Re: [Xen-devel] [PATCH V2] xen: Enable interrupts when calling _cond_resched()

[Jürgen Groß <jgross@xxxxxxxx>]

On 19.02.20 18:30, Thomas Gleixner wrote:
> xen_maybe_preempt_hcall() is called from the exception entry point
> xen_do_hypervisor_callback with interrupts disabled.
>
> _cond_resched() evades the might_sleep() check in cond_resched() which
> would have caught that and schedule_debug() unfortunately lacks a check
> for irqs_disabled().
>
> Enable interrupts around the call and use cond_resched() to catch future
> issues.
>
> Fixes: fdfd811ddde3 ("x86/xen: allow privcmd hypercalls to be preempted")
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen


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