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From: Peter Xu <peterx@redhat.com>
To: Liu Yi L <yi.l.liu@intel.com>
Cc: jean-philippe@linaro.org, kevin.tian@intel.com,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	Yi Sun <yi.y.sun@linux.intel.com>,
	Eduardo Habkost <ehabkost@redhat.com>,
	kvm@vger.kernel.org, mst@redhat.com, jun.j.tian@intel.com,
	qemu-devel@nongnu.org, eric.auger@redhat.com,
	alex.williamson@redhat.com, pbonzini@redhat.com,
	hao.wu@intel.com, yi.y.sun@intel.com,
	Richard Henderson <rth@twiddle.net>,
	david@gibson.dropbear.id.au
Subject: Re: [PATCH v1 07/22] intel_iommu: add set/unset_iommu_context callback
Date: Mon, 23 Mar 2020 17:29:11 -0400
Message-ID: <20200323212911.GQ127076@xz-x1> (raw)
In-Reply-To: <1584880579-12178-8-git-send-email-yi.l.liu@intel.com>

On Sun, Mar 22, 2020 at 05:36:04AM -0700, Liu Yi L wrote:
> This patch adds set/unset_iommu_context() impelementation in Intel
> vIOMMU. For Intel platform, pass-through modules (e.g. VFIO) could
> set HostIOMMUContext to Intel vIOMMU emulator.
> 
> Cc: Kevin Tian <kevin.tian@intel.com>
> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
> Cc: Peter Xu <peterx@redhat.com>
> Cc: Yi Sun <yi.y.sun@linux.intel.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Richard Henderson <rth@twiddle.net>
> Cc: Eduardo Habkost <ehabkost@redhat.com>
> Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> ---
>  hw/i386/intel_iommu.c         | 70 +++++++++++++++++++++++++++++++++++++++----
>  include/hw/i386/intel_iommu.h | 17 +++++++++--
>  2 files changed, 80 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 4b22910..8d9204f 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -3354,23 +3354,35 @@ static const MemoryRegionOps vtd_mem_ir_ops = {
>      },
>  };
>  
> -VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn)
> +/**
> + * Fetch a VTDBus instance for given PCIBus. If no existing instance,
> + * allocate one.
> + */
> +static VTDBus *vtd_find_add_bus(IntelIOMMUState *s, PCIBus *bus)
>  {
>      uintptr_t key = (uintptr_t)bus;
>      VTDBus *vtd_bus = g_hash_table_lookup(s->vtd_as_by_busptr, &key);
> -    VTDAddressSpace *vtd_dev_as;
> -    char name[128];
>  
>      if (!vtd_bus) {
>          uintptr_t *new_key = g_malloc(sizeof(*new_key));
>          *new_key = (uintptr_t)bus;
>          /* No corresponding free() */
> -        vtd_bus = g_malloc0(sizeof(VTDBus) + sizeof(VTDAddressSpace *) * \
> -                            PCI_DEVFN_MAX);
> +        vtd_bus = g_malloc0(sizeof(VTDBus) + PCI_DEVFN_MAX * \
> +                            (sizeof(VTDAddressSpace *) + \
> +                             sizeof(VTDHostIOMMUContext *)));

IIRC I commented on this before...  Shouldn't sizeof(VTDBus) be
enough?

>          vtd_bus->bus = bus;
>          g_hash_table_insert(s->vtd_as_by_busptr, new_key, vtd_bus);
>      }
> +    return vtd_bus;
> +}
> +
> +VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn)
> +{
> +    VTDBus *vtd_bus;
> +    VTDAddressSpace *vtd_dev_as;
> +    char name[128];
>  
> +    vtd_bus = vtd_find_add_bus(s, bus);
>      vtd_dev_as = vtd_bus->dev_as[devfn];
>  
>      if (!vtd_dev_as) {
> @@ -3436,6 +3448,52 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn)
>      return vtd_dev_as;
>  }
>  
> +static int vtd_dev_set_iommu_context(PCIBus *bus, void *opaque,
> +                                     int devfn,
> +                                     HostIOMMUContext *host_icx)
> +{
> +    IntelIOMMUState *s = opaque;
> +    VTDBus *vtd_bus;
> +    VTDHostIOMMUContext *vtd_dev_icx;
> +
> +    assert(0 <= devfn && devfn < PCI_DEVFN_MAX);
> +
> +    vtd_bus = vtd_find_add_bus(s, bus);
> +
> +    vtd_iommu_lock(s);
> +    vtd_dev_icx = vtd_bus->dev_icx[devfn];
> +
> +    if (!vtd_dev_icx) {

We can assert this directly I think, in case we accidentally set the
context twice without notice.

> +        vtd_bus->dev_icx[devfn] = vtd_dev_icx =
> +                    g_malloc0(sizeof(VTDHostIOMMUContext));
> +        vtd_dev_icx->vtd_bus = vtd_bus;
> +        vtd_dev_icx->devfn = (uint8_t)devfn;
> +        vtd_dev_icx->iommu_state = s;
> +        vtd_dev_icx->host_icx = host_icx;
> +    }
> +    vtd_iommu_unlock(s);
> +
> +    return 0;
> +}
> +
> +static void vtd_dev_unset_iommu_context(PCIBus *bus, void *opaque, int devfn)
> +{
> +    IntelIOMMUState *s = opaque;
> +    VTDBus *vtd_bus;
> +    VTDHostIOMMUContext *vtd_dev_icx;
> +
> +    assert(0 <= devfn && devfn < PCI_DEVFN_MAX);
> +
> +    vtd_bus = vtd_find_add_bus(s, bus);
> +
> +    vtd_iommu_lock(s);
> +
> +    vtd_dev_icx = vtd_bus->dev_icx[devfn];
> +    g_free(vtd_dev_icx);

Better set it as NULL, and can also drop vtd_dev_icx which seems
meaningless..

       g_free(vtd_bus->dev_icx[devfn]);
       vtd_bus->dev_icx[devfn] = NULL;

> +
> +    vtd_iommu_unlock(s);
> +}
> +
>  static uint64_t get_naturally_aligned_size(uint64_t start,
>                                             uint64_t size, int gaw)
>  {
> @@ -3731,6 +3789,8 @@ static AddressSpace *vtd_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
>  
>  static PCIIOMMUOps vtd_iommu_ops = {
>      .get_address_space = vtd_host_dma_iommu,
> +    .set_iommu_context = vtd_dev_set_iommu_context,
> +    .unset_iommu_context = vtd_dev_unset_iommu_context,
>  };
>  
>  static bool vtd_decide_config(IntelIOMMUState *s, Error **errp)
> diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
> index 3870052..9b4fc0a 100644
> --- a/include/hw/i386/intel_iommu.h
> +++ b/include/hw/i386/intel_iommu.h
> @@ -64,6 +64,7 @@ typedef union VTD_IR_TableEntry VTD_IR_TableEntry;
>  typedef union VTD_IR_MSIAddress VTD_IR_MSIAddress;
>  typedef struct VTDPASIDDirEntry VTDPASIDDirEntry;
>  typedef struct VTDPASIDEntry VTDPASIDEntry;
> +typedef struct VTDHostIOMMUContext VTDHostIOMMUContext;
>  
>  /* Context-Entry */
>  struct VTDContextEntry {
> @@ -112,10 +113,20 @@ struct VTDAddressSpace {
>      IOVATree *iova_tree;          /* Traces mapped IOVA ranges */
>  };
>  
> +struct VTDHostIOMMUContext {
> +    VTDBus *vtd_bus;
> +    uint8_t devfn;
> +    HostIOMMUContext *host_icx;
> +    IntelIOMMUState *iommu_state;
> +};
> +
>  struct VTDBus {
> -    PCIBus* bus;		/* A reference to the bus to provide translation for */
> +    /* A reference to the bus to provide translation for */
> +    PCIBus *bus;
>      /* A table of VTDAddressSpace objects indexed by devfn */
> -    VTDAddressSpace *dev_as[];
> +    VTDAddressSpace *dev_as[PCI_DEVFN_MAX];
> +    /* A table of VTDHostIOMMUContext objects indexed by devfn */
> +    VTDHostIOMMUContext *dev_icx[PCI_DEVFN_MAX];
>  };
>  
>  struct VTDIOTLBEntry {
> @@ -271,6 +282,8 @@ struct IntelIOMMUState {
>      /*
>       * Protects IOMMU states in general.  Currently it protects the
>       * per-IOMMU IOTLB cache, and context entry cache in VTDAddressSpace.
> +     * Protect the update/usage of HostIOMMUContext pointer cached in
> +     * VTDBus->dev_icx array as array elements may be updated by hotplug

I think the context update does not need to be updated, because they
should always be with the BQL, right?

Thanks,

>       */
>      QemuMutex iommu_lock;
>  };
> -- 
> 2.7.4
> 

-- 
Peter Xu



  reply index

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-22 12:35 [PATCH v1 00/22] intel_iommu: expose Shared Virtual Addressing to VMs Liu Yi L
2020-03-22 12:35 ` [PATCH v1 01/22] scripts/update-linux-headers: Import iommu.h Liu Yi L
2020-03-22 12:35 ` [PATCH v1 02/22] header file update VFIO/IOMMU vSVA APIs Liu Yi L
2020-03-29 16:32   ` Auger Eric
2020-03-30  7:06     ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 03/22] vfio: check VFIO_TYPE1_NESTING_IOMMU support Liu Yi L
2020-03-22 12:36 ` [PATCH v1 04/22] hw/iommu: introduce HostIOMMUContext Liu Yi L
2020-03-23 20:58   ` Peter Xu
2020-03-24 10:00     ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 05/22] hw/pci: modify pci_setup_iommu() to set PCIIOMMUOps Liu Yi L
2020-03-22 12:36 ` [PATCH v1 06/22] hw/pci: introduce pci_device_set/unset_iommu_context() Liu Yi L
2020-03-23 21:15   ` Peter Xu
2020-03-24 10:02     ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 07/22] intel_iommu: add set/unset_iommu_context callback Liu Yi L
2020-03-23 21:29   ` Peter Xu [this message]
2020-03-24 11:15     ` Liu, Yi L
2020-03-24 15:24       ` Peter Xu
2020-03-25  9:37         ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 08/22] vfio: init HostIOMMUContext per-container Liu Yi L
     [not found]   ` <20200323213943.GR127076@xz-x1>
2020-03-24 13:03     ` Liu, Yi L
2020-03-24 14:45       ` Peter Xu
2020-03-25  9:30         ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 09/22] vfio/common: check PASID alloc/free availability Liu Yi L
2020-03-23 22:06   ` Peter Xu
2020-03-24 11:18     ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 10/22] intel_iommu: add virtual command capability support Liu Yi L
2020-03-22 12:36 ` [PATCH v1 11/22] intel_iommu: process PASID cache invalidation Liu Yi L
2020-03-22 12:36 ` [PATCH v1 12/22] intel_iommu: add PASID cache management infrastructure Liu Yi L
2020-03-24 17:32   ` Peter Xu
2020-03-25 12:20     ` Liu, Yi L
2020-03-25 14:52       ` Peter Xu
2020-03-26  6:15         ` Liu, Yi L
2020-03-26 13:57           ` Liu, Yi L
2020-03-26 15:53             ` Peter Xu
2020-03-27  1:33               ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 13/22] vfio: add bind stage-1 page table support Liu Yi L
2020-03-24 17:41   ` Peter Xu
2020-03-25  9:49     ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 14/22] intel_iommu: bind/unbind guest page table to host Liu Yi L
2020-03-24 17:46   ` Peter Xu
2020-03-25 12:42     ` Liu, Yi L
2020-03-25 14:56       ` Peter Xu
2020-03-26  3:04         ` Liu, Yi L
2020-03-25 12:47     ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 15/22] intel_iommu: replay guest pasid bindings " Liu Yi L
2020-03-24 18:00   ` Peter Xu
2020-03-25 13:14     ` Liu, Yi L
2020-03-25 15:06       ` Peter Xu
2020-03-26  3:17         ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 16/22] intel_iommu: replay pasid binds after context cache invalidation Liu Yi L
2020-03-24 18:07   ` Peter Xu
2020-03-25 13:18     ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 17/22] intel_iommu: do not pass down pasid bind for PASID #0 Liu Yi L
2020-03-24 18:13   ` Peter Xu
2020-03-25 10:42     ` Liu, Yi L
2020-03-25 15:12       ` Peter Xu
2020-03-26  2:42         ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 18/22] vfio: add support for flush iommu stage-1 cache Liu Yi L
2020-03-24 18:19   ` Peter Xu
2020-03-25 10:40     ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 19/22] intel_iommu: process PASID-based iotlb invalidation Liu Yi L
2020-03-24 18:26   ` Peter Xu
2020-03-25 13:36     ` Liu, Yi L
2020-03-25 15:15       ` Peter Xu
2020-03-29 11:17         ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 20/22] intel_iommu: propagate PASID-based iotlb invalidation to host Liu Yi L
2020-03-24 18:34   ` Peter Xu
2020-03-25 13:21     ` Liu, Yi L
2020-03-26  5:41       ` Liu, Yi L
2020-03-26 13:02         ` Peter Xu
2020-03-26 13:22           ` Peter Xu
2020-03-26 13:33             ` Liu, Yi L
2020-03-26 13:23           ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 21/22] intel_iommu: process PASID-based Device-TLB invalidation Liu Yi L
2020-03-24 18:36   ` Peter Xu
2020-03-25  9:19     ` Liu, Yi L
2020-03-22 12:36 ` [PATCH v1 22/22] intel_iommu: modify x-scalable-mode to be string option Liu Yi L
2020-03-24 18:39   ` Peter Xu
2020-03-25 13:22     ` Liu, Yi L
2020-03-22 13:25 ` [PATCH v1 00/22] intel_iommu: expose Shared Virtual Addressing to VMs no-reply

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