Re: [Xen-devel] [RFC v1 14/15] Suppress posting interrupts when 'SN' is set

["Wu, Feng" <feng.wu@xxxxxxxxx>]

> -----Original Message-----
> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Friday, March 27, 2015 8:06 PM
> To: Wu, Feng; xen-devel@xxxxxxxxxxxxx
> Cc: Zhang, Yang Z; Tian, Kevin; keir@xxxxxxx; JBeulich@xxxxxxxx
> Subject: Re: [Xen-devel] [RFC v1 14/15] Suppress posting interrupts when 'SN' 
> is
> set
> 
> On 27/03/15 03:00, Wu, Feng wrote:
> >
> >>>    static void vmx_deliver_posted_intr(struct vcpu *v, u8 vector)
> >>>    {
> >>> +    int r, sn;
> >>> +
> >>>        if ( pi_test_and_set_pir(vector, &v->arch.hvm_vmx.pi_desc) )
> >>>            return;
> >>>
> >>> +    /*
> >>> +     * Currently, we don't support urgent interrupt, all interrupts
> >>> +     * are recognized as non-urgent interrupt, so we cannot send
> >>> +     * posted-interrupt when 'SN' is set.
> >>> +     */
> >>> +
> >>> +    sn = pi_test_sn(&v->arch.hvm_vmx.pi_desc);
> >> Is there anywhere which sets sn at all? I cant spot anywhere.
> >>
> > SN is set in [13/15] while vCPU is going to runnable state.
> 
> Then please do not set SN in the first place if we don't support it.


What do you mean here. Setting 'SN' can suppress non-urgent interrupt. (we only 
support this)

Thanks,
Feng

> 
> ~Andrew

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