linux-kernel - Re: [PATCH v1 1/8] virtio: Force only split mode with protected guest

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Message-ID: <5a2d0d70-fa6b-f08d-f222-5c00cf5f9d44@linux.intel.com>
Date:   Wed, 2 Jun 2021 19:56:46 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jason Wang <jasowang@...hat.com>, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com,
        iommu@...ts.linux-foundation.org, x86@...nel.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, jpoimboe@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/8] virtio: Force only split mode with protected guest


>
> I agree, but I want to know why indirect descriptor needs to be 
> disabled. The table can't be wrote by the device since it's not 
> coherent swiotlb mapping.

I had all kinds of problems with uninitialized entries in the indirect 
table. So I gave up on it and concluded it would be too difficult to secure.


-Andi