Il 06/03/2014 18:33, Jan Kiszka ha scritto:
> Move the check for leaving L2 on pending and intercepted IRQs or NMIs
> from the *_allowed handler into a dedicated callback. Invoke this
> callback at the relevant points before KVM checks if IRQs/NMIs can be
> injected. The callback has the task to switch from L2 to L1 if needed
> and inject the proper vmexit events.
>
> The rework fixes L2 wakeups from HLT and provides the foundation for
> preemption timer emulation.
>
> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
> ---
> arch/x86/include/asm/kvm_host.h | 2 ++
> arch/x86/kvm/vmx.c | 67 +++++++++++++++++++++++------------------
> arch/x86/kvm/x86.c | 15 +++++++--
> 3 files changed, 53 insertions(+), 31 deletions(-)
With this patch do we still need
if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu))
/*
* We get here if vmx_interrupt_allowed() said we can't
* inject to L1 now because L2 must run. The caller will have
* to make L2 exit right after entry, so we can inject to L1
* more promptly.
*/
return -EBUSY;
in enable_irq_window? If not, enable_nmi_window and enable_irq_window
can both return void.
And perhaps, vmx_check_nested_events could use the preemption timer trick
from Jailhouse instead of smp_send_reschedule.
Paolo
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