From: Christoph Hellwig <hch@lst.de>
To: Tianyu Lan <ltykernel@gmail.com>
Cc: kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com,
dave.hansen@linux.intel.com, luto@kernel.org,
peterz@infradead.org, konrad.wilk@oracle.com,
boris.ostrovsky@oracle.com, jgross@suse.com,
sstabellini@kernel.org, joro@8bytes.org, davem@davemloft.net,
kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com,
gregkh@linuxfoundation.org, arnd@arndb.de, hch@lst.de,
m.szyprowski@samsung.com, robin.murphy@arm.com,
brijesh.singh@amd.com, thomas.lendacky@amd.com,
Tianyu.Lan@microsoft.com, pgonda@google.com,
martin.b.radev@gmail.com, akpm@linux-foundation.org,
kirill.shutemov@linux.intel.com, rppt@kernel.org,
hannes@cmpxchg.org, aneesh.kumar@linux.ibm.com,
krish.sadhukhan@oracle.com, saravanand@fb.com,
linux-arm-kernel@lists.infradead.org,
xen-devel@lists.xenproject.org, rientjes@google.com,
ardb@kernel.org, michael.h.kelley@microsoft.com,
iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-scsi@vger.kernel.org, netdev@vger.kernel.org,
vkuznets@redhat.com, parri.andrea@gmail.com,
dave.hansen@intel.com
Subject: Re: [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support
Date: Mon, 30 Aug 2021 14:00:36 +0200 [thread overview]
Message-ID: <20210830120036.GA22005@lst.de> (raw)
In-Reply-To: <20210827172114.414281-1-ltykernel@gmail.com>
Sorry for the delayed answer, but I look at the vmap_pfn usage in the
previous version and tried to come up with a better version. This
mostly untested branch:
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/hyperv-vmap
get us there for swiotlb and the channel infrastructure I've started
looking at the network driver and didn't get anywhere due to other work.
As far as I can tell the network driver does gigantic multi-megabyte
vmalloc allocation for the send and receive buffers, which are then
passed to the hardware, but always copied to/from when interacting
with the networking stack. Did I see that right? Are these big
buffers actually required unlike the normal buffer management schemes
in other Linux network drivers?
If so I suspect the best way to allocate them is by not using vmalloc
but just discontiguous pages, and then use kmap_local_pfn where the
PFN includes the share_gpa offset when actually copying from/to the
skbs.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Tianyu Lan <ltykernel@gmail.com>
Cc: parri.andrea@gmail.com, linux-hyperv@vger.kernel.org,
brijesh.singh@amd.com, peterz@infradead.org,
catalin.marinas@arm.com, dave.hansen@linux.intel.com,
dave.hansen@intel.com, netdev@vger.kernel.org, hpa@zytor.com,
kys@microsoft.com, will@kernel.org, boris.ostrovsky@oracle.com,
linux-arch@vger.kernel.org, wei.liu@kernel.org,
sstabellini@kernel.org, sthemmin@microsoft.com,
xen-devel@lists.xenproject.org, linux-scsi@vger.kernel.org,
aneesh.kumar@linux.ibm.com, x86@kernel.org, decui@microsoft.com,
hch@lst.de, michael.h.kelley@microsoft.com, mingo@redhat.com,
pgonda@google.com, rientjes@google.com, kuba@kernel.org,
jejb@linux.ibm.com, martin.b.radev@gmail.com,
thomas.lendacky@amd.com, Tianyu.Lan@microsoft.com, arnd@arndb.de,
konrad.wilk@oracle.com, haiyangz@microsoft.com, bp@alien8.de,
luto@kernel.org, krish.sadhukhan@oracle.com, tglx@linutronix.de,
vkuznets@redhat.com, linux-arm-kernel@lists.infradead.org,
jgross@suse.com, martin.petersen@oracle.com, saravanand@fb.com,
gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org, rppt@kernel.org,
hannes@cmpxchg.org, ardb@kernel.org, akpm@linux-foundation.org,
robin.murphy@arm.com, davem@davemloft.net,
kirill.shutemov@linux.intel.com
Subject: Re: [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support
Date: Mon, 30 Aug 2021 14:00:36 +0200 [thread overview]
Message-ID: <20210830120036.GA22005@lst.de> (raw)
In-Reply-To: <20210827172114.414281-1-ltykernel@gmail.com>
Sorry for the delayed answer, but I look at the vmap_pfn usage in the
previous version and tried to come up with a better version. This
mostly untested branch:
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/hyperv-vmap
get us there for swiotlb and the channel infrastructure I've started
looking at the network driver and didn't get anywhere due to other work.
As far as I can tell the network driver does gigantic multi-megabyte
vmalloc allocation for the send and receive buffers, which are then
passed to the hardware, but always copied to/from when interacting
with the networking stack. Did I see that right? Are these big
buffers actually required unlike the normal buffer management schemes
in other Linux network drivers?
If so I suspect the best way to allocate them is by not using vmalloc
but just discontiguous pages, and then use kmap_local_pfn where the
PFN includes the share_gpa offset when actually copying from/to the
skbs.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2021-08-30 12:01 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-27 17:20 [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-08-27 17:20 ` Tianyu Lan
2021-08-27 17:20 ` [PATCH V4 01/13] x86/hyperv: Initialize GHCB page in Isolation VM Tianyu Lan
2021-08-27 17:20 ` Tianyu Lan
2021-09-02 0:15 ` Michael Kelley
2021-09-02 0:15 ` Michael Kelley via iommu
2021-08-27 17:21 ` [PATCH V4 02/13] x86/hyperv: Initialize shared memory boundary in the " Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-09-02 0:15 ` Michael Kelley
2021-09-02 0:15 ` Michael Kelley via iommu
2021-09-02 6:35 ` Tianyu Lan
2021-09-02 6:35 ` Tianyu Lan
2021-08-27 17:21 ` [PATCH V4 03/13] x86/hyperv: Add new hvcall guest address host visibility support Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-09-02 0:16 ` Michael Kelley
2021-09-02 0:16 ` Michael Kelley via iommu
2021-08-27 17:21 ` [PATCH V4 04/13] hyperv: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-08-27 17:41 ` Greg KH
2021-08-27 17:41 ` Greg KH
2021-08-27 17:44 ` Tianyu Lan
2021-08-27 17:44 ` Tianyu Lan
2021-09-02 0:17 ` Michael Kelley
2021-09-02 0:17 ` Michael Kelley via iommu
2021-08-27 17:21 ` [PATCH V4 05/13] hyperv: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-08-27 17:41 ` Greg KH
2021-08-27 17:41 ` Greg KH
2021-08-27 17:46 ` Tianyu Lan
2021-08-27 17:46 ` Tianyu Lan
2021-09-02 3:32 ` Michael Kelley
2021-09-02 3:32 ` Michael Kelley via iommu
2021-08-27 17:21 ` [PATCH V4 06/13] hyperv: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-09-02 0:20 ` Michael Kelley
2021-09-02 0:20 ` Michael Kelley via iommu
2021-08-27 17:21 ` [PATCH V4 07/13] hyperv/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-09-02 0:21 ` Michael Kelley
2021-09-02 0:21 ` Michael Kelley via iommu
2021-08-27 17:21 ` [PATCH V4 08/13] hyperv/vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-09-02 0:23 ` Michael Kelley
2021-09-02 0:23 ` Michael Kelley via iommu
2021-09-02 13:35 ` Tianyu Lan
2021-09-02 13:35 ` Tianyu Lan
2021-09-02 16:14 ` Michael Kelley
2021-09-02 16:14 ` Michael Kelley via iommu
2021-08-27 17:21 ` [PATCH V4 09/13] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-08-27 17:21 ` [PATCH V4 10/13] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-08-27 17:21 ` [PATCH V4 11/13] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-09-02 1:27 ` Michael Kelley
2021-09-02 1:27 ` Michael Kelley via iommu
2021-08-27 17:21 ` [PATCH V4 12/13] hv_netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-09-02 2:34 ` Michael Kelley
2021-09-02 2:34 ` Michael Kelley via iommu
2021-09-02 4:56 ` Michael Kelley
2021-09-02 4:56 ` Michael Kelley via iommu
2021-08-27 17:21 ` [PATCH V4 13/13] hv_storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-08-27 17:21 ` Tianyu Lan
2021-09-02 2:08 ` Michael Kelley
2021-09-02 2:08 ` Michael Kelley via iommu
2021-08-30 12:00 ` Christoph Hellwig [this message]
2021-08-30 12:00 ` [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Christoph Hellwig
2021-08-31 15:20 ` Tianyu Lan
2021-08-31 15:20 ` Tianyu Lan
2021-09-02 7:51 ` Christoph Hellwig
2021-09-02 7:51 ` Christoph Hellwig
2021-08-31 17:16 ` Michael Kelley
2021-08-31 17:16 ` Michael Kelley via iommu
2021-09-02 7:59 ` Christoph Hellwig
2021-09-02 7:59 ` Christoph Hellwig
2021-09-02 11:21 ` Tianyu Lan
2021-09-02 11:21 ` Tianyu Lan
2021-09-02 15:57 ` Michael Kelley
2021-09-02 15:57 ` Michael Kelley via iommu
2021-09-14 14:41 ` Tianyu Lan
2021-09-14 14:41 ` Tianyu Lan
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=20210830120036.GA22005@lst.de \
--to=hch@lst.de \
--cc=Tianyu.Lan@microsoft.com \
--cc=akpm@linux-foundation.org \
--cc=aneesh.kumar@linux.ibm.com \
--cc=ardb@kernel.org \
--cc=arnd@arndb.de \
--cc=boris.ostrovsky@oracle.com \
--cc=bp@alien8.de \
--cc=brijesh.singh@amd.com \
--cc=catalin.marinas@arm.com \
--cc=dave.hansen@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=davem@davemloft.net \
--cc=decui@microsoft.com \
--cc=gregkh@linuxfoundation.org \
--cc=haiyangz@microsoft.com \
--cc=hannes@cmpxchg.org \
--cc=hpa@zytor.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jejb@linux.ibm.com \
--cc=jgross@suse.com \
--cc=joro@8bytes.org \
--cc=kirill.shutemov@linux.intel.com \
--cc=konrad.wilk@oracle.com \
--cc=krish.sadhukhan@oracle.com \
--cc=kuba@kernel.org \
--cc=kys@microsoft.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-hyperv@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=ltykernel@gmail.com \
--cc=luto@kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=martin.b.radev@gmail.com \
--cc=martin.petersen@oracle.com \
--cc=michael.h.kelley@microsoft.com \
--cc=mingo@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=parri.andrea@gmail.com \
--cc=peterz@infradead.org \
--cc=pgonda@google.com \
--cc=rientjes@google.com \
--cc=robin.murphy@arm.com \
--cc=rppt@kernel.org \
--cc=saravanand@fb.com \
--cc=sstabellini@kernel.org \
--cc=sthemmin@microsoft.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=vkuznets@redhat.com \
--cc=wei.liu@kernel.org \
--cc=will@kernel.org \
--cc=x86@kernel.org \
--cc=xen-devel@lists.xenproject.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.