From: Jason Gunthorpe <jgg@nvidia.com>
To: Yi Liu <yi.l.liu@intel.com>
Cc: Nicolin Chen <nicolinc@nvidia.com>,
"Duan, Zhenzhong" <zhenzhong.duan@intel.com>,
Peter Xu <peterx@redhat.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"clg@redhat.com" <clg@redhat.com>,
"eric.auger@redhat.com" <eric.auger@redhat.com>,
"mst@redhat.com" <mst@redhat.com>,
"jasowang@redhat.com" <jasowang@redhat.com>,
"ddutile@redhat.com" <ddutile@redhat.com>,
"shameerali.kolothum.thodi@huawei.com"
<shameerali.kolothum.thodi@huawei.com>,
"joao.m.martins@oracle.com" <joao.m.martins@oracle.com>,
"clement.mathieu--drif@eviden.com"
<clement.mathieu--drif@eviden.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
"Peng, Chao P" <chao.p.peng@intel.com>,
Yi Sun <yi.y.sun@linux.intel.com>,
Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
Eduardo Habkost <eduardo@habkost.net>
Subject: Re: [PATCH rfcv3 15/21] intel_iommu: Bind/unbind guest page table to host
Date: Wed, 18 Jun 2025 08:43:39 -0300 [thread overview]
Message-ID: <20250618114339.GF1575786@nvidia.com> (raw)
In-Reply-To: <6a9f95b4-3e56-4ed3-b2a2-c41a6f728eb2@intel.com>
On Wed, Jun 18, 2025 at 11:40:38AM +0800, Yi Liu wrote:
> Actually, as I explained in the first hunk of [1], there is no issue with
> the legacy mode support. :)
>
> [1] https://lore.kernel.org/qemu-devel/20250521111452.3316354-1-zhenzhong.duan@intel.com/T/#m4c8fa70742001d4c22b3c297e240a2151d2c617f
My feeling is that it is undesirable to have the shadowing code in the
VMM at all, as it increases the attack surface/complexity/etc.
There should be a way to fully inhibit legacy mode, and if that means
old kernels don't work that's just how it is.
Jason
next prev parent reply other threads:[~2025-06-18 11:44 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-21 11:14 [PATCH rfcv3 00/21] intel_iommu: Enable stage-1 translation for passthrough device Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 01/21] backends/iommufd: Add a helper to invalidate user-managed HWPT Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 02/21] vfio/iommufd: Add properties and handlers to TYPE_HOST_IOMMU_DEVICE_IOMMUFD Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 03/21] vfio/iommufd: Initialize iommufd specific members in HostIOMMUDeviceIOMMUFD Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 04/21] vfio/iommufd: Implement [at|de]tach_hwpt handlers Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 05/21] vfio/iommufd: Save vendor specific device info Zhenzhong Duan
2025-05-21 21:57 ` Nicolin Chen
2025-05-22 9:21 ` Duan, Zhenzhong
2025-05-22 19:35 ` Nicolin Chen
2025-05-26 12:15 ` Cédric Le Goater
2025-05-27 2:12 ` Duan, Zhenzhong
2025-05-21 11:14 ` [PATCH rfcv3 06/21] iommufd: Implement query of host VTD IOMMU's capability Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 07/21] intel_iommu: Rename vtd_ce_get_rid2pasid_entry to vtd_ce_get_pasid_entry Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 08/21] intel_iommu: Optimize context entry cache utilization Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 09/21] intel_iommu: Check for compatibility with IOMMUFD backed device when x-flts=on Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 10/21] intel_iommu: Introduce a new structure VTDHostIOMMUDevice Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 11/21] intel_iommu: Introduce two helpers vtd_as_from/to_iommu_pasid_locked Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 12/21] intel_iommu: Handle PASID entry removing and updating Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 13/21] intel_iommu: Handle PASID entry adding Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 14/21] intel_iommu: Introduce a new pasid cache invalidation type FORCE_RESET Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 15/21] intel_iommu: Bind/unbind guest page table to host Zhenzhong Duan
2025-05-21 22:49 ` Nicolin Chen
2025-05-22 6:50 ` Duan, Zhenzhong
2025-05-22 19:29 ` Nicolin Chen
2025-05-23 6:26 ` Yi Liu
2025-05-26 3:34 ` Duan, Zhenzhong
2025-05-23 6:22 ` Yi Liu
2025-05-23 6:52 ` Duan, Zhenzhong
2025-05-23 21:12 ` Nicolin Chen
2025-05-26 3:46 ` Duan, Zhenzhong
2025-05-26 7:24 ` Yi Liu
2025-05-26 17:35 ` Nicolin Chen
2025-05-28 7:12 ` Duan, Zhenzhong
2025-06-12 12:53 ` Yi Liu
2025-06-12 14:06 ` Shameerali Kolothum Thodi via
2025-06-16 6:04 ` Nicolin Chen
2025-06-16 3:24 ` Duan, Zhenzhong
2025-06-16 6:34 ` Nicolin Chen
2025-06-16 8:54 ` Duan, Zhenzhong
2025-06-16 9:36 ` Yi Liu
2025-06-16 10:16 ` Duan, Zhenzhong
2025-06-17 7:04 ` Yi Liu
2025-06-16 5:59 ` Nicolin Chen
2025-06-16 7:38 ` Yi Liu
2025-06-17 3:22 ` Nicolin Chen
2025-06-17 6:48 ` Yi Liu
2025-06-16 5:47 ` Nicolin Chen
2025-06-16 8:15 ` Duan, Zhenzhong
2025-06-17 3:14 ` Nicolin Chen
2025-06-17 12:37 ` Jason Gunthorpe
2025-06-17 13:03 ` Yi Liu
2025-06-17 13:11 ` Jason Gunthorpe
2025-06-18 2:51 ` Duan, Zhenzhong
2025-06-18 3:40 ` Yi Liu
2025-06-18 11:43 ` Jason Gunthorpe [this message]
2025-05-21 11:14 ` [PATCH rfcv3 16/21] intel_iommu: ERRATA_772415 workaround Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 17/21] intel_iommu: Replay pasid binds after context cache invalidation Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 18/21] intel_iommu: Propagate PASID-based iotlb invalidation to host Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 19/21] intel_iommu: Refresh pasid bind when either SRTP or TE bit is changed Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 20/21] intel_iommu: Bypass replay in stage-1 page table mode Zhenzhong Duan
2025-05-21 11:14 ` [PATCH rfcv3 21/21] intel_iommu: Enable host device when x-flts=on in scalable mode Zhenzhong Duan
2025-05-26 12:19 ` [PATCH rfcv3 00/21] intel_iommu: Enable stage-1 translation for passthrough device Cédric Le Goater
2025-05-27 2:16 ` Duan, Zhenzhong
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