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  1. 17 4月, 2013 1 次提交
    • Y
      KVM: VMX: Enable acknowledge interupt on vmexit · a547c6db
      由 Yang Zhang 提交于 
      The "acknowledge interrupt on exit" feature controls processor behavior
for external interrupt acknowledgement. When this control is set, the
processor acknowledges the interrupt controller to acquire the
interrupt vector on VM exit.

After enabling this feature, an interrupt which arrived when target cpu is
running in vmx non-root mode will be handled by vmx handler instead of handler
in idt. Currently, vmx handler only fakes an interrupt stack and jump to idt
table to let real handler to handle it. Further, we will recognize the interrupt
and only delivery the interrupt which not belong to current vcpu through idt table.
The interrupt which belonged to current vcpu will be handled inside vmx handler.
This will reduce the interrupt handle cost of KVM.

Also, interrupt enable logic is changed if this feature is turnning on:
Before this patch, hypervior call local_irq_enable() to enable it directly.
Now IF bit is set on interrupt stack frame, and will be enabled on a return from
interrupt handler if exterrupt interrupt exists. If no external interrupt, still
call local_irq_enable() to enable it.

Refer to Intel SDM volum 3, chapter 33.2.
Signed-off-by: NYang Zhang <yang.z.zhang@Intel.com>
Reviewed-by: NGleb Natapov <gleb@redhat.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
      a547c6db
  3. 16 4月, 2013 7 次提交
  5. 14 4月, 2013 8 次提交
  7. 11 4月, 2013 1 次提交
    • K
      KVM: x86 emulator: Fix segment loading in VM86 · f8da94e9
      由 Kevin Wolf 提交于 
      This fixes a regression introduced in commit 03ebebeb ("KVM: x86
emulator: Leave segment limit and attributs alone in real mode").

The mentioned commit changed the segment descriptors for both real mode
and VM86 to only update the segment base instead of creating a
completely new descriptor with limit 0xffff so that unreal mode keeps
working across a segment register reload.

This leads to an invalid segment descriptor in the eyes of VMX, which
seems to be okay for real mode because KVM will fix it up before the
next VM entry or emulate the state, but it doesn't do this if the guest
is in VM86, so we end up with:

  KVM: entry failed, hardware error 0x80000021

Fix this by effectively reverting commit 03ebebeb for VM86 and leaving
it only in place for real mode, which is where it's really needed.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NGleb Natapov <gleb@redhat.com>
      f8da94e9
  9. 08 4月, 2013 6 次提交
  11. 07 4月, 2013 5 次提交
  13. 02 4月, 2013 12 次提交