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Tue, 17 Mar 2020 22:58:28 +0000 (UTC) Received: from w520.home (ovpn-112-162.phx2.redhat.com [10.3.112.162]) by smtp.corp.redhat.com (Postfix) with ESMTP id 28DB75C1BB; Tue, 17 Mar 2020 22:58:22 +0000 (UTC) Date: Tue, 17 Mar 2020 16:58:22 -0600 From: Alex Williamson To: Peter Xu Subject: Re: [PATCH v3 5/5] Revert "vfio/pci: Disable INTx fast path if using split irqchip" Message-ID: <20200317165822.080a8dd3@w520.home> In-Reply-To: <20200317195042.282977-6-peterx@redhat.com> References: <20200317195042.282977-1-peterx@redhat.com> <20200317195042.282977-6-peterx@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 63.128.21.74 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Cornelia Huck , qemu-devel@nongnu.org, Eric Auger Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, 17 Mar 2020 15:50:42 -0400 Peter Xu wrote: > With the resamplefd list introduced, we can savely enable VFIO INTx > fast path again with split irqchip so it can still be faster than the > complete slow path. > > Reviewed-by: Eric Auger > Signed-off-by: Peter Xu > --- > hw/vfio/pci.c | 12 ------------ > 1 file changed, 12 deletions(-) Reviewed-by: Alex Williamson Acked-by: Alex Williamson > diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c > index 09703362df..1c0aa27386 100644 > --- a/hw/vfio/pci.c > +++ b/hw/vfio/pci.c > @@ -124,18 +124,6 @@ static void vfio_intx_enable_kvm(VFIOPCIDevice *vdev, Error **errp) > return; > } > > - if (kvm_irqchip_is_split()) { > - /* > - * VFIO INTx is currently not working with split kernel > - * irqchip for level triggered interrupts. Go the slow path > - * as long as split is enabled so we can be at least > - * functional (even with poor performance). > - * > - * TODO: Remove this after all things fixed up. > - */ > - return; > - } > - > /* Get to a known interrupt state */ > qemu_set_fd_handler(irq_fd, NULL, NULL, vdev); > vfio_mask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX);