Re: [PATCH 0/4] Real mode interrupt injection emulation

Marcelo Tosatti
2010-09-22T20:50:43Z

On Sun, Sep 19, 2010 at 02:34:04PM +0200, Avi Kivity wrote:
> Our current real mode interrupt injection injects external interrupts as
> software interrupts, which is somewhat hacky. This is problematic in big
> real mode (can't use vmx there) and on via processors (a cpu bug prevents
> this from working correctly).
>
> Replace the current mechanism with emulation; we now inject the interrupt
> by looking up the vector in the IVT, updating the stack, etc. using the
> emulator. This is somewhat slower but works in all cases.
>
> Avi Kivity (1):
> KVM: VMX: Respect interrupt window in big real mode
>
> Mohammed Gamal (3):
> KVM: x86 emulator: Expose emulate_int_real()
> KVM: Add kvm_inject_realmode_interrupt() wrapper
> KVM: VMX: Emulated real mode interrupt injection
>
> arch/x86/include/asm/kvm_emulate.h | 3 +-
> arch/x86/kvm/vmx.c | 74 +++++++----------------------------
> arch/x86/kvm/x86.c | 29 ++++++++++++++
> arch/x86/kvm/x86.h | 1 +
> 4 files changed, 47 insertions(+), 60 deletions(-)
>
> --
> 1.7.2.3

Applied, thanks.