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From: "Liu, Yi L" <yi.l.liu@intel.com>
To: Peter Xu <peterx@redhat.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"david@gibson.dropbear.id.au" <david@gibson.dropbear.id.au>,
	"pbonzini@redhat.com" <pbonzini@redhat.com>,
	"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
	"mst@redhat.com" <mst@redhat.com>,
	"eric.auger@redhat.com" <eric.auger@redhat.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	"Tian, Jun J" <jun.j.tian@intel.com>,
	"Sun, Yi Y" <yi.y.sun@intel.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"Wu, Hao" <hao.wu@intel.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	Yi Sun <yi.y.sun@linux.intel.com>,
	Richard Henderson <rth@twiddle.net>,
	"Eduardo Habkost" <ehabkost@redhat.com>
Subject: RE: [RFC v3 16/25] intel_iommu: add PASID cache management infrastructure
Date: Sat, 15 Feb 2020 08:50:20 +0000
Message-ID: <A2975661238FB949B60364EF0F2C25743A1BE87E@SHSMSX104.ccr.corp.intel.com> (raw)
In-Reply-To: <20200213151415.GC1103216@xz-x1>



> -----Original Message-----
> From: Peter Xu <peterx@redhat.com>
> Sent: Thursday, February 13, 2020 11:14 PM
> To: Liu, Yi L <yi.l.liu@intel.com>
> Subject: Re: [RFC v3 16/25] intel_iommu: add PASID cache management
> infrastructure
> 
> On Thu, Feb 13, 2020 at 02:59:37AM +0000, Liu, Yi L wrote:
> > > - Remove the vtd_pasid_as check right below because it's not needed.
> > >
> > > >
> > > >
> > > > > > +        if (vtd_pasid_as &&
> > >                    ^^^^^^^^^^^^
> >
> > yes, it is. In current series vtd_add_find_pasid_as() doesn’t check the
> > result of vtd_pasid_as mem allocation, so no need to check vtd_pasid_as
> > here either. However, it might be better to check the allocation result
> > or it will result in issue if allocation failed. What's your preference
> > here?
> 
> That should not be needed, because IIRC g_malloc0() will directly
> coredump if allocation fails.  Even if not, it'll coredump in
> vtd_add_find_pasid_as() soon when accessing the NULL pointer.

Cool, thanks for this message. Then I'll follow your suggestion  to  remove
the vtd_pasid_as check.

Regards,
Yi Liu

  reply index

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-29 12:16 [RFC v3 00/25] intel_iommu: expose Shared Virtual Addressing to VMs Liu, Yi L
2020-01-29 12:16 ` [RFC v3 01/25] hw/pci: modify pci_setup_iommu() to set PCIIOMMUOps Liu, Yi L
2020-01-29 12:16 ` [RFC v3 02/25] hw/iommu: introduce DualStageIOMMUObject Liu, Yi L
2020-01-31  3:59   ` David Gibson
2020-01-31 11:42     ` Liu, Yi L
2020-02-12  6:32       ` David Gibson
2020-01-29 12:16 ` [RFC v3 03/25] hw/iommu: introduce IOMMUContext Liu, Yi L
2020-01-31  4:06   ` David Gibson
2020-01-31 11:42     ` Liu, Yi L
2020-02-11 16:58       ` Peter Xu
2020-02-12  7:15         ` Liu, Yi L
2020-02-12 15:59           ` Peter Xu
2020-02-13  2:46             ` Liu, Yi L
2020-02-14  5:36           ` David Gibson
2020-02-15  6:25             ` Liu, Yi L
2020-01-29 12:16 ` [RFC v3 04/25] hw/pci: introduce pci_device_iommu_context() Liu, Yi L
2020-01-29 12:16 ` [RFC v3 05/25] intel_iommu: provide get_iommu_context() callback Liu, Yi L
2020-01-29 12:16 ` [RFC v3 06/25] scripts/update-linux-headers: Import iommu.h Liu, Yi L
2020-01-29 12:25   ` Cornelia Huck
2020-01-31 11:40     ` Liu, Yi L
2020-01-29 12:16 ` [RFC v3 07/25] header file update VFIO/IOMMU vSVA APIs Liu, Yi L
2020-01-29 12:28   ` Cornelia Huck
2020-01-31 11:41     ` Liu, Yi L
2020-01-29 12:16 ` [RFC v3 08/25] vfio: pass IOMMUContext into vfio_get_group() Liu, Yi L
2020-01-29 12:16 ` [RFC v3 09/25] vfio: check VFIO_TYPE1_NESTING_IOMMU support Liu, Yi L
2020-02-11 19:08   ` Peter Xu
2020-02-12  7:16     ` Liu, Yi L
2020-01-29 12:16 ` [RFC v3 10/25] vfio: register DualStageIOMMUObject to vIOMMU Liu, Yi L
2020-01-29 12:16 ` [RFC v3 11/25] vfio: get stage-1 pasid formats from Kernel Liu, Yi L
2020-02-11 19:30   ` Peter Xu
2020-02-12  7:19     ` Liu, Yi L
2020-01-29 12:16 ` [RFC v3 12/25] vfio/common: add pasid_alloc/free support Liu, Yi L
2020-02-11 19:31   ` Peter Xu
2020-02-12  7:20     ` Liu, Yi L
2020-01-29 12:16 ` [RFC v3 13/25] intel_iommu: modify x-scalable-mode to be string option Liu, Yi L
2020-02-11 19:43   ` Peter Xu
2020-02-12  7:28     ` Liu, Yi L
2020-02-12 16:05       ` Peter Xu
2020-02-13  2:44         ` Liu, Yi L
2020-01-29 12:16 ` [RFC v3 14/25] intel_iommu: add virtual command capability support Liu, Yi L
2020-02-11 20:16   ` Peter Xu
2020-02-12  7:32     ` Liu, Yi L
2020-02-11 21:56   ` Peter Xu
2020-02-13  2:40     ` Liu, Yi L
2020-02-13 14:31       ` Peter Xu
2020-02-13 15:08         ` Peter Xu
2020-02-15  8:49           ` Liu, Yi L
2020-01-29 12:16 ` [RFC v3 15/25] intel_iommu: process pasid cache invalidation Liu, Yi L
2020-02-11 20:17   ` Peter Xu
2020-02-12  7:33     ` Liu, Yi L
2020-01-29 12:16 ` [RFC v3 16/25] intel_iommu: add PASID cache management infrastructure Liu, Yi L
2020-02-11 23:35   ` Peter Xu
2020-02-12  8:37     ` Liu, Yi L
2020-02-12 15:26       ` Peter Xu
2020-02-13  2:59         ` Liu, Yi L
2020-02-13 15:14           ` Peter Xu
2020-02-15  8:50             ` Liu, Yi L [this message]
2020-01-29 12:16 ` [RFC v3 17/25] vfio: add bind stage-1 page table support Liu, Yi L
2020-01-29 12:16 ` [RFC v3 18/25] intel_iommu: bind/unbind guest page table to host Liu, Yi L
2020-01-29 12:16 ` [RFC v3 19/25] intel_iommu: replay guest pasid bindings " Liu, Yi L
2020-01-29 12:16 ` [RFC v3 20/25] intel_iommu: replay pasid binds after context cache invalidation Liu, Yi L
2020-01-29 12:16 ` [RFC v3 21/25] intel_iommu: do not pass down pasid bind for PASID #0 Liu, Yi L
2020-01-29 12:16 ` [RFC v3 22/25] vfio: add support for flush iommu stage-1 cache Liu, Yi L
2020-01-29 12:16 ` [RFC v3 23/25] intel_iommu: process PASID-based iotlb invalidation Liu, Yi L
2020-01-29 12:16 ` [RFC v3 24/25] intel_iommu: propagate PASID-based iotlb invalidation to host Liu, Yi L
2020-01-29 12:16 ` [RFC v3 25/25] intel_iommu: process PASID-based Device-TLB invalidation Liu, Yi L
2020-01-29 13:44 ` [RFC v3 00/25] intel_iommu: expose Shared Virtual Addressing to VMs no-reply
2020-01-29 13:48 ` no-reply

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