From: Cornelia Huck <cohuck@redhat.com>
To: Matthew Rosato <mjrosato@linux.ibm.com>
Cc: thuth@redhat.com, kvm@vger.kernel.org, pmorel@linux.ibm.com,
david@redhat.com, schnelle@linux.ibm.com, qemu-s390x@nongnu.org,
qemu-devel@nongnu.org, pasic@linux.ibm.com,
borntraeger@de.ibm.com, alex.williamson@redhat.com,
mst@redhat.com, pbonzini@redhat.com, philmd@redhat.com,
rth@twiddle.net
Subject: Re: [PATCH v4 5/5] s390x/pci: Honor DMA limits set by vfio
Date: Tue, 22 Sep 2020 12:16:50 +0200 [thread overview]
Message-ID: <20200922121650.1bdd0ea6.cohuck@redhat.com> (raw)
In-Reply-To: <1600352445-21110-6-git-send-email-mjrosato@linux.ibm.com>
On Thu, 17 Sep 2020 10:20:45 -0400
Matthew Rosato <mjrosato@linux.ibm.com> wrote:
> When an s390 guest is using lazy unmapping, it can result in a very
> large number of oustanding DMA requests, far beyond the default
> limit configured for vfio. Let's track DMA usage similar to vfio
> in the host, and trigger the guest to flush their DMA mappings
> before vfio runs out.
>
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
> hw/s390x/s390-pci-bus.c | 16 +++++++++++-----
> hw/s390x/s390-pci-bus.h | 9 +++++++++
> hw/s390x/s390-pci-inst.c | 45 +++++++++++++++++++++++++++++++++++++++------
> hw/s390x/s390-pci-inst.h | 3 +++
> hw/s390x/s390-pci-vfio.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> hw/s390x/s390-pci-vfio.h | 5 +++++
> 6 files changed, 109 insertions(+), 11 deletions(-)
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
next prev parent reply other threads:[~2020-09-22 10:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-17 14:20 [PATCH v4 0/5] s390x/pci: Accomodate vfio DMA limiting Matthew Rosato
2020-09-17 14:20 ` [PATCH v4 1/5] linux-headers: update against 5.9-rc5 Matthew Rosato
2020-09-17 14:20 ` [PATCH v4 2/5] vfio: Create shared routine for scanning info capabilities Matthew Rosato
2020-09-17 14:20 ` [PATCH v4 3/5] vfio: Find DMA available capability Matthew Rosato
2020-09-17 14:20 ` [PATCH v4 4/5] s390x/pci: Add routine to get the vfio dma available count Matthew Rosato
2020-09-22 10:12 ` Cornelia Huck
2020-09-17 14:20 ` [PATCH v4 5/5] s390x/pci: Honor DMA limits set by vfio Matthew Rosato
2020-09-22 10:16 ` Cornelia Huck [this message]
2020-09-17 14:46 ` [PATCH v4 0/5] s390x/pci: Accomodate vfio DMA limiting no-reply
2020-09-17 15:05 ` Matthew Rosato
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