From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2AA7CC77B75 for ; Tue, 18 Apr 2023 22:39:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232753AbjDRWjk (ORCPT ); Tue, 18 Apr 2023 18:39:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59284 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232681AbjDRWji (ORCPT ); Tue, 18 Apr 2023 18:39:38 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F2D39014 for ; Tue, 18 Apr 2023 15:38:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1681857527; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nt4NAlgjVn3bwVtb59HBkHnV8fhtHInS8+cCLwzW3Oo=; b=eplRB4EYd/BRVjPcXlKnIAmoU8v/IJ+6xjqeul0/TKtSP1b0uErY34i3/0cPcUYw/dvhll JOFBL4SyTn+1omPMUqHD1hgc60+fPXUTEU1u4VqLuYiP2EiZVkMjZ+fOPTsfCPrvUg6jgi 8rv7LeW1lA3uQ2eG1IxkSrUuucgqfpM= Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-449-z_2VSFFHPHOtmDLQ5vpnfg-1; Tue, 18 Apr 2023 18:38:45 -0400 X-MC-Unique: z_2VSFFHPHOtmDLQ5vpnfg-1 Received: by mail-io1-f71.google.com with SMTP id ca18e2360f4ac-760da06b86aso189465739f.0 for ; Tue, 18 Apr 2023 15:38:45 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681857525; x=1684449525; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=nt4NAlgjVn3bwVtb59HBkHnV8fhtHInS8+cCLwzW3Oo=; b=RxIBNnle6Ie8uqjT3BTCWQoCb/prEIqvHhYDOPz48IYv697HnUosK73YexfjHbiuWf jrL6ezdXC6qseP4ihYn57y/b5KqIF4R52cc9X6WjuPQJc15hz6v39SnxXLbGFJKk/tJO y4zjnKibC6kuWR6BF7lq3aIMYOG3RnXYbY7LKQIweSQpUJ9xqcm2NudT2TT9r4tX3lde ZSkOs3SjsojA6StLUDXcCo+zykRcB+IXEC1C+ZrWhHJ5gKN1fFINeO26y9wBU/QYILds YaZNNFKsLlNxsjahmBpotuZLbD3/g6UtGvH5V4AmR4UsoqOouWs0Aijz1yifKfhwfoqB NubA== X-Gm-Message-State: AAQBX9c9dV5HXv31JbjdMmrsYjUNfcfx+opEHXjpjMUE0NWKvHx1xDvA HsUVJbruUa06eE8nR8AChXIVpoy9iA3aDX4WFakE3yNEKRCNzrrzm41Nbzu1peBu0D1etewNh7L 04mhVwAblNzPIt1GnMPi0s0Gt X-Received: by 2002:a5d:80d6:0:b0:760:e9b6:e6da with SMTP id h22-20020a5d80d6000000b00760e9b6e6damr3037664ior.1.1681857525016; Tue, 18 Apr 2023 15:38:45 -0700 (PDT) X-Google-Smtp-Source: AKy350YI7seWtoBWPqYjT1RzndFBvuqrDODhMJ9id2vYXvKT4+TRs/PoewlgjvRH85jDeChhXC2tOQ== X-Received: by 2002:a5d:80d6:0:b0:760:e9b6:e6da with SMTP id h22-20020a5d80d6000000b00760e9b6e6damr3037642ior.1.1681857524746; Tue, 18 Apr 2023 15:38:44 -0700 (PDT) Received: from redhat.com ([38.15.36.239]) by smtp.gmail.com with ESMTPSA id x6-20020a5d9906000000b007079249a9d1sm4275565iol.34.2023.04.18.15.38.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Apr 2023 15:38:44 -0700 (PDT) Date: Tue, 18 Apr 2023 16:38:43 -0600 From: Alex Williamson To: Reinette Chatre Cc: jgg@nvidia.com, yishaih@nvidia.com, shameerali.kolothum.thodi@huawei.com, kevin.tian@intel.com, tglx@linutronix.de, darwi@linutronix.de, kvm@vger.kernel.org, dave.jiang@intel.com, jing2.liu@intel.com, ashok.raj@intel.com, fenghua.yu@intel.com, tom.zanussi@linux.intel.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH V3 10/10] vfio/pci: Clear VFIO_IRQ_INFO_NORESIZE for MSI-X Message-ID: <20230418163843.7b4c0366.alex.williamson@redhat.com> In-Reply-To: <6c057618833a180da2147bffadb98e07cb73e045.1681837892.git.reinette.chatre@intel.com> References: <6c057618833a180da2147bffadb98e07cb73e045.1681837892.git.reinette.chatre@intel.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.35; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 18 Apr 2023 10:29:21 -0700 Reinette Chatre wrote: > Dynamic MSI-X is supported. Clear VFIO_IRQ_INFO_NORESIZE > to provide guidance to user space. > > Signed-off-by: Reinette Chatre > --- > Changes since V2: > - Use new vdev->has_dyn_msix property instead of calling > pci_msix_can_alloc_dyn() directly. (Alex) > > Changes since RFC V1: > - Only advertise VFIO_IRQ_INFO_NORESIZE for MSI-X devices that > can actually support dynamic allocation. (Alex) > > drivers/vfio/pci/vfio_pci_core.c | 4 +++- > include/uapi/linux/vfio.h | 3 +++ > 2 files changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c > index a3635a8e54c8..4050ad3388c2 100644 > --- a/drivers/vfio/pci/vfio_pci_core.c > +++ b/drivers/vfio/pci/vfio_pci_core.c > @@ -1114,7 +1114,9 @@ static int vfio_pci_ioctl_get_irq_info(struct vfio_pci_core_device *vdev, > if (info.index == VFIO_PCI_INTX_IRQ_INDEX) > info.flags |= > (VFIO_IRQ_INFO_MASKABLE | VFIO_IRQ_INFO_AUTOMASKED); > - else > + else if ((info.index != VFIO_PCI_MSIX_IRQ_INDEX) || > + (info.index == VFIO_PCI_MSIX_IRQ_INDEX && > + !vdev->has_dyn_msix)) Isn't this the same as: (info.index != VFIO_PCI_MSIX_IRQ_INDEX || !vdev->has_dyn_msix) Thanks, Alex > info.flags |= VFIO_IRQ_INFO_NORESIZE; > > return copy_to_user(arg, &info, minsz) ? -EFAULT : 0; > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h > index 0552e8dcf0cb..1a36134cae5c 100644 > --- a/include/uapi/linux/vfio.h > +++ b/include/uapi/linux/vfio.h > @@ -511,6 +511,9 @@ struct vfio_region_info_cap_nvlink2_lnkspd { > * then add and unmask vectors, it's up to userspace to make the decision > * whether to allocate the maximum supported number of vectors or tear > * down setup and incrementally increase the vectors as each is enabled. > + * Absence of the NORESIZE flag indicates that vectors can be enabled > + * and disabled dynamically without impacting other vectors within the > + * index. > */ > struct vfio_irq_info { > __u32 argsz;