From: Christoph Hellwig <hch@lst.de>
To: Roman Kisel <romank@linux.microsoft.com>
Cc: aleksander.lobakin@intel.com, andriy.shevchenko@linux.intel.com,
arnd@arndb.de, bp@alien8.de, catalin.marinas@arm.com,
corbet@lwn.net, dakr@kernel.org, dan.j.williams@intel.com,
dave.hansen@linux.intel.com, decui@microsoft.com,
gregkh@linuxfoundation.org, haiyangz@microsoft.com, hch@lst.de,
hpa@zytor.com, James.Bottomley@HansenPartnership.com,
Jonathan.Cameron@huawei.com, kys@microsoft.com, leon@kernel.org,
lukas@wunner.de, luto@kernel.org, m.szyprowski@samsung.com,
martin.petersen@oracle.com, mingo@redhat.com,
peterz@infradead.org, quic_zijuhu@quicinc.com,
robin.murphy@arm.com, tglx@linutronix.de, wei.liu@kernel.org,
will@kernel.org, iommu@lists.linux.dev,
linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-doc@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
x86@kernel.org, apais@microsoft.com, benhill@microsoft.com,
bperkins@microsoft.com, sunilmut@microsoft.com
Subject: Re: [PATCH hyperv-next 5/6] arch, drivers: Add device struct bitfield to not bounce-buffer
Date: Wed, 9 Apr 2025 12:52:29 +0200 [thread overview]
Message-ID: <20250409105229.GA5721@lst.de> (raw)
In-Reply-To: <20250409000835.285105-6-romank@linux.microsoft.com>
On Tue, Apr 08, 2025 at 05:08:34PM -0700, Roman Kisel wrote:
> Bounce-buffering makes the system spend more time copying
> I/O data. When the I/O transaction take place between
> a confidential and a non-confidential endpoints, there is
> no other way around.
>
> Introduce a device bitfield to indicate that the device
> doesn't need to perform bounce buffering. The capable
> device may employ it to save on copying data around.
I have no idea what this is supposed to mean, you need to explain it
much better.
next prev parent reply other threads:[~2025-04-09 10:52 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-09 0:08 [PATCH hyperv-next 0/6] Confidential VMBus Roman Kisel
2025-04-09 0:08 ` [PATCH hyperv-next 1/6] Documentation: hyperv: " Roman Kisel
2025-04-10 16:54 ` ALOK TIWARI
2025-04-10 19:10 ` Roman Kisel
2025-04-25 6:31 ` Wei Liu
2025-04-09 0:08 ` [PATCH hyperv-next 2/6] drivers: hyperv: VMBus protocol version 6.0 Roman Kisel
2025-04-10 17:03 ` ALOK TIWARI
2025-04-09 0:08 ` [PATCH hyperv-next 3/6] arch: hyperv: Get/set SynIC synth.registers via paravisor Roman Kisel
2025-04-09 0:08 ` [PATCH hyperv-next 4/6] arch: x86, drivers: hyperv: Enable confidential VMBus Roman Kisel
2025-04-09 0:08 ` [PATCH hyperv-next 5/6] arch, drivers: Add device struct bitfield to not bounce-buffer Roman Kisel
2025-04-09 10:52 ` Christoph Hellwig [this message]
2025-04-09 15:27 ` Roman Kisel
2025-04-09 16:03 ` Robin Murphy
2025-04-09 16:44 ` Roman Kisel
2025-04-09 23:30 ` Dan Williams
2025-04-10 1:16 ` Michael Kelley
2025-04-11 0:03 ` Dan Williams
2025-04-10 7:23 ` Christoph Hellwig
2025-04-10 23:44 ` Jason Gunthorpe
2025-04-10 23:50 ` Jason Gunthorpe
2025-04-10 7:21 ` Christoph Hellwig
2025-04-10 15:16 ` Roman Kisel
2025-04-09 0:08 ` [PATCH hyperv-next 6/6] drivers: SCSI: Do not bounce-bufffer for the confidential VMBus Roman Kisel
2025-04-09 10:53 ` Christoph Hellwig
2025-04-09 15:36 ` Roman Kisel
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