linux-kernel - RE: [PATCH v3 6/6] PCI: hv: fix 2 hang issues in hv_compose_msi

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Message-ID: <BL0PR2101MB11087BE0B3B91040BE99EF5ACADE0@BL0PR2101MB1108.namprd21.prod.outlook.com>
Date:   Fri, 9 Mar 2018 19:38:10 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Dexuan Cui <decui@...rosoft.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "driverdev-devel@...uxdriverproject.org" 
        <driverdev-devel@...uxdriverproject.org>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Jack Morgenstein <jackm@...lanox.com>
Subject: RE: [PATCH v3 6/6] PCI: hv: fix 2 hang issues in hv_compose_msi_msg()



> -----Original Message-----
> From: Dexuan Cui
> Sent: Tuesday, March 6, 2018 1:22 PM
> To: bhelgaas@...gle.com; linux-pci@...r.kernel.org; KY Srinivasan
> <kys@...rosoft.com>; Stephen Hemminger <sthemmin@...rosoft.com>;
> olaf@...fle.de; apw@...onical.com; jasowang@...hat.com
> Cc: linux-kernel@...r.kernel.org; driverdev-devel@...uxdriverproject.org;
> Haiyang Zhang <haiyangz@...rosoft.com>; vkuznets@...hat.com;
> marcelo.cerri@...onical.com; Michael Kelley (EOSG)
> <Michael.H.Kelley@...rosoft.com>; Dexuan Cui <decui@...rosoft.com>;
> stable@...r.kernel.org; Jack Morgenstein <jackm@...lanox.com>
> Subject: [PATCH v3 6/6] PCI: hv: fix 2 hang issues in hv_compose_msi_msg()
> 
> 1. With the patch "x86/vector/msi: Switch to global reservation mode"
> (4900be8360), the recent v4.15 and newer kernels always hang for 1-vCPU
> Hyper-V VM with SR-IOV. This is because when we reach
> hv_compose_msi_msg() by request_irq()  -> request_threaded_irq() ->
> __setup_irq()->irq_startup()  -> __irq_startup() -> irq_domain_activate_irq() -
> > ... ->
> msi_domain_activate() -> ... -> hv_compose_msi_msg(), local irq is disabled in
> __setup_irq().
> 
> Fix this by polling the channel.
> 
> 2. If the host is ejecting the VF device before we reach hv_compose_msi_msg(),
> in a UP VM, we can hang in hv_compose_msi_msg() forever, because at this
> time the host doesn't respond to the CREATE_INTERRUPT request. This issue
> also happens to old kernels like v4.14, v4.13, etc.
> 
> Fix this by polling the channel for the PCI_EJECT message and
> hpdev->state, and by checking the PCI vendor ID.
> 
> Note: actually the above issues also happen to a SMP VM, if "hbus->hdev-
> >channel->target_cpu == smp_processor_id()" is true.
> 
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> Tested-by: Adrian Suhov <v-adsuho@...rosoft.com>
> Tested-by: Chris Valean <v-chvale@...rosoft.com>
> Cc: stable@...r.kernel.org
> Cc: Stephen Hemminger <sthemmin@...rosoft.com>
> Cc: K. Y. Srinivasan <kys@...rosoft.com>
> Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
> Cc: Jack Morgenstein <jackm@...lanox.com>
> ---

Acked-by: Haiyang Zhang <haiyangz@...rosoft.com>