From: Andy Lutomirski <luto@kernel.org>
To: Andi Kleen <ak@linux.intel.com>, mst@redhat.com
Cc: sathyanarayanan.kuppuswamy@linux.intel.com, x86@kernel.org,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
iommu@lists.linux-foundation.org, jpoimboe@redhat.com,
robin.murphy@arm.com, hch@lst.de, m.szyprowski@samsung.com
Subject: Re: [PATCH v1 1/8] virtio: Force only split mode with protected guest
Date: Thu, 3 Jun 2021 10:33:39 -0700 [thread overview]
Message-ID: <cc5c8265-83f7-aeb1-bc30-3367fe68bc97@kernel.org> (raw)
In-Reply-To: <20210603004133.4079390-2-ak@linux.intel.com>
On 6/2/21 5:41 PM, Andi Kleen wrote:
> Only allow split mode when in a protected guest. Followon
> patches harden the split mode code paths, and we don't want
> an malicious host to force anything else. Also disallow
> indirect mode for similar reasons.
I read this as "the virtio driver is buggy. Let's disable most of the
buggy code in one special case in which we need a driver without bugs.
In all the other cases (e.g. hardware virtio device connected over
USB-C), driver bugs are still allowed."
Can we just fix the driver without special cases?
--Andy
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next prev parent reply other threads:[~2021-06-03 17:33 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-03 0:41 Virtio hardening for TDX Andi Kleen
2021-06-03 0:41 ` [PATCH v1 1/8] virtio: Force only split mode with protected guest Andi Kleen
2021-06-03 1:36 ` Jason Wang
2021-06-03 1:48 ` Andi Kleen
2021-06-03 2:32 ` Jason Wang
2021-06-03 2:56 ` Andi Kleen
2021-06-03 3:02 ` Jason Wang
2021-06-03 13:55 ` Andi Kleen
2021-06-04 2:29 ` Jason Wang
2021-06-03 17:33 ` Andy Lutomirski [this message]
2021-06-03 18:00 ` Andi Kleen
2021-06-03 19:31 ` Andy Lutomirski
2021-06-03 19:53 ` Andi Kleen
2021-06-03 22:17 ` Andy Lutomirski
2021-06-03 23:32 ` Andi Kleen
2021-06-04 1:46 ` Andy Lutomirski
2021-06-04 1:54 ` Andi Kleen
2021-06-04 1:22 ` Jason Wang
2021-06-04 1:29 ` Jason Wang
2021-06-04 2:20 ` Jason Wang
2021-06-03 0:41 ` [PATCH v1 2/8] virtio: Add boundary checks to virtio ring Andi Kleen
2021-06-03 2:14 ` Jason Wang
2021-06-03 2:18 ` Andi Kleen
2021-06-03 2:36 ` Jason Wang
2021-06-03 0:41 ` [PATCH v1 3/8] virtio: Harden split buffer detachment Andi Kleen
2021-06-03 2:29 ` Jason Wang
2021-06-03 0:41 ` [PATCH v1 4/8] x86/tdx: Add arch_has_restricted_memory_access for TDX Andi Kleen
2021-06-03 0:41 ` [PATCH v1 5/8] dma: Use size for swiotlb boundary checks Andi Kleen
2021-06-03 1:48 ` Konrad Rzeszutek Wilk
2021-06-03 2:03 ` Andi Kleen
2021-06-03 9:09 ` Robin Murphy
2021-06-03 0:41 ` [PATCH v1 6/8] dma: Add return value to dma_unmap_page Andi Kleen
2021-06-03 9:08 ` Robin Murphy
2021-06-03 12:36 ` Andi Kleen
2021-06-03 0:41 ` [PATCH v1 7/8] virtio: Abort IO when descriptor points outside forced swiotlb Andi Kleen
2021-06-03 0:41 ` [PATCH v1 8/8] virtio: Error out on endless free lists Andi Kleen
2021-06-03 1:34 ` Virtio hardening for TDX Jason Wang
2021-06-03 1:56 ` Andi Kleen
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