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From: Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>
To: Jean-Philippe Brucker
	<jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
Cc: ilias.apalodimas-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
	kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	xuzaibo-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
	will.deacon-5wv7dgnIgG8@public.gmane.org,
	okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
	linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
	ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
	bharatku-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org,
	linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	rfranz-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	rgummal-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
	iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
	christian.koenig-5C7GfCeVMHo@public.gmane.org
Subject: Re: [PATCH v2 16/40] arm64: mm: Pin down ASIDs for sharing mm with devices
Date: Tue, 15 May 2018 15:16:58 +0100
Message-ID: <20180515141658.vivrgcyww2pxumye@armageddon.cambridge.arm.com> (raw)
In-Reply-To: <20180511190641.23008-17-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>

Hi Jean-Philippe,

On Fri, May 11, 2018 at 08:06:17PM +0100, Jean-Philippe Brucker wrote:
> +unsigned long mm_context_get(struct mm_struct *mm)
> +{
> +	unsigned long flags;
> +	u64 asid;
> +
> +	raw_spin_lock_irqsave(&cpu_asid_lock, flags);
> +
> +	asid = atomic64_read(&mm->context.id);
> +
> +	if (mm->context.pinned) {
> +		mm->context.pinned++;
> +		asid &= ~ASID_MASK;
> +		goto out_unlock;
> +	}
> +
> +	if (nr_pinned_asids >= max_pinned_asids) {
> +		asid = 0;
> +		goto out_unlock;
> +	}
> +
> +	if (!asid_gen_match(asid)) {
> +		/*
> +		 * We went through one or more rollover since that ASID was
> +		 * used. Ensure that it is still valid, or generate a new one.
> +		 * The cpu argument isn't used by new_context.
> +		 */
> +		asid = new_context(mm, 0);
> +		atomic64_set(&mm->context.id, asid);
> +	}
> +
> +	asid &= ~ASID_MASK;
> +
> +	nr_pinned_asids++;
> +	__set_bit(asid2idx(asid), pinned_asid_map);
> +	mm->context.pinned++;
> +
> +out_unlock:
> +	raw_spin_unlock_irqrestore(&cpu_asid_lock, flags);
> +
> +	return asid;
> +}

With CONFIG_UNMAP_KERNEL_AT_EL0 (a.k.a. KPTI), the hardware ASID has bit
0 set automatically when entering user space (and cleared when getting
back to the kernel). If the returned asid value here is going to be used
as is in the calling code, you should probably set bit 0 when KPTI is
enabled.

-- 
Catalin

  parent reply index

Thread overview: 123+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11 19:06 [PATCH v2 00/40] Shared Virtual Addressing for the IOMMU Jean-Philippe Brucker
     [not found] ` <20180511190641.23008-1-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-11 19:06   ` [PATCH v2 01/40] iommu: Introduce Shared Virtual Addressing API Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-2-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-16 20:41       ` Jacob Pan
2018-05-17 10:02         ` Jean-Philippe Brucker
2018-05-17 17:00           ` Jacob Pan
2018-09-05 11:29       ` Auger Eric
     [not found]         ` <bf42affd-e9d0-e4fc-6d28-f3c3f7795348-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-09-06 11:09           ` Jean-Philippe Brucker
     [not found]             ` <03d31ba5-1eda-ea86-8c0c-91d14c86fe83-5wv7dgnIgG8@public.gmane.org>
2018-09-06 11:12               ` Christian König
     [not found]                 ` <ed39159c-087e-7e56-7d29-d1de9fa1677f-5C7GfCeVMHo@public.gmane.org>
2018-09-06 12:45                   ` Jean-Philippe Brucker
     [not found]                     ` <f0b317d5-e2e9-5478-952c-05e8b97bd68b-5wv7dgnIgG8@public.gmane.org>
2018-09-07  8:55                       ` Christian König
     [not found]                         ` <2fd4a0a1-1a35-bf82-df84-b995cce011d9-5C7GfCeVMHo@public.gmane.org>
2018-09-07 15:45                           ` Jean-Philippe Brucker
     [not found]                             ` <65e7accd-4446-19f5-c667-c6407e89cfa6-5wv7dgnIgG8@public.gmane.org>
2018-09-07 18:02                               ` Christian König
     [not found]                                 ` <5bbc0332-b94b-75cc-ca42-a9b196811daf-5C7GfCeVMHo@public.gmane.org>
2018-09-07 21:25                                   ` Jacob Pan
2018-09-08  7:29                                     ` Christian König
     [not found]                                       ` <3e3a6797-a233-911b-3a7d-d9b549160960-5C7GfCeVMHo@public.gmane.org>
2018-09-12 12:40                                         ` Jean-Philippe Brucker
     [not found]                                           ` <9445a0be-fb5b-d195-4fdf-7ad6cb36ef4f-5wv7dgnIgG8@public.gmane.org>
2018-09-12 12:56                                             ` Christian König
2018-09-13  7:15                                     ` Tian, Kevin
2018-09-13  7:26                           ` Tian, Kevin
2018-05-11 19:06   ` [PATCH v2 02/40] iommu/sva: Bind process address spaces to devices Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-3-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-17 13:10       ` Jonathan Cameron
     [not found]         ` <20180517141058.00001c76-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-21 14:43           ` Jean-Philippe Brucker
2018-09-05 11:29       ` Auger Eric
     [not found]         ` <471873d4-a1a6-1a3a-cf17-1e686b4ade96-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-09-06 11:09           ` Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 03/40] iommu/sva: Manage process address spaces Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-4-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-16 23:31       ` Jacob Pan
2018-05-17 10:02         ` Jean-Philippe Brucker
     [not found]           ` <de478769-9f7a-d40b-a55e-e2c63ad883e8-5wv7dgnIgG8@public.gmane.org>
2018-05-22 16:43             ` Jacob Pan
2018-05-24 11:44               ` Jean-Philippe Brucker
2018-05-24 11:50                 ` Ilias Apalodimas
2018-05-24 15:04                   ` Jean-Philippe Brucker
     [not found]                     ` <19e82a74-429a-3f86-119e-32b12082d0ff-5wv7dgnIgG8@public.gmane.org>
2018-05-25  6:33                       ` Ilias Apalodimas
2018-05-25  8:39                         ` Jonathan Cameron
     [not found]                           ` <20180525093959.000040a7-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-26  2:24                             ` Kenneth Lee
2018-05-26  2:24                           ` Kenneth Lee
     [not found]                           ` <20180526022445.GA6069@kllp05>
2018-06-11 16:10                             ` Kenneth Lee
2018-06-11 16:10                             ` Kenneth Lee
2018-06-11 16:32                           ` Kenneth Lee
2018-05-17 14:25       ` Jonathan Cameron
     [not found]         ` <20180517150516.000067ca-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-21 14:44           ` Jean-Philippe Brucker
2018-09-05 12:14       ` Auger Eric
     [not found]         ` <d785ec89-6743-d0f1-1a7f-85599a033e5b-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-09-05 18:18           ` Jacob Pan
2018-09-06 17:40             ` Jean-Philippe Brucker
2018-09-06 11:10           ` Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 04/40] iommu/sva: Add a mm_exit callback for device drivers Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-5-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-09-05 13:23       ` Auger Eric
     [not found]         ` <d1dc28c4-7742-9c41-3f91-3fbcb8b13c1c-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-09-06 11:10           ` Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 05/40] iommu/sva: Track mm changes with an MMU notifier Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-6-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-17 14:25       ` Jonathan Cameron
     [not found]         ` <20180517152514.00004247-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-21 14:44           ` Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 06/40] iommu/sva: Search mm by PASID Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 07/40] iommu: Add a page fault handler Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-8-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-17 15:25       ` Jonathan Cameron
     [not found]         ` <20180517162555.00002bd3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-21 14:48           ` Jean-Philippe Brucker
2018-05-18 18:04       ` Jacob Pan
2018-05-21 14:49         ` Jean-Philippe Brucker
     [not found]           ` <8a640794-a6f3-fa01-82a9-06479a6f779a-5wv7dgnIgG8@public.gmane.org>
2018-05-22 23:35             ` Jacob Pan
2018-05-24 11:44               ` Jean-Philippe Brucker
     [not found]                 ` <bdf9f221-ab97-2168-d072-b7f6a0dba840-5wv7dgnIgG8@public.gmane.org>
2018-05-26  0:35                   ` Jacob Pan
2018-05-29 10:00                     ` Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 08/40] iommu/iopf: Handle mm faults Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 09/40] iommu/sva: Register page fault handler Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 10/40] mm: export symbol mm_access Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 11/40] mm: export symbol find_get_task_by_vpid Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 12/40] mm: export symbol mmput_async Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 13/40] vfio: Add support for Shared Virtual Addressing Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-14-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-17 15:58       ` Jonathan Cameron
     [not found]         ` <20180517165845.00000cc9-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-21 14:51           ` Jean-Philippe Brucker
2018-05-23  9:38       ` Xu Zaibo
     [not found]         ` <5B0536A3.1000304-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-24 11:44           ` Jean-Philippe Brucker
     [not found]             ` <cd13f60d-b282-3804-4ca7-2d34476c597f-5wv7dgnIgG8@public.gmane.org>
2018-05-24 12:35               ` Xu Zaibo
     [not found]                 ` <5B06B17C.1090809-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-24 15:04                   ` Jean-Philippe Brucker
     [not found]                     ` <205c1729-8026-3efe-c363-d37d7150d622-5wv7dgnIgG8@public.gmane.org>
2018-05-25  2:39                       ` Xu Zaibo
2018-05-25  9:47                         ` Jean-Philippe Brucker
     [not found]                           ` <fea420ff-e738-e2ed-ab1e-a3f4dde4b6ef-5wv7dgnIgG8@public.gmane.org>
2018-05-26  3:53                             ` Xu Zaibo
     [not found]                               ` <5B08DA21.3070507-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-29 11:55                                 ` Jean-Philippe Brucker
     [not found]                                   ` <99ff4f89-86ef-a251-894c-8aa8a47d2a69-5wv7dgnIgG8@public.gmane.org>
2018-05-29 12:24                                     ` Xu Zaibo
2018-08-27  8:06       ` Xu Zaibo
     [not found]         ` <5B83B11E.7010807-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-08-31 13:34           ` Jean-Philippe Brucker
     [not found]             ` <1d5b6529-4e5a-723c-3f1b-dd5a9adb490c-5wv7dgnIgG8@public.gmane.org>
2018-09-01  2:23               ` Xu Zaibo
     [not found]                 ` <5B89F818.7060300-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-09-03 10:34                   ` Jean-Philippe Brucker
     [not found]                     ` <3a961aff-e830-64bb-b6a9-14e08de1abf5-5wv7dgnIgG8@public.gmane.org>
2018-09-04  2:12                       ` Xu Zaibo
     [not found]                         ` <5B8DEA15.7020404-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-09-04 10:57                           ` Jean-Philippe Brucker
     [not found]                             ` <bc27f902-4d12-21b7-b9e9-18bcae170503-5wv7dgnIgG8@public.gmane.org>
2018-09-05  3:15                               ` Xu Zaibo
     [not found]                                 ` <5B8F4A59.20004-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-09-05 11:02                                   ` Jean-Philippe Brucker
     [not found]                                     ` <b51107b8-a525-13ce-f4c3-d423b8502c27-5wv7dgnIgG8@public.gmane.org>
2018-09-06  7:26                                       ` Xu Zaibo
2018-05-11 19:06   ` [PATCH v2 14/40] dt-bindings: document stall and PASID properties for IOMMU masters Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 15/40] iommu/of: Add stall and pasid properties to iommu_fwspec Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 16/40] arm64: mm: Pin down ASIDs for sharing mm with devices Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-17-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-15 14:16       ` Catalin Marinas [this message]
     [not found]         ` <20180515141658.vivrgcyww2pxumye-+1aNUgJU5qkijLcmloz0ER/iLCjYCKR+VpNB7YpNyf8@public.gmane.org>
2018-05-17 10:01           ` Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 17/40] iommu/arm-smmu-v3: Link domains and devices Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-18-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-17 16:07       ` Jonathan Cameron
     [not found]         ` <20180517170748.00004927-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-21 14:49           ` Jean-Philippe Brucker
2018-09-10 15:16       ` Auger Eric
2018-05-11 19:06   ` [PATCH v2 18/40] iommu/io-pgtable-arm: Factor out ARM LPAE register defines Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 19/40] iommu: Add generic PASID table library Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 20/40] iommu/arm-smmu-v3: Move context descriptor code Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 21/40] iommu/arm-smmu-v3: Add support for Substream IDs Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-22-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-31 11:01       ` Bharat Kumar Gogada
     [not found]         ` <BLUPR0201MB1505AA55707BE2E13392FFAFA5630-hRBPhS1iNj/g9tdZWAsUFxrHTHEw16jenBOFsp37pqbUKgpGm//BTAC/G2K4zDHf@public.gmane.org>
2018-06-01 10:46           ` Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 22/40] iommu/arm-smmu-v3: Add second level of context descriptor table Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 23/40] iommu/arm-smmu-v3: Share process page tables Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 24/40] iommu/arm-smmu-v3: Seize private ASID Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 25/40] iommu/arm-smmu-v3: Add support for VHE Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 26/40] iommu/arm-smmu-v3: Enable broadcast TLB maintenance Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 27/40] iommu/arm-smmu-v3: Add SVA feature checking Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 28/40] iommu/arm-smmu-v3: Implement mm operations Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 29/40] iommu/arm-smmu-v3: Add support for Hardware Translation Table Update Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 30/40] iommu/arm-smmu-v3: Register I/O Page Fault queue Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 31/40] iommu/arm-smmu-v3: Improve add_device error handling Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 32/40] iommu/arm-smmu-v3: Maintain a SID->device structure Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 33/40] iommu/arm-smmu-v3: Add stall support for platform devices Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 34/40] ACPI/IORT: Check ATS capability in root complex nodes Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 35/40] iommu/arm-smmu-v3: Add support for PCI ATS Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-36-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-19 17:25       ` Sinan Kaya
     [not found]         ` <922474e8-0aa5-e022-0502-f1e51b0d4859-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-05-21 14:52           ` Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 36/40] iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 37/40] iommu/arm-smmu-v3: Disable tagged pointers Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 38/40] PCI: Make "PRG Response PASID Required" handling common Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 39/40] iommu/arm-smmu-v3: Add support for PRI Jean-Philippe Brucker
     [not found]     ` <20180511190641.23008-40-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-05-25 14:08       ` Bharat Kumar Gogada
     [not found]         ` <BLUPR0201MB150513BBAA161355DE9B3A48A5690-hRBPhS1iNj/g9tdZWAsUFxrHTHEw16jenBOFsp37pqbUKgpGm//BTAC/G2K4zDHf@public.gmane.org>
2018-05-29 10:27           ` Jean-Philippe Brucker
2018-05-11 19:06   ` [PATCH v2 40/40] iommu/arm-smmu-v3: Add support for PCI PASID Jean-Philippe Brucker

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IOMMU Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-iommu/0 linux-iommu/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-iommu linux-iommu/ https://lore.kernel.org/linux-iommu \
		iommu@lists.linux-foundation.org
	public-inbox-index linux-iommu

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.linux-foundation.lists.iommu


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git