linux-kernel - Re: [PATCH 0/3] Fix virtio-blk issue with SWIOTLB

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Message-ID: <20190115083742.GF5825@8bytes.org>
Date:   Tue, 15 Jan 2019 09:37:42 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Jason Wang <jasowang@...hat.com>, Christoph Hellwig <hch@....de>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Jens Axboe <axboe@...nel.dk>,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, jfehlig@...e.com,
        jon.grimm@....com, brijesh.singh@....com
Subject: Re: [PATCH 0/3] Fix virtio-blk issue with SWIOTLB

On Mon, Jan 14, 2019 at 01:20:45PM -0500, Michael S. Tsirkin wrote:
> Which would be fine especially if we can manage not to introduce a bunch
> of indirect calls all over the place and hurt performance.

Which indirect calls? In case of unset dma_ops the DMA-API functions
call directly into the dma-direct implementation, no indirect calls at
all.

Regards,

	Joerg