linux-kernel - Re: [PATCH 1/2] xen/arm64: do not set SWIOTLB_NO

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Date:   Wed, 12 May 2021 12:55:40 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Christoph Hellwig <hch@....de>
cc:     Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        Stefano Stabellini <stefano.stabellini@...inx.com>,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] xen/arm64: do not set SWIOTLB_NO_FORCE when swiotlb
 is required

On Wed, 12 May 2021, Christoph Hellwig wrote:
> > -int xen_swiotlb_detect(void)
> > -{
> > -	if (!xen_domain())
> > -		return 0;
> > -	if (xen_feature(XENFEAT_direct_mapped))
> > -		return 1;
> > -	/* legacy case */
> > -	if (!xen_feature(XENFEAT_not_direct_mapped) && xen_initial_domain())
> > -		return 1;
> > -	return 0;
> > -}
> 
> I think this move should be a separate prep patch.

Sure, I can do that