From: Jason Gunthorpe <jgg@nvidia.com>
To: Zhangfei Gao <zhangfei.gao@linaro.org>
Cc: acpica-devel@lists.linux.dev, Hanjun Guo <guohanjun@huawei.com>,
iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
Kevin Tian <kevin.tian@intel.com>,
kvm@vger.kernel.org, Len Brown <lenb@kernel.org>,
linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
Lorenzo Pieralisi <lpieralisi@kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Robert Moore <robert.moore@intel.com>,
Robin Murphy <robin.murphy@arm.com>,
Sudeep Holla <sudeep.holla@arm.com>,
Will Deacon <will@kernel.org>,
Alex Williamson <alex.williamson@redhat.com>,
Eric Auger <eric.auger@redhat.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Moritz Fischer <mdf@kernel.org>,
Michael Shavit <mshavit@google.com>,
Nicolin Chen <nicolinc@nvidia.com>,
patches@lists.linux.dev,
Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
Mostafa Saleh <smostafa@google.com>
Subject: Re: [PATCH v2 0/8] Initial support for SMMUv3 nested translation
Date: Wed, 16 Oct 2024 08:53:31 -0300 [thread overview]
Message-ID: <20241016115331.GB3559746@nvidia.com> (raw)
In-Reply-To: <CABQgh9E32c5inrn=Q5HWThuJQ4xV=EFWLGwbyxVLHQVUZ_uYCA@mail.gmail.com>
On Wed, Oct 16, 2024 at 10:23:49AM +0800, Zhangfei Gao wrote:
> > Nesting support requires the system to either support S2FWB or the
> > stronger CANWBS ACPI flag. This is to ensure the VM cannot bypass the
> > cache and view incoherent data, currently VFIO lacks any cache flushing
> > that would make this safe.
>
> What if the system does not support S2FWB or CANWBS, any workaround to
> passthrough?
Eventually we can add the required cache flushing to VFIO, but that
would have to be a followup.
> Currently I am testing nesting by ignoring this check.
This is probably OK, but I wouldn't run it as a production environment
with a hostile VM.
Jason
prev parent reply other threads:[~2024-10-16 11:53 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-27 15:51 [PATCH v2 0/8] Initial support for SMMUv3 nested translation Jason Gunthorpe
2024-08-27 15:51 ` [PATCH v2 1/8] vfio: Remove VFIO_TYPE1_NESTING_IOMMU Jason Gunthorpe
2024-08-30 7:40 ` Tian, Kevin
2024-08-27 15:51 ` [PATCH v2 2/8] iommu/arm-smmu-v3: Use S2FWB when available Jason Gunthorpe
2024-08-27 19:48 ` Nicolin Chen
2024-08-28 18:30 ` Jason Gunthorpe
2024-08-28 19:47 ` Nicolin Chen
2024-08-28 19:50 ` Nicolin Chen
2024-08-30 7:44 ` Tian, Kevin
2024-08-30 7:56 ` Nicolin Chen
2024-08-30 8:01 ` Tian, Kevin
2024-08-30 15:12 ` Mostafa Saleh
2024-08-30 16:40 ` Jason Gunthorpe
2024-09-02 9:29 ` Mostafa Saleh
2024-09-03 0:05 ` Jason Gunthorpe
2024-09-03 7:57 ` Mostafa Saleh
2024-09-03 23:33 ` Jason Gunthorpe
2024-09-10 10:55 ` Mostafa Saleh
2024-09-10 20:22 ` Jason Gunthorpe
2024-09-17 9:48 ` Mostafa Saleh
2024-09-04 14:20 ` Shameerali Kolothum Thodi
2024-09-04 15:00 ` Jason Gunthorpe
2024-09-10 11:25 ` Shameerali Kolothum Thodi
2024-09-11 22:52 ` Jason Gunthorpe
2024-08-27 15:51 ` [PATCH v2 3/8] ACPICA: IORT: Update for revision E.f Jason Gunthorpe
2024-08-29 10:14 ` Rafael J. Wysocki
2024-08-27 15:51 ` [PATCH v2 4/8] ACPI/IORT: Support CANWBS memory access flag Jason Gunthorpe
2024-08-30 7:52 ` Tian, Kevin
2024-08-30 13:54 ` Jason Gunthorpe
2024-09-03 7:14 ` Tian, Kevin
2024-08-27 15:51 ` [PATCH v2 5/8] iommu/arm-smmu-v3: Report IOMMU_CAP_ENFORCE_CACHE_COHERENCY for CANWBS Jason Gunthorpe
2024-08-27 20:12 ` Nicolin Chen
2024-08-28 19:12 ` Jason Gunthorpe
2024-08-30 15:19 ` Mostafa Saleh
2024-08-30 17:10 ` Jason Gunthorpe
2024-08-27 15:51 ` [PATCH v2 6/8] iommu/arm-smmu-v3: Support IOMMU_GET_HW_INFO via struct arm_smmu_hw_info Jason Gunthorpe
2024-08-30 7:55 ` Tian, Kevin
2024-08-30 15:23 ` Mostafa Saleh
2024-08-30 17:16 ` Jason Gunthorpe
2024-09-02 10:11 ` Mostafa Saleh
2024-09-03 0:16 ` Jason Gunthorpe
2024-09-03 8:34 ` Mostafa Saleh
2024-09-03 23:40 ` Jason Gunthorpe
2024-09-04 7:11 ` Shameerali Kolothum Thodi
2024-09-04 12:01 ` Jason Gunthorpe
2024-09-06 11:19 ` Mostafa Saleh
2024-08-27 15:51 ` [PATCH v2 7/8] iommu/arm-smmu-v3: Implement IOMMU_HWPT_ALLOC_NEST_PARENT Jason Gunthorpe
2024-08-27 20:16 ` Nicolin Chen
2024-08-30 7:58 ` Tian, Kevin
2024-08-30 13:55 ` Jason Gunthorpe
2024-08-30 15:27 ` Mostafa Saleh
2024-08-30 17:18 ` Jason Gunthorpe
2024-09-02 8:57 ` Mostafa Saleh
2024-08-27 15:51 ` [PATCH v2 8/8] iommu/arm-smmu-v3: Support IOMMU_DOMAIN_NESTED Jason Gunthorpe
2024-08-27 21:23 ` Nicolin Chen
2024-08-28 19:01 ` Jason Gunthorpe
2024-08-28 19:27 ` Nicolin Chen
2024-08-30 8:16 ` Tian, Kevin
2024-08-30 14:13 ` Jason Gunthorpe
2024-08-30 14:39 ` Jason Gunthorpe
2024-08-30 16:09 ` Mostafa Saleh
2024-08-30 16:59 ` Nicolin Chen
2024-08-30 17:04 ` Jason Gunthorpe
2024-09-02 9:57 ` Mostafa Saleh
2024-09-03 0:30 ` Jason Gunthorpe
2024-09-03 1:13 ` Nicolin Chen
2024-09-03 9:00 ` Mostafa Saleh
2024-09-03 23:55 ` Jason Gunthorpe
2024-09-06 11:07 ` Mostafa Saleh
2024-09-06 13:34 ` Jason Gunthorpe
2024-09-10 11:12 ` Mostafa Saleh
2024-09-15 21:39 ` Jason Gunthorpe
2024-09-06 18:28 ` Jason Gunthorpe
2024-09-06 18:49 ` Nicolin Chen
2024-09-06 23:15 ` Jason Gunthorpe
2024-08-27 21:31 ` [PATCH v2 0/8] Initial support for SMMUv3 nested translation Nicolin Chen
2024-08-28 16:31 ` Shameerali Kolothum Thodi
2024-08-28 17:14 ` Nicolin Chen
2024-08-28 18:06 ` Shameerali Kolothum Thodi
2024-08-28 18:12 ` Nicolin Chen
2024-08-29 13:14 ` Shameerali Kolothum Thodi
2024-08-29 14:52 ` Shameerali Kolothum Thodi
2024-08-29 16:10 ` Nicolin Chen
2024-08-30 9:07 ` Shameerali Kolothum Thodi
2024-08-30 17:01 ` Nicolin Chen
2024-09-12 3:42 ` Zhangfei Gao
2024-09-12 4:05 ` Nicolin Chen
2024-09-12 4:25 ` Baolu Lu
2024-09-12 7:32 ` Zhangfei Gao
2024-10-15 3:21 ` Zhangfei Gao
2024-10-15 13:09 ` Jason Gunthorpe
2024-10-17 1:53 ` Zhangfei Gao
2024-10-17 11:57 ` Jason Gunthorpe
2024-10-16 2:23 ` Zhangfei Gao
2024-10-16 11:53 ` Jason Gunthorpe [this message]
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