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From: George Dunlap <george.dunlap@citrix.com>
To: Dario Faggioli <dario.faggioli@citrix.com>,
	"Wu, Feng" <feng.wu@intel.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>, Keir Fraser <keir@xen.org>,
	George Dunlap <george.dunlap@eu.citrix.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
	Jan Beulich <jbeulich@suse.com>
Subject: Re: [PATCH v7 15/17] vmx: VT-d posted-interrupt core logic handling
Date: Thu, 17 Sep 2015 12:44:44 +0100	[thread overview]
Message-ID: <55FAA7AC.3010909@citrix.com> (raw)
In-Reply-To: <55FA8A02.30705@citrix.com>

On 09/17/2015 10:38 AM, George Dunlap wrote:
> Is it the case that the interrupt is not actually delivered to the
> processor, but that the pending bit will be set in the pi field, so that
> the interrupt will be delivered the next time the hypervisor returns
> into the guest?
> 
> (I am assuming that is the case, because if the hypervisor *does* get an
> interrupt, then it can just unblock it there.)

Actually, it looks like you *do* in fact get a
pi_notification_interrupt() in this case.  Could we to check to see if
the current vcpu is blocked and unblock it?

I haven't yet decided whether I prefer my original suggestion of
switching the interrupt and putting things on the wake-up list in
vcpu_block(), or of deferring adding things to the wake-up list until
the actual context switch.

 -George

  parent reply	other threads:[~2015-09-17 11:44 UTC|newest]

Thread overview: 86+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-11  8:28 [PATCH v7 00/17] Add VT-d Posted-Interrupts support Feng Wu
2015-09-11  8:28 ` [PATCH v7 01/17] VT-d Posted-intterrupt (PI) design Feng Wu
2015-09-11  8:28 ` [PATCH v7 02/17] Add cmpxchg16b support for x86-64 Feng Wu
2015-09-22 13:50   ` Jan Beulich
2015-09-22 13:55     ` Wu, Feng
2015-09-11  8:28 ` [PATCH v7 03/17] iommu: Add iommu_intpost to control VT-d Posted-Interrupts feature Feng Wu
2015-09-11  8:28 ` [PATCH v7 04/17] vt-d: VT-d Posted-Interrupts feature detection Feng Wu
2015-09-22 14:18   ` Jan Beulich
2015-09-11  8:28 ` [PATCH v7 05/17] vmx: Extend struct pi_desc to support VT-d Posted-Interrupts Feng Wu
2015-09-22 14:20   ` Jan Beulich
2015-09-23  1:02     ` Wu, Feng
2015-09-23  7:36       ` Jan Beulich
2015-09-11  8:28 ` [PATCH v7 06/17] vmx: Add some helper functions for Posted-Interrupts Feng Wu
2015-09-11  8:28 ` [PATCH v7 07/17] vmx: Initialize VT-d Posted-Interrupts Descriptor Feng Wu
2015-09-11  8:28 ` [PATCH v7 08/17] vmx: Suppress posting interrupts when 'SN' is set Feng Wu
2015-09-22 14:23   ` Jan Beulich
2015-09-11  8:28 ` [PATCH v7 09/17] VT-d: Remove pointless casts Feng Wu
2015-09-22 14:30   ` Jan Beulich
2015-09-11  8:28 ` [PATCH v7 10/17] vt-d: Extend struct iremap_entry to support VT-d Posted-Interrupts Feng Wu
2015-09-22 14:28   ` Jan Beulich
2015-09-11  8:29 ` [PATCH v7 11/17] vt-d: Add API to update IRTE when VT-d PI is used Feng Wu
2015-09-22 14:42   ` Jan Beulich
2015-09-11  8:29 ` [PATCH v7 12/17] x86: move some APIC related macros to apicdef.h Feng Wu
2015-09-22 14:44   ` Jan Beulich
2015-09-11  8:29 ` [PATCH v7 13/17] Update IRTE according to guest interrupt config changes Feng Wu
2015-09-22 14:51   ` Jan Beulich
2015-09-11  8:29 ` [PATCH v7 14/17] vmx: Properly handle notification event when vCPU is running Feng Wu
2015-09-11  8:29 ` [PATCH v7 15/17] vmx: VT-d posted-interrupt core logic handling Feng Wu
2015-09-16 16:00   ` Dario Faggioli
2015-09-16 17:18   ` Dario Faggioli
2015-09-16 18:05     ` Dario Faggioli
2015-09-17  8:00     ` Wu, Feng
2015-09-17  8:48       ` Dario Faggioli
2015-09-17  9:16         ` Wu, Feng
2015-09-17  9:38         ` George Dunlap
2015-09-17  9:39           ` George Dunlap
2015-09-17 11:44           ` George Dunlap [this message]
2015-09-17 12:40             ` Dario Faggioli
2015-09-17 14:30               ` George Dunlap
2015-09-17 16:36                 ` Dario Faggioli
2015-09-18  6:27                 ` Jan Beulich
2015-09-18  9:22                   ` Dario Faggioli
2015-09-18 14:31                     ` George Dunlap
2015-09-18 14:34                       ` George Dunlap
2015-09-11  8:29 ` [PATCH v7 16/17] VT-d: Dump the posted format IRTE Feng Wu
2015-09-22 14:58   ` Jan Beulich
2015-09-11  8:29 ` [PATCH v7 17/17] Add a command line parameter for VT-d posted-interrupts Feng Wu
  -- strict thread matches above, loose matches on Subject: below --
2015-09-21  5:08 [PATCH v7 15/17] vmx: VT-d posted-interrupt core logic handling Wu, Feng
2015-09-21  9:18 ` George Dunlap
2015-09-21 11:59   ` Wu, Feng
2015-09-21 13:31     ` Dario Faggioli
2015-09-21 13:50       ` Wu, Feng
2015-09-21 14:11         ` Dario Faggioli
2015-09-22  5:10           ` Wu, Feng
2015-09-22 10:43             ` George Dunlap
2015-09-22 10:46               ` George Dunlap
2015-09-22 13:25                 ` Wu, Feng
2015-09-22 13:40                   ` Dario Faggioli
2015-09-22 13:52                     ` Wu, Feng
2015-09-22 14:15                       ` George Dunlap
2015-09-22 14:38                         ` Dario Faggioli
2015-09-23  5:52                           ` Wu, Feng
2015-09-23  7:59                             ` Dario Faggioli
2015-09-23  8:11                               ` Wu, Feng
2015-09-22 14:28                   ` George Dunlap
2015-09-23  5:37                     ` Wu, Feng
2015-09-21  5:09 Wu, Feng
2015-09-21  9:54 ` George Dunlap
2015-09-21 12:22   ` Wu, Feng
2015-09-21 14:24     ` Dario Faggioli
2015-09-22  7:19       ` Wu, Feng
2015-09-22  8:59         ` Jan Beulich
2015-09-22 13:40           ` Wu, Feng
2015-09-22 14:01             ` Jan Beulich
2015-09-23  9:44               ` George Dunlap
2015-09-23 12:35                 ` Wu, Feng
2015-09-23 15:25                   ` George Dunlap
2015-09-23 15:38                     ` Jan Beulich
2015-09-24  1:50                     ` Wu, Feng
2015-09-24  3:35                       ` Dario Faggioli
2015-09-24  7:51                       ` Jan Beulich
2015-09-24  8:03                         ` Wu, Feng
2015-09-22 10:26         ` George Dunlap
2015-09-23  6:35           ` Wu, Feng
2015-09-23  7:11             ` Dario Faggioli
2015-09-23  7:20               ` Wu, Feng

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