Re: [PATCH v2 08/50] target/i386: Assert IOPL is 0 for user-only

[Paolo Bonzini]

On 14/05/21 17:13, Richard Henderson wrote:
> On real hardware, the linux kernel has the iopl(2) syscall which
> can set IOPL to 3, to allow e.g. the xserver to briefly disable
> interrupts while programming the graphics card.
>
> However, QEMU cannot and does not implement this syscall, so the
> IOPL is never changed from 0.  Which means that all of the checks
> vs CPL <= IOPL are false for user-only.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>