From: Jianxiong Gao <jxgao@google.com>
To: Greg KH <greg@kroah.com>
Cc: stable@vger.kernel.org, marcorr@google.com
Subject: Re: [PATCH v5.10 0/8] preserve DMA offsets when using swiotlb
Date: Mon, 26 Apr 2021 11:00:56 -0700 [thread overview]
Message-ID: <CAMGD6P3SY=BeXjKAajCiHXXRXzLMnDiPo8weagJVurY_Ew0T2w@mail.gmail.com> (raw)
In-Reply-To: <YIQupJuzbdgif6WA@kroah.com>
On Sat, Apr 24, 2021 at 7:43 AM Greg KH <greg@kroah.com> wrote:
> Ok, and what prevents you from adding this new feature do your "custom"
> kernel, or to use 5.12 instead?
>
> This is a new feature that Linux has never supported, and these patches
> are not "trivial" at all. I also do not see the maintainer of the
> subsystem agreeing that these are needed to be backported, which is not
> a good sign.
>
So this is not about a new feature. This is about an existing bug that
we stumbled onto while using SEV virtualization. However SEV is not
needed to trigger the bug. We have reproduced the bug with just
NVMe + SWIOTLB=force option in Rhel 8 environment. Please note
that NVMe and SWIOTLB=force are both existing feature and without
the patch they don't work together. This is why we are proposing to merge
the patches into the LTS kernels.
> So I recommend just using a newer kernel version, that way all will be
> good and no need to backport anything. What is preventing you from
> doing that today?
>
> thanks,
>
> greg k-h
--
Jianxiong Gao
next prev parent reply other threads:[~2021-04-26 18:01 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-05 21:02 [PATCH v5.10 0/8] preserve DMA offsets when using swiotlb Jianxiong Gao
2021-04-05 21:02 ` [PATCH v5.10 1/8] driver core: add a min_align_mask field to struct device_dma_parameters Jianxiong Gao
2021-04-07 12:50 ` Greg KH
2021-04-05 21:02 ` [PATCH v5.10 2/8] swiotlb: factor out an io_tlb_offset helper Jianxiong Gao
2021-04-05 21:02 ` [PATCH v5.10 3/8] swiotlb: factor out a nr_slots helper Jianxiong Gao
2021-04-05 21:02 ` [PATCH v5.10 4/8] swiotlb: clean up swiotlb_tbl_unmap_single Jianxiong Gao
2021-04-05 21:02 ` [PATCH v5.10 5/8] swiotlb: refactor swiotlb_tbl_map_single Jianxiong Gao
2021-04-05 21:02 ` [PATCH v5.10 6/8] swiotlb: don't modify orig_addr in swiotlb_tbl_sync_single Jianxiong Gao
2021-04-05 21:02 ` [PATCH v5.10 7/8] swiotlb: respect min_align_mask Jianxiong Gao
2021-04-05 21:02 ` [PATCH v5.10 8/8] nvme-pci: set min_align_mask Jianxiong Gao
2021-04-07 12:51 ` [PATCH v5.10 0/8] preserve DMA offsets when using swiotlb Greg KH
2021-04-20 23:38 ` Jianxiong Gao
2021-04-23 15:14 ` Greg KH
2021-04-23 17:28 ` Jianxiong Gao
2021-04-23 22:10 ` Jianxiong Gao
2021-04-23 22:33 ` Marc Orr
2021-04-24 14:43 ` Greg KH
2021-04-26 18:00 ` Jianxiong Gao [this message]
2021-04-28 16:18 ` Sasha Levin
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