From: "Michael S. Tsirkin" <mst@redhat.com>
To: Jason Wang <jasowang@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>,
virtualization <virtualization@lists.linux-foundation.org>,
"Eli Cohen" <eli@mellanox.com>, "Eric Blake" <eblake@redhat.com>,
"Eduardo Habkost" <ehabkost@redhat.com>,
"Cindy Lu" <lulu@redhat.com>,
"Fangyi (Eric)" <eric.fangyi@huawei.com>,
"Markus Armbruster" <armbru@redhat.com>,
yebiaoxiang@huawei.com, "Eugenio Pérez" <eperezma@redhat.com>,
Liuxiangdong <liuxiangdong5@huawei.com>,
"Laurent Vivier" <lvivier@redhat.com>,
"Parav Pandit" <parav@mellanox.com>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Gautam Dawar" <gdawar@xilinx.com>,
"Xiao W Wang" <xiao.w.wang@intel.com>,
"Stefan Hajnoczi" <stefanha@redhat.com>,
"Harpreet Singh Anand" <hanand@xilinx.com>,
Lingshan <lingshan.zhu@intel.com>
Subject: Re: [PATCH v5 00/15] vDPA shadow virtqueue
Date: Tue, 8 Mar 2022 05:48:20 -0500 [thread overview]
Message-ID: <20220308054623-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <CACGkMEsPBDM8ko1qgnCR1DcofPNJJo3S2j3pOJHk4xaSGQimcQ@mail.gmail.com>
On Tue, Mar 08, 2022 at 04:20:53PM +0800, Jason Wang wrote:
> > Not by itself but I'm not sure we can guarantee guest will not
> > attempt to use the IOVA addresses we are reserving down
> > the road.
>
> The IOVA is allocated via the listeners and stored in the iova tree
> per GPA range as IOVA->(GPA)->HVA.Guests will only see GPA, Qemu
> virtio core see GPA to HVA mapping. And we do a reverse lookup to find
> the HVA->IOVA we allocated previously. So we have double check here:
>
> 1) Qemu memory core to make sure the GPA that guest uses is valid
> 2) the IOVA tree that guarantees there will be no HVA beyond what
> guest can see is used
>
> So technically, there's no way for the guest to use the IOVA address
> allocated for the shadow virtqueue.
>
> Thanks
I mean, IOVA is programmed in the host hardware to translate to HPA, right?
--
MST
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next prev parent reply other threads:[~2022-03-08 10:48 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220307153334.3854134-1-eperezma@redhat.com>
2022-03-08 6:03 ` [PATCH v5 00/15] vDPA shadow virtqueue Jason Wang
2022-03-08 7:11 ` Michael S. Tsirkin
2022-03-08 7:14 ` Jason Wang
2022-03-08 7:27 ` Michael S. Tsirkin
2022-03-08 7:34 ` Jason Wang
2022-03-08 7:55 ` Michael S. Tsirkin
[not found] ` <CAJaqyWd4JKtxDAPqziZomKr3=H+f=jBEXgv3=Ju8vS6kqjjZkg@mail.gmail.com>
2022-03-08 8:19 ` Michael S. Tsirkin
2022-03-08 8:20 ` Jason Wang
2022-03-08 10:46 ` Michael S. Tsirkin
2022-03-08 13:23 ` Jason Wang
2022-03-08 10:48 ` Michael S. Tsirkin [this message]
[not found] ` <CAJaqyWcuitG+01pjO__tYERN9910fL_JGiHG88xU=fTG3KmpJw@mail.gmail.com>
2022-03-08 12:16 ` Michael S. Tsirkin
2022-03-09 3:38 ` Jason Wang
2022-03-09 7:30 ` Michael S. Tsirkin
2022-03-09 7:45 ` Jason Wang
[not found] ` <20220307153334.3854134-16-eperezma@redhat.com>
2022-03-08 7:11 ` [PATCH v5 15/15] vdpa: Add x-svq to NetdevVhostVDPAOptions Michael S. Tsirkin
[not found] ` <CAJaqyWewPYVPDOYTgKs03-LyfMHWkE+OR6tBEQ25rZ3YZmTrsw@mail.gmail.com>
2022-03-08 8:02 ` Michael S. Tsirkin
[not found] ` <CAJaqyWeAxjOtvtAD2Ow2MUXQpaBUbP21=CZ4g-S0pPizq_Az-g@mail.gmail.com>
2022-03-08 12:31 ` Michael S. Tsirkin
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