Re: [PATCH RFC 0/2] dma-pool: allow user to disable atomic pool

On 06/24/21 at 11:47am, Robin Murphy wrote: > On 2021-06-24 10:29, Baoquan He wrote: > > On 06/24/21 at 08:40am, Christoph Hellwig wrote: > > > So reduce the amount allocated. But the pool is needed for proper > > > operation on systems with memory encryption. And please add the right > > > maint

Re: [PATCH v2 3/4] dma-iommu: pass SKIP_CPU_SYNC to swiotlb unmap

On Mon, Aug 2, 2021 at 10:54 PM Will Deacon wrote: > > On Fri, Jul 09, 2021 at 12:35:01PM +0900, David Stevens wrote: > > From: David Stevens > > > > If SKIP_CPU_SYNC isn't already set, then iommu_dma_unmap_(page|sg) has > > already called iommu_dma_sync_(single|sg)_for_cpu, so there is no need >

Re: [PATCH v2 1/4] dma-iommu: fix sync_sg with swiotlb

On Mon, Aug 2, 2021 at 10:30 PM Will Deacon wrote: > > On Fri, Jul 09, 2021 at 12:34:59PM +0900, David Stevens wrote: > > From: David Stevens > > > > The is_swiotlb_buffer function takes the physical address of the swiotlb > > buffer, not the physical address of the original buffer. The sglist >

RE: [RFC v2] /dev/iommu uAPI proposal

> From: Eric Auger > Sent: Wednesday, August 4, 2021 11:59 PM > [...] > > 1.2. Attach Device to I/O address space > > +++ > > > > Device attach/bind is initiated through passthrough framework uAPI. > > > > Device attaching is allowed only after a device is succ

RE: [RFC v2] /dev/iommu uAPI proposal

> From: Jason Gunthorpe > Sent: Wednesday, August 4, 2021 10:05 PM > > On Mon, Aug 02, 2021 at 02:49:44AM +, Tian, Kevin wrote: > > > Can you elaborate? IMO the user only cares about the label (device cookie > > plus optional vPASID) which is generated by itself when doing the attaching > >

Re: [PATCH V2 03/14] x86/set_memory: Add x86_set_memory_enc static call support

On 8/4/21 11:44 AM, Tianyu Lan wrote: > +static int default_set_memory_enc(unsigned long addr, int numpages, bool > enc); > +DEFINE_STATIC_CALL(x86_set_memory_enc, default_set_memory_enc); > + > #define CPA_FLUSHTLB 1 > #define CPA_ARRAY 2 > #define CPA_PAGES_ARRAY 4 > @@ -1981,6 +1985,11 @@ in

Re: [PATCH v3 08/25] iommu/rockchip: Drop IOVA cookie management

Am Mittwoch, 4. August 2021, 19:15:36 CEST schrieb Robin Murphy: > The core code bakes its own cookies now. > > CC: Heiko Stuebner > Signed-off-by: Robin Murphy On a Rockchip rk3288 (arm32), rk3399 (arm64) and px30 (arm64) with the graphics pipeline using the iommu Tested-by: Heiko Stuebner

Re: [PATCH v3 01/25] iommu: Pull IOVA cookie management into the core

Am Mittwoch, 4. August 2021, 19:15:29 CEST schrieb Robin Murphy: > Now that everyone has converged on iommu-dma for IOMMU_DOMAIN_DMA > support, we can abandon the notion of drivers being responsible for the > cookie type, and consolidate all the management into the core code. > > CC: Marek Szyprow

[PATCH V2 14/14] HV/Storvsc: Add Isolation VM support for storvsc driver

From: Tianyu Lan In Isolation VM, all shared memory with host needs to mark visible to host via hvcall. vmbus_establish_gpadl() has already done it for storvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_ mpb_desc() still need to handle. Use DMA API to map/umap these memory during

[PATCH V2 13/14] HV/Netvsc: Add Isolation VM support for netvsc driver

From: Tianyu Lan In Isolation VM, all shared memory with host needs to mark visible to host via hvcall. vmbus_establish_gpadl() has already done it for netvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_ pagebuffer() still need to handle. Use DMA API to map/umap these memory durin

[PATCH V2 12/14] HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM

From: Tianyu Lan Hyper-V Isolation VM requires bounce buffer support to copy data from/to encrypted memory and so enable swiotlb force mode to use swiotlb bounce buffer for DMA transaction. In Isolation VM with AMD SEV, the bounce buffer needs to be accessed via extra address space which is abov

[PATCH V2 11/14] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM

From: Tianyu Lan In Isolation VM with AMD SEV, bounce buffer needs to be accessed via extra address space which is above shared_gpa_boundary (E.G 39 bit address line) reported by Hyper-V CPUID ISOLATION_CONFIG. The access physical address will be original physical address + shared_gpa_boundary. T

[PATCH V2 10/14] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function

From: Tianyu Lan In Hyper-V Isolation VM with AMD SEV, swiotlb boucne buffer needs to be mapped into address space above vTOM and so introduce dma_map_decrypted/dma_unmap_encrypted() to map/unmap bounce buffer memory. The platform can populate man/unmap callback in the dma memory decrypted ops.

[PATCH V2 09/14] HV/Vmbus: Initialize VMbus ring buffer for Isolation VM

From: Tianyu Lan VMbus ring buffer are shared with host and it's need to be accessed via extra address space of Isolation VM with SNP support. This patch is to map the ring buffer address in extra address space via ioremap(). HV host visibility hvcall smears data in the ring buffer and so reset t

[PATCH V2 08/14] HV/Vmbus: Add SNP support for VMbus channel initiate message

From: Tianyu Lan The monitor pages in the CHANNELMSG_INITIATE_CONTACT msg are shared with host in Isolation VM and so it's necessary to use hvcall to set them visible to host. In Isolation VM with AMD SEV SNP, the access address should be in the extra space which is above shared gpa boundary. So

[PATCH V2 07/14] HV: Add ghcb hvcall support for SNP VM

From: Tianyu Lan Hyper-V provides ghcb hvcall to handle VMBus HVCALL_SIGNAL_EVENT and HVCALL_POST_MESSAGE msg in SNP Isolation VM. Add such support. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/ivm.c | 43 + arch/x86/include/asm/mshyperv.h | 1 + dri

[PATCH V2 06/14] HV: Add Write/Read MSR registers via ghcb page

From: Tianyu Lan Hyper-V provides GHCB protocol to write Synthetic Interrupt Controller MSR registers in Isolation VM with AMD SEV SNP and these registers are emulated by hypervisor directly. Hyper-V requires to write SINTx MSR registers twice. First writes MSR via GHCB page to communicate with h

[PATCH V2 05/14] HV: Mark vmbus ring buffer visible to host in Isolation VM

From: Tianyu Lan Mark vmbus ring buffer visible with set_memory_decrypted() when establish gpadl handle. Signed-off-by: Tianyu Lan --- drivers/hv/channel.c | 44 -- include/linux/hyperv.h | 11 +++ 2 files changed, 53 insertions(+), 2 deletions

[PATCH V2 04/14] x86/HV: Add new hvcall guest address host visibility support

From: Tianyu Lan Add new hvcall guest address host visibility support to mark memory visible to host. Override x86_set_memory_enc static call with hv hook to mark memory visible to host via set_ memory_decrypted(). Signed-off-by: Tianyu Lan --- Change since v1: * Use new staic call x86_s

[PATCH V2 03/14] x86/set_memory: Add x86_set_memory_enc static call support

From: Tianyu Lan Hyper-V and other platforms(e.g Intel and AMD) want to override the __set_memory_enc_dec(). Add x86_set_memory_enc static call here and platforms can hook their implementation. Signed-off-by: Tianyu Lan --- arch/x86/include/asm/set_memory.h | 4 arch/x86/mm/pat/set_memory

[PATCH V2 02/14] x86/HV: Initialize shared memory boundary in the Isolation VM.

From: Tianyu Lan Hyper-V exposes shared memory boundary via cpuid HYPERV_CPUID_ISOLATION_CONFIG and store it in the shared_gpa_boundary of ms_hyperv struct. This prepares to share memory with host for SNP guest. Signed-off-by: Tianyu Lan --- arch/x86/kernel/cpu/mshyperv.c | 2 ++ include/asm-

[PATCH V2 01/14] x86/HV: Initialize GHCB page in Isolation VM

From: Tianyu Lan Hyper-V exposes GHCB page via SEV ES GHCB MSR for SNP guest to communicate with hypervisor. Map GHCB page for all cpus to read/write MSR register and submit hvcall request via GHCB. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/hv_init.c | 69

[PATCH V2 00/14] x86/Hyper-V: Add Hyper-V Isolation VM support

From: Tianyu Lan Hyper-V provides two kinds of Isolation VMs. VBS(Virtualization-based security) and AMD SEV-SNP unenlightened Isolation VMs. This patchset is to add support for these Isolation VM support in Linux. The memory of these vms are encrypted and host can't access guest memory directly

[PATCH v3 25/25] iommu: Allow enabling non-strict mode dynamically

Allocating and enabling a flush queue is in fact something we can reasonably do while a DMA domain is active, without having to rebuild it from scratch. Thus we can allow a strict -> non-strict transition from sysfs without requiring to unbind the device's driver, which is of particular interest to

[PATCH v3 24/25] iommu/dma: Factor out flush queue init

Factor out flush queue setup from the initial domain init so that we can potentially trigger it from sysfs later on in a domain's lifetime. Reviewed-by: Lu Baolu Reviewed-by: John Garry Signed-off-by: Robin Murphy --- drivers/iommu/dma-iommu.c | 30 -- include/linux

[PATCH v3 23/25] iommu: Merge strictness and domain type configs

To parallel the sysfs behaviour, merge the new build-time option for DMA domain strictness into the default domain type choice. Suggested-by: Joerg Roedel Reviewed-by: Lu Baolu Reviewed-by: Jean-Philippe Brucker Signed-off-by: Robin Murphy --- v3: Remember to update parameter documentation a

[PATCH v3 22/25] iommu: Only log strictness for DMA domains

When passthrough is enabled, the default strictness policy becomes irrelevant, since any subsequent runtime override to a DMA domain type now embodies an explicit choice of strictness as well. Save on noise by only logging the default policy when it is meaningfully in effect. Reviewed-by: John Gar

[PATCH v3 21/25] iommu: Expose DMA domain strictness via sysfs

The sysfs interface for default domain types exists primarily so users can choose the performance/security tradeoff relevant to their own workload. As such, the choice between the policies for DMA domains fits perfectly as an additional point on that scale - downgrading a particular device from a s

[PATCH v3 20/25] iommu: Express DMA strictness via the domain type

Eliminate the iommu_get_dma_strict() indirection and pipe the information through the domain type from the beginning. Besides the flow simplification this also has several nice side-effects: - Automatically implies strict mode for untrusted devices by virtue of their IOMMU_DOMAIN_DMA override.

[PATCH v3 19/25] iommu/vt-d: Prepare for multiple DMA domain types

In preparation for the strict vs. non-strict decision for DMA domains to be expressed in the domain type, make sure we expose our flush queue awareness by accepting the new domain type, and test the specific feature flag where we want to identify DMA domains in general. The DMA ops reset/setup can

[PATCH v3 18/25] iommu/arm-smmu: Prepare for multiple DMA domain types

In preparation for the strict vs. non-strict decision for DMA domains to be expressed in the domain type, make sure we expose our flush queue awareness by accepting the new domain type. Signed-off-by: Robin Murphy --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 1 + drivers/iommu/arm/arm-smmu/

[PATCH v3 17/25] iommu/amd: Prepare for multiple DMA domain types

The DMA ops reset/setup can simply be unconditional, since iommu-dma already knows only to touch DMA domains. Signed-off-by: Robin Murphy --- drivers/iommu/amd/iommu.c | 9 ++--- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu

[PATCH v3 16/25] iommu: Introduce explicit type for non-strict DMA domains

Promote the difference between strict and non-strict DMA domains from an internal detail to a distinct domain feature and type, to pave the road for exposing it through the sysfs default domain interface. Reviewed-by: Lu Baolu Reviewed-by: Jean-Philippe Brucker Signed-off-by: Robin Murphy ---

[PATCH v3 15/25] iommu/io-pgtable: Remove non-strict quirk

IO_PGTABLE_QUIRK_NON_STRICT was never a very comfortable fit, since it's not a quirk of the pagetable format itself. Now that we have a more appropriate way to convey non-strict unmaps, though, this last of the non-quirk quirks can also go, and with the flush queue code also now enforcing its own o

[PATCH v3 14/25] iommu: Indicate queued flushes via gather data

Since iommu_iotlb_gather exists to help drivers optimise flushing for a given unmap request, it is also the logical place to indicate whether the unmap is strict or not, and thus help them further optimise for whether to expect a sync or a flush_all subsequently. As part of that, it also seems fair

[PATCH v3 13/25] iommu/dma: Remove redundant "!dev" checks

iommu_dma_init_domain() is now only called from iommu_setup_dma_ops(), which has already assumed dev to be non-NULL. Reviewed-by: John Garry Reviewed-by: Lu Baolu Signed-off-by: Robin Murphy --- drivers/iommu/dma-iommu.c | 5 + 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/d

[PATCH v3 12/25] iommu/dma: Unexport IOVA cookie management

IOVA cookies are now got and put by core code, so we no longer need to export these to modular drivers. The export for getting MSI cookies stays, since VFIO can still be a module, but it was already relying on someone else putting them, so that aspect is unaffected. Reviewed-by: Lu Baolu Reviewed

[PATCH v3 11/25] iommu/virtio: Drop IOVA cookie management

The core code bakes its own cookies now. Reviewed-by: Jean-Philippe Brucker Signed-off-by: Robin Murphy --- drivers/iommu/virtio-iommu.c | 8 1 file changed, 8 deletions(-) diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c index 6abdcab7273b..80930ce04a16 100644

[PATCH v3 10/25] iommu/sun50i: Drop IOVA cookie management

The core code bakes its own cookies now. CC: Maxime Ripard Signed-off-by: Robin Murphy --- v3: Also remove unneeded include --- drivers/iommu/sun50i-iommu.c | 13 + 1 file changed, 1 insertion(+), 12 deletions(-) diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-io

[PATCH v3 09/25] iommu/sprd: Drop IOVA cookie management

The core code bakes its own cookies now. CC: Chunyan Zhang Signed-off-by: Robin Murphy --- v3: Also remove unneeded include --- drivers/iommu/sprd-iommu.c | 7 --- 1 file changed, 7 deletions(-) diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c index 73dfd9946312..27ac

[PATCH v3 08/25] iommu/rockchip: Drop IOVA cookie management

The core code bakes its own cookies now. CC: Heiko Stuebner Signed-off-by: Robin Murphy --- v3: Also remove unneeded include --- drivers/iommu/rockchip-iommu.c | 12 +--- 1 file changed, 1 insertion(+), 11 deletions(-) diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockc

[PATCH v3 07/25] iommu/mtk: Drop IOVA cookie management

The core code bakes its own cookies now. CC: Yong Wu Signed-off-by: Robin Murphy --- v3: Also remove unneeded includes --- drivers/iommu/mtk_iommu.c| 7 --- drivers/iommu/mtk_iommu_v1.c | 1 - 2 files changed, 8 deletions(-) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_

[PATCH v3 06/25] iommu/ipmmu-vmsa: Drop IOVA cookie management

The core code bakes its own cookies now. CC: Yoshihiro Shimoda CC: Geert Uytterhoeven Signed-off-by: Robin Murphy --- v3: Also remove unneeded include --- drivers/iommu/ipmmu-vmsa.c | 28 1 file changed, 4 insertions(+), 24 deletions(-) diff --git a/drivers/iomm

[PATCH v3 05/25] iommu/exynos: Drop IOVA cookie management

The core code bakes its own cookies now. CC: Marek Szyprowski Signed-off-by: Robin Murphy --- v3: Also remove unneeded include --- drivers/iommu/exynos-iommu.c | 19 --- 1 file changed, 4 insertions(+), 15 deletions(-) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu

[PATCH v3 04/25] iommu/vt-d: Drop IOVA cookie management

The core code bakes its own cookies now. Reviewed-by: Lu Baolu Signed-off-by: Robin Murphy --- drivers/iommu/intel/iommu.c | 8 1 file changed, 8 deletions(-) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index c12cc955389a..7e168634c433 100644 --- a/drivers/i

[PATCH v3 03/25] iommu/arm-smmu: Drop IOVA cookie management

The core code bakes its own cookies now. Signed-off-by: Robin Murphy --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 7 --- drivers/iommu/arm/arm-smmu/arm-smmu.c | 15 --- drivers/iommu/arm/arm-smmu/qcom_iommu.c | 9 - 3 files changed, 4 insertions(+), 27 de

[PATCH v3 01/25] iommu: Pull IOVA cookie management into the core

Now that everyone has converged on iommu-dma for IOMMU_DOMAIN_DMA support, we can abandon the notion of drivers being responsible for the cookie type, and consolidate all the management into the core code. CC: Marek Szyprowski CC: Yoshihiro Shimoda CC: Geert Uytterhoeven CC: Yong Wu CC: Heiko

[PATCH v3 02/25] iommu/amd: Drop IOVA cookie management

The core code bakes its own cookies now. Signed-off-by: Robin Murphy --- v3: Also remove unneeded include --- drivers/iommu/amd/iommu.c | 13 - 1 file changed, 13 deletions(-) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 52fe2326042a..92f7cbe3d14a 10064

[PATCH v3 00/25] iommu: Refactor DMA domain strictness

v1: https://lore.kernel.org/linux-iommu/cover.1626888444.git.robin.mur...@arm.com/ v2: https://lore.kernel.org/linux-iommu/cover.1627468308.git.robin.mur...@arm.com/ Hi all, Round 3, and the patch count has crept up yet again. But the overall diffstat is even more negative, so that's good, righ

Re: [RFC v2] /dev/iommu uAPI proposal

Hi Kevin, Few comments/questions below. On 7/9/21 9:48 AM, Tian, Kevin wrote: > /dev/iommu provides an unified interface for managing I/O page tables for > devices assigned to userspace. Device passthrough frameworks (VFIO, vDPA, > etc.) are expected to use this interface instead of creating th

Re: [PATCH v10 01/17] iova: Export alloc_iova_fast() and free_iova_fast()

On 2021-08-04 06:02, Yongji Xie wrote: On Tue, Aug 3, 2021 at 6:54 PM Robin Murphy wrote: On 2021-08-03 09:54, Yongji Xie wrote: On Tue, Aug 3, 2021 at 3:41 PM Jason Wang wrote: 在 2021/7/29 下午3:34, Xie Yongji 写道: Export alloc_iova_fast() and free_iova_fast() so that some modules can use

Re: [RFC v2] /dev/iommu uAPI proposal

On Tue, Aug 03, 2021 at 11:58:54AM +1000, David Gibson wrote: > > I'd rather deduce the endpoint from a collection of devices than the > > other way around... > > Which I think is confusing, and in any case doesn't cover the case of > one "device" with multiple endpoints. Well they are both confu

Re: [RFC v2] /dev/iommu uAPI proposal

On Mon, Aug 02, 2021 at 02:49:44AM +, Tian, Kevin wrote: > Can you elaborate? IMO the user only cares about the label (device cookie > plus optional vPASID) which is generated by itself when doing the attaching > call, and expects this virtual label being used in various spots > (invalidatio

Re: [PATCH v10 10/17] virtio: Handle device reset failure in register_virtio_device()

On Wed, Aug 4, 2021 at 4:54 PM Jason Wang wrote: > > > 在 2021/8/4 下午4:50, Yongji Xie 写道: > > On Wed, Aug 4, 2021 at 4:32 PM Jason Wang wrote: > >> > >> 在 2021/8/3 下午5:38, Yongji Xie 写道: > >>> On Tue, Aug 3, 2021 at 4:09 PM Jason Wang wrote: > 在 2021/7/29 下午3:34, Xie Yongji 写道: > > The d

Re: [PATCH v10 10/17] virtio: Handle device reset failure in register_virtio_device()

在 2021/8/4 下午4:50, Yongji Xie 写道: On Wed, Aug 4, 2021 at 4:32 PM Jason Wang wrote: 在 2021/8/3 下午5:38, Yongji Xie 写道: On Tue, Aug 3, 2021 at 4:09 PM Jason Wang wrote: 在 2021/7/29 下午3:34, Xie Yongji 写道: The device reset may fail in virtio-vdpa case now, so add checks to its return value and

Re: [PATCH v10 10/17] virtio: Handle device reset failure in register_virtio_device()

On Wed, Aug 4, 2021 at 4:32 PM Jason Wang wrote: > > > 在 2021/8/3 下午5:38, Yongji Xie 写道: > > On Tue, Aug 3, 2021 at 4:09 PM Jason Wang wrote: > >> > >> 在 2021/7/29 下午3:34, Xie Yongji 写道: > >>> The device reset may fail in virtio-vdpa case now, so add checks to > >>> its return value and fail the

Re: [PATCH v10 05/17] vhost-vdpa: Fail the vhost_vdpa_set_status() on reset failure

在 2021/8/3 下午5:50, Yongji Xie 写道: On Tue, Aug 3, 2021 at 4:10 PM Jason Wang wrote: 在 2021/7/29 下午3:34, Xie Yongji 写道: Re-read the device status to ensure it's set to zero during resetting. Otherwise, fail the vhost_vdpa_set_status() after timeout. Signed-off-by: Xie Yongji --- drivers/v

Re: [PATCH v10 10/17] virtio: Handle device reset failure in register_virtio_device()

在 2021/8/3 下午5:38, Yongji Xie 写道: On Tue, Aug 3, 2021 at 4:09 PM Jason Wang wrote: 在 2021/7/29 下午3:34, Xie Yongji 写道: The device reset may fail in virtio-vdpa case now, so add checks to its return value and fail the register_virtio_device(). So the reset() would be called by the driver dur

Re: [PATCH v10 04/17] vdpa: Fail the vdpa_reset() if fail to set device status to zero

在 2021/8/3 下午5:31, Yongji Xie 写道: On Tue, Aug 3, 2021 at 3:58 PM Jason Wang wrote: 在 2021/7/29 下午3:34, Xie Yongji 写道: Re-read the device status to ensure it's set to zero during resetting. Otherwise, fail the vdpa_reset() after timeout. Signed-off-by: Xie Yongji --- include/linux/vdpa.h

Re: [PATCH v10 02/17] file: Export receive_fd() to modules

在 2021/8/3 下午5:01, Yongji Xie 写道: On Tue, Aug 3, 2021 at 3:46 PM Jason Wang wrote: 在 2021/7/29 下午3:34, Xie Yongji 写道: Export receive_fd() so that some modules can use it to pass file descriptor between processes without missing any security stuffs. Signed-off-by: Xie Yongji --- fs/file.

Re: [RFC v1 6/8] mshv: command line option to skip devices in PV-IOMMU

On 04-08-2021 03:26, Wei Liu wrote: >>> struct iommu_domain domain; >>> @@ -774,6 +784,41 @@ static struct iommu_device >>> *hv_iommu_probe_device(struct device *dev) >>> if (!dev_is_pci(dev)) >>> return ERR_PTR(-ENODEV); >>> >>> + /* >>> +* Skip the PCI device specifie