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  1. 20 7月, 2008 8 次提交
  3. 26 6月, 2008 2 次提交
  5. 25 6月, 2008 1 次提交
  7. 24 6月, 2008 6 次提交
    • A
      KVM: VMX: Fix host msr corruption with preemption enabled · a9b21b62
      由 Avi Kivity 提交于 
      Switching msrs can occur either synchronously as a result of calls to
the msr management functions (usually in response to the guest touching
virtualized msrs), or asynchronously when preempting a kvm thread that has
guest state loaded.  If we're unlucky enough to have the two at the same
time, host msrs are corrupted and the machine goes kaput on the next syscall.

Most easily triggered by Windows Server 2008, as it does a lot of msr
switching during bootup.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      a9b21b62
    • A
      KVM: MMU: Fix oops on guest userspace access to guest pagetable · 6bf6a953
      由 Avi Kivity 提交于 
      KVM has a heuristic to unshadow guest pagetables when userspace accesses
them, on the assumption that most guests do not allow userspace to access
pagetables directly. Unfortunately, in addition to unshadowing the pagetables,
it also oopses.

This never triggers on ordinary guests since sane OSes will clear the
pagetables before assigning them to userspace, which will trigger the flood
heuristic, unshadowing the pagetables before the first userspace access. One
particular guest, though (Xenner) will run the kernel in userspace, triggering
the oops.  Since the heuristic is incorrect in this case, we can simply
remove it.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      6bf6a953
    • M
      KVM: MMU: large page update_pte issue with non-PAE 32-bit guests (resend) · 30945387
      由 Marcelo Tosatti 提交于 
      kvm_mmu_pte_write() does not handle 32-bit non-PAE large page backed
guests properly. It will instantiate two 2MB sptes pointing to the same
physical 2MB page when a guest large pte update is trapped.

Instead of duplicating code to handle this, disallow directory level
updates to happen through kvm_mmu_pte_write(), so the two 2MB sptes
emulating one guest 4MB pte can be correctly created by the page fault
handling path.
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      30945387
    • M
      KVM: MMU: Fix rmap_write_protect() hugepage iteration bug · 6597ca09
      由 Marcelo Tosatti 提交于 
      rmap_next() does not work correctly after rmap_remove(), as it expects
the rmap chains not to change during iteration.  Fix (for now) by restarting
iteration from the beginning.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      6597ca09
    • M
      KVM: close timer injection race window in __vcpu_run · 06e05645
      由 Marcelo Tosatti 提交于 
      If a timer fires after kvm_inject_pending_timer_irqs() but before
local_irq_disable() the code will enter guest mode and only inject such
timer interrupt the next time an unrelated event causes an exit.

It would be simpler if the timer->pending irq conversion could be done
with IRQ's disabled, so that the above problem cannot happen.

For now introduce a new vcpu requests bit to cancel guest entry.
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      06e05645
    • M
      KVM: Fix race between timer migration and vcpu migration · d4acf7e7
      由 Marcelo Tosatti 提交于 
      A guest vcpu instance can be scheduled to a different physical CPU
between the test for KVM_REQ_MIGRATE_TIMER and local_irq_disable().

If that happens, the timer will only be migrated to the current pCPU on
the next exit, meaning that guest LAPIC timer event can be delayed until
a host interrupt is triggered.

Fix it by cancelling guest entry if any vcpu request is pending.  This
has the side effect of nicely consolidating vcpu->requests checks.
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      d4acf7e7
  9. 07 6月, 2008 6 次提交
  11. 23 5月, 2008 1 次提交
  13. 18 5月, 2008 3 次提交
  15. 04 5月, 2008 13 次提交