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Message-ID: <53bdf85f-8c29-7843-7ccd-88432e66b282@uni-rostock.de>
Date:   Wed, 27 Jul 2022 22:28:25 +0200
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Subject: Re: [PATCH v2] um: read multiple msg from virtio slave request fd
Content-Language: de-DE
To:     Richard Weinberger <richard@nod.at>,
        Anton Ivanov <anton.ivanov@cambridgegreys.com>,
        Johannes Berg <johannes@sipsolutions.net>
CC:     Johannes Berg <johannes.berg@intel.com>,
        <linux-um@lists.infradead.org>, <linux-kernel@vger.kernel.org>
References: <20220607112714.516408-1-benjamin.beichler@uni-rostock.de>
From:   Benjamin Beichler <Benjamin.Beichler@uni-rostock.de>
Organization: =?UTF-8?Q?Universit=c3=a4t_Rostock?=
In-Reply-To: <20220607112714.516408-1-benjamin.beichler@uni-rostock.de>
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Are there any issues with that patch=3F
I would be happy to receive any comments or an acceptance :-D

Sorry for my former HTML-Email.

kind regards

Benjamin


Am 07.06.2022 um 13:27 schrieb Benjamin Beichler:
> If VHOST=5FUSER=5FPROTOCOL=5FF=5FINBAND=5FNOTIFICATIONS is activated, the us=
er mode
> linux virtio irq handler only read one msg from the corresponding socket.
> This creates issues, when the device emulation creates multiple call
> requests (e.g. for multiple virtqueues), as the socket buffer tend to fill
> up and the call requests are delayed.
>
> This creates a deadlock situation, when the device simulation blocks,
> because of sending a msg and the kernel side blocks because of
> synchronously waiting for an acknowledge of kick request.
>
> Actually inband notifications are meant to be used in combination with the
> time travel protocol, but it is not required, therefore this corner case
> needs to be handled.
>
> Anyways, in general it seems to be more natural to consume always all
> messages from a socket, instead of only a single one.
>
> Fixes: 2cd097ba8c05 ("um: virtio: Implement VHOST=5FUSER=5FPROTOCOL=5FF=5FSL=
AVE=5FREQ")
> Signed-off-by: Benjamin Beichler <benjamin.beichler@uni-rostock.de>
> ---
>   arch/um/drivers/virtio=5Fuml.c | 71 +++++++++++++++++++-----------------
>   1 file changed, 37 insertions(+), 34 deletions(-)
>
> diff --git a/arch/um/drivers/virtio=5Fuml.c b/arch/um/drivers/virtio=5Fuml.c
> index 82ff3785bf69..3716c5f6f9aa 100644
> --- a/arch/um/drivers/virtio=5Fuml.c
> +++ b/arch/um/drivers/virtio=5Fuml.c
> @@ -374,45 +374,48 @@ static irqreturn=5Ft vu=5Freq=5Fread=5Fmessage(struct =
virtio=5Fuml=5Fdevice *vu=5Fdev,
>   =09=09u8 extra=5Fpayload[512];
>   =09} msg;
>   =09int rc;
> +=09irqreturn=5Ft irq=5Frc =3D IRQ=5FNONE;
>   
> -=09rc =3D vhost=5Fuser=5Frecv=5Freq(vu=5Fdev, &msg.msg,
> -=09=09=09=09 sizeof(msg.msg.payload) +
> -=09=09=09=09 sizeof(msg.extra=5Fpayload));
> -
> -=09vu=5Fdev->recv=5Frc =3D rc;
> -=09if (rc)
> -=09=09return IRQ=5FNONE;
> -
> -=09switch (msg.msg.header.request) {
> -=09case VHOST=5FUSER=5FSLAVE=5FCONFIG=5FCHANGE=5FMSG:
> -=09=09vu=5Fdev->config=5Fchanged=5Firq =3D true;
> -=09=09response =3D 0;
> -=09=09break;
> -=09case VHOST=5FUSER=5FSLAVE=5FVRING=5FCALL:
> -=09=09virtio=5Fdevice=5Ffor=5Feach=5Fvq((&vu=5Fdev->vdev), vq) {
> -=09=09=09if (vq->index =3D=3D msg.msg.payload.vring=5Fstate.index) {
> -=09=09=09=09response =3D 0;
> -=09=09=09=09vu=5Fdev->vq=5Firq=5Fvq=5Fmap |=3D BIT=5FULL(vq->index);
> -=09=09=09=09break;
> +=09while (1) {
> +=09=09rc =3D vhost=5Fuser=5Frecv=5Freq(vu=5Fdev, &msg.msg,
> +=09=09=09=09=09 sizeof(msg.msg.payload) +
> +=09=09=09=09=09 sizeof(msg.extra=5Fpayload));
> +=09=09if (rc)
> +=09=09=09break;
> +
> +=09=09switch (msg.msg.header.request) {
> +=09=09case VHOST=5FUSER=5FSLAVE=5FCONFIG=5FCHANGE=5FMSG:
> +=09=09=09vu=5Fdev->config=5Fchanged=5Firq =3D true;
> +=09=09=09response =3D 0;
> +=09=09=09break;
> +=09=09case VHOST=5FUSER=5FSLAVE=5FVRING=5FCALL:
> +=09=09=09virtio=5Fdevice=5Ffor=5Feach=5Fvq((&vu=5Fdev->vdev), vq) {
> +=09=09=09=09if (vq->index =3D=3D msg.msg.payload.vring=5Fstate.index) {
> +=09=09=09=09=09response =3D 0;
> +=09=09=09=09=09vu=5Fdev->vq=5Firq=5Fvq=5Fmap |=3D BIT=5FULL(vq->index);
> +=09=09=09=09=09break;
> +=09=09=09=09}
>   =09=09=09}
> +=09=09=09break;
> +=09=09case VHOST=5FUSER=5FSLAVE=5FIOTLB=5FMSG:
> +=09=09=09/* not supported - VIRTIO=5FF=5FACCESS=5FPLATFORM */
> +=09=09case VHOST=5FUSER=5FSLAVE=5FVRING=5FHOST=5FNOTIFIER=5FMSG:
> +=09=09=09/* not supported - VHOST=5FUSER=5FPROTOCOL=5FF=5FHOST=5FNOTIFIER *=
/
> +=09=09default:
> +=09=09=09vu=5Ferr(vu=5Fdev, "unexpected slave request %d\n",
> +=09=09=09       msg.msg.header.request);
>   =09=09}
> -=09=09break;
> -=09case VHOST=5FUSER=5FSLAVE=5FIOTLB=5FMSG:
> -=09=09/* not supported - VIRTIO=5FF=5FACCESS=5FPLATFORM */
> -=09case VHOST=5FUSER=5FSLAVE=5FVRING=5FHOST=5FNOTIFIER=5FMSG:
> -=09=09/* not supported - VHOST=5FUSER=5FPROTOCOL=5FF=5FHOST=5FNOTIFIER */
> -=09default:
> -=09=09vu=5Ferr(vu=5Fdev, "unexpected slave request %d\n",
> -=09=09       msg.msg.header.request);
> -=09}
> -
> -=09if (ev && !vu=5Fdev->suspended)
> -=09=09time=5Ftravel=5Fadd=5Firq=5Fevent(ev);
>   
> -=09if (msg.msg.header.flags & VHOST=5FUSER=5FFLAG=5FNEED=5FREPLY)
> -=09=09vhost=5Fuser=5Freply(vu=5Fdev, &msg.msg, response);
> +=09=09if (ev && !vu=5Fdev->suspended)
> +=09=09=09time=5Ftravel=5Fadd=5Firq=5Fevent(ev);
>   
> -=09return IRQ=5FHANDLED;
> +=09=09if (msg.msg.header.flags & VHOST=5FUSER=5FFLAG=5FNEED=5FREPLY)
> +=09=09=09vhost=5Fuser=5Freply(vu=5Fdev, &msg.msg, response);
> +=09=09irq=5Frc =3D IRQ=5FHANDLED;
> +=09};
> +=09/* mask EAGAIN as we try non-blocking read until socket is empty */
> +=09vu=5Fdev->recv=5Frc =3D (rc =3D=3D -EAGAIN) =3F 0 : rc;
> +=09return irq=5Frc;
>   }
>   
>   static irqreturn=5Ft vu=5Freq=5Finterrupt(int irq, void *data)


-- 
M.Sc. Benjamin Beichler

Universit=C3=A4t Rostock, Fakult=C3=A4t f=C3=BCr Informatik und Elektrotechnik
Institut f=C3=BCr Angewandte Mikroelektronik und Datentechnik

University of Rostock, Department of CS and EE
Institute of Applied Microelectronics and CE

Richard-Wagner-Stra=C3=9Fe 31
18119 Rostock
Deutschland/Germany

phone: +49 (0) 381 498 - 7278
email: Benjamin.Beichler@uni-rostock.de
www: http://www.imd.uni-rostock.de/

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