From: Yongji Xie <xyjxie@linux.vnet.ibm.com>
To: "Tian, Kevin" <kevin.tian@intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>
Cc: "alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"aik@ozlabs.ru" <aik@ozlabs.ru>,
"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
"paulus@samba.org" <paulus@samba.org>,
"mpe@ellerman.id.au" <mpe@ellerman.id.au>,
"joro@8bytes.org" <joro@8bytes.org>,
"warrier@linux.vnet.ibm.com" <warrier@linux.vnet.ibm.com>,
"zhong@linux.vnet.ibm.com" <zhong@linux.vnet.ibm.com>,
"nikunj@linux.vnet.ibm.com" <nikunj@linux.vnet.ibm.com>,
"eric.auger@linaro.org" <eric.auger@linaro.org>,
"will.deacon@arm.com" <will.deacon@arm.com>,
"gwshan@linux.vnet.ibm.com" <gwshan@linux.vnet.ibm.com>,
"David.Laight@ACULAB.COM" <David.Laight@ACULAB.COM>,
"alistair@popple.id.au" <alistair@popple.id.au>,
"ruscur@russell.cc" <ruscur@russell.cc>
Subject: Re: [PATCH 5/5] vfio-pci: Allow to mmap MSI-X table if interrupt remapping is supported
Date: Tue, 3 May 2016 14:08:22 +0800 [thread overview]
Message-ID: <f7d73ac3-470d-a0d2-0a97-05be630480dd@linux.vnet.ibm.com> (raw)
In-Reply-To: <AADFC41AFE54684AB9EE6CBC0274A5D15F842512@SHSMSX101.ccr.corp.intel.com>
On 2016/5/3 13:34, Tian, Kevin wrote:
>> From: Yongji Xie
>> Sent: Wednesday, April 27, 2016 8:43 PM
>>
>> This patch enables mmapping MSI-X tables if hardware supports
>> interrupt remapping which can ensure that a given pci device
>> can only shoot the MSIs assigned for it.
>>
>> With MSI-X table mmapped, we also need to expose the
>> read/write interface which will be used to access MSI-X table.
>>
>> Signed-off-by: Yongji Xie <xyjxie@linux.vnet.ibm.com>
> A curious question here. Does "allow to mmap MSI-X" essentially
> mean that KVM guest can directly read/write physical MSI-X
> structure then?
>
> Thanks
> Kevin
>
Here we just allow to mmap MSI-X table in kernel. It doesn't
mean all KVM guest can directly read/write physical MSI-X
structure. This should be decided by QEMU. For PPC64
platform, we would allow to passthrough the MSI-X table
because we know guest kernel would not write physical
MSI-X structure when enabling MSI.
Thanks,
Yongji
next prev parent reply other threads:[~2016-05-03 6:09 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-27 12:43 [PATCH 0/5] vfio-pci: Add support for mmapping MSI-X table Yongji Xie
2016-04-27 12:43 ` [PATCH 1/5] PCI: Add a new PCI_BUS_FLAGS_MSI_REMAP flag Yongji Xie
2016-05-24 20:55 ` Bjorn Helgaas
2016-05-25 5:46 ` Yongji Xie
2016-04-27 12:43 ` [PATCH 2/5] iommu: Set PCI_BUS_FLAGS_MSI_REMAP if IOMMU have capability of IRQ remapping Yongji Xie
2016-05-24 21:11 ` Bjorn Helgaas
2016-05-25 5:54 ` Yongji Xie
[not found] ` <201605250554.u4P5sRqv014439@mx0a-001b2d01.pphosted.com>
2016-05-26 3:48 ` Bjorn Helgaas
2016-04-27 12:43 ` [PATCH 3/5] PCI: Set PCI_BUS_FLAGS_MSI_REMAP if MSI controller supports " Yongji Xie
2016-05-24 21:04 ` Bjorn Helgaas
2016-05-25 5:48 ` Yongji Xie
2016-04-27 12:43 ` [PATCH 4/5] pci-ioda: Set PCI_BUS_FLAGS_MSI_REMAP for IODA host bridge Yongji Xie
2016-05-06 6:34 ` Alexey Kardashevskiy
2016-04-27 12:43 ` [PATCH 5/5] vfio-pci: Allow to mmap MSI-X table if interrupt remapping is supported Yongji Xie
2016-05-03 5:34 ` Tian, Kevin
2016-05-03 6:08 ` Yongji Xie [this message]
2016-05-03 6:22 ` Tian, Kevin
2016-05-03 7:34 ` Yongji Xie
2016-05-05 9:36 ` Tian, Kevin
2016-05-05 9:54 ` David Laight
2016-05-05 11:42 ` Yongji Xie
2016-05-05 12:15 ` Tian, Kevin
2016-05-05 13:28 ` Yongji Xie
2016-05-05 15:05 ` Alex Williamson
2016-05-06 6:35 ` Alexey Kardashevskiy
2016-05-06 16:54 ` Alex Williamson
2016-05-11 6:29 ` Tian, Kevin
2016-05-11 15:53 ` Alex Williamson
2016-05-12 1:19 ` Tian, Kevin
2016-05-12 2:20 ` Alex Williamson
2016-05-12 4:53 ` Tian, Kevin
2016-05-12 17:47 ` Alex Williamson
2016-05-13 2:33 ` Tian, Kevin
2016-05-13 5:32 ` Alex Williamson
2016-05-13 6:50 ` Tian, Kevin
2016-05-13 16:42 ` Alex Williamson
2016-05-13 9:16 ` David Laight
2016-05-13 2:36 ` Tian, Kevin
2016-05-05 11:44 ` Yongji Xie
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