linux-kernel - [PATCH V2 0/2] x86/hyperv/Swiotlb: Add swiotlb_set_alloc_from_low

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Date:   Wed,  9 Feb 2022 07:23:00 -0500
From:   Tianyu Lan <ltykernel@...il.com>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, hch@...radead.org,
        m.szyprowski@...sung.com, robin.murphy@....com,
        michael.h.kelley@...rosoft.com
Cc:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, vkuznets@...hat.com,
        brijesh.singh@....com, konrad.wilk@...cle.com, hch@....de,
        parri.andrea@...il.com, thomas.lendacky@....com
Subject: [PATCH V2 0/2] x86/hyperv/Swiotlb: Add swiotlb_set_alloc_from_low_pages() switch function.

From: Tianyu Lan <Tianyu.Lan@...rosoft.com>

Hyper-V Isolation VM may fail to allocate swiotlb bounce buffer due
to there is no enough contiguous memory from 0 to 4G in some cases.
Current swiotlb code allocates bounce buffer in the low end memory.
This patchset adds a new function swiotlb_set_alloc_from_low_pages()
to control swiotlb bounce buffer from low pages or no limitation.
Devices in Hyper-V Isolation VM may use memory above 4G as DMA memory
and switch swiotlb allocation in order to avoid no enough contiguous
memory in low pages.

Tianyu Lan (2):
  Swiotlb: Add swiotlb_alloc_from_low_pages switch
  x86/hyperv: Make swiotlb bounce buffer allocation not just from low
    pages

 arch/x86/kernel/cpu/mshyperv.c |  1 +
 include/linux/swiotlb.h        |  1 +
 kernel/dma/swiotlb.c           | 18 ++++++++++++++++--
 3 files changed, 18 insertions(+), 2 deletions(-)

-- 
2.25.1