From: Christoph Hellwig <hch@infradead.org>
To: Jon Derrick <jonathan.derrick@intel.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
linux-pci@vger.kernel.org, qemu-devel@nongnu.org,
virtualization@lists.linux-foundation.org,
Bjorn Helgaas <helgaas@kernel.org>,
Andrzej Jakowski <andrzej.jakowski@intel.com>
Subject: Re: [PATCH 0/1] KVM support for VMD devices
Date: Wed, 22 Apr 2020 23:16:31 -0700 [thread overview]
Message-ID: <20200423061631.GA12688@infradead.org> (raw)
In-Reply-To: <20200422171444.10992-1-jonathan.derrick@intel.com>
On Wed, Apr 22, 2020 at 01:14:44PM -0400, Jon Derrick wrote:
> The two patches (Linux & QEMU) add support for passthrough VMD devices
> in QEMU/KVM. VMD device 28C0 already supports passthrough natively by
> providing the Host Physical Address in a shadow register to the guest
> for correct bridge programming.
>
> The QEMU patch emulates the 28C0 mode by creating a shadow register and
> advertising its support by using QEMU's subsystem vendor/id.
> The Linux patch matches the QEMU subsystem vendor/id to use the shadow
> register.
Please pick a different PCI ID for Qemu vs real hardware so that we
can properly quirk them if they end up behaving differently due to
hardware or software bugs.
next prev parent reply other threads:[~2020-04-23 6:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-22 17:14 [PATCH 0/1] KVM support for VMD devices Jon Derrick
2020-04-23 6:16 ` Christoph Hellwig [this message]
2020-04-23 15:18 ` Derrick, Jonathan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200423061631.GA12688@infradead.org \
--to=hch@infradead.org \
--cc=andrzej.jakowski@intel.com \
--cc=helgaas@kernel.org \
--cc=jonathan.derrick@intel.com \
--cc=linux-pci@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=qemu-devel@nongnu.org \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).