linux-kernel - Re: [PATCH V2 1/2] Swiotlb: Add swiotlb_alloc_from_low

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Date:   Tue, 22 Feb 2022 17:00:39 +0100
From:   Christoph Hellwig <hch@....de>
To:     Tianyu Lan <ltykernel@...il.com>
Cc:     Christoph Hellwig <hch@....de>, 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,
        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,
        parri.andrea@...il.com, thomas.lendacky@....com
Subject: Re: [PATCH V2 1/2] Swiotlb: Add swiotlb_alloc_from_low_pages switch

On Tue, Feb 22, 2022 at 11:07:19PM +0800, Tianyu Lan wrote:
> Thanks for your comment. That means we need to expose an 
> swiotlb_device_init() interface to allocate bounce buffer and initialize
> io tlb mem entry. DMA API Current  rmem_swiotlb_device_init() only works
> for platform with device tree. The new API should be called in the bus
> driver or new DMA API. Could you check whether this is a right way before 
> we start the work.

Do these VMs use ACPI?  We'd probably really want some kind of higher
level configuration and not have the drivers request it themselves.