules (since kvm-86) that started to queue only a single
interrupt.

Fix the problem by reordering kvm_cpu_exec.

Credits go to Gleb Natapov for analyzing the issue in details.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      8c14c173
  43. 07 6月, 2009 1 次提交
  45. 22 5月, 2009 4 次提交