Re: [PATCH RFC 1/1] iommu: set the default iommu-dma mode as non-strict

2019-03-06 Thread John Garry
(VFIO) is untrusted, ok. But a malicious driver loaded into the kernel address space would have much easier ways to corrupt the system than to exploit lazy mode... Yes, so that we have no need to consider untrusted drivers. For (3), I agree that we should at least disallow lazy mode if pc

Re: [PATCH RFC 1/1] iommu: set the default iommu-dma mode as non-strict

2019-03-06 Thread Leizhen (ThunderTown)
On 2019/3/4 23:52, Robin Murphy wrote: > On 02/03/2019 06:12, Leizhen (ThunderTown) wrote: >> >> >> On 2019/3/1 19:07, Jean-Philippe Brucker wrote: >>> Hi Leizhen, >>> >>> On 01/03/2019 04:44, Leizhen (ThunderTown) wrote: On 2019/2/26 20:36, Hanjun Guo wrote: > Hi Jean, >

Re: [PATCH RFC 1/1] iommu: set the default iommu-dma mode as non-strict

2019-03-04 Thread Robin Murphy
On 02/03/2019 06:12, Leizhen (ThunderTown) wrote: On 2019/3/1 19:07, Jean-Philippe Brucker wrote: Hi Leizhen, On 01/03/2019 04:44, Leizhen (ThunderTown) wrote: On 2019/2/26 20:36, Hanjun Guo wrote: Hi Jean, On 2019/1/31 22:55, Jean-Philippe Brucker wrote: Hi, On 31/01/2019 13:52, Zhen

Re: [PATCH RFC 1/1] iommu: set the default iommu-dma mode as non-strict

2019-03-01 Thread Leizhen (ThunderTown)
On 2019/3/1 19:07, Jean-Philippe Brucker wrote: > Hi Leizhen, > > On 01/03/2019 04:44, Leizhen (ThunderTown) wrote: >> >> >> On 2019/2/26 20:36, Hanjun Guo wrote: >>> Hi Jean, >>> >>> On 2019/1/31 22:55, Jean-Philippe Brucker wrote: Hi, On 31/01/2019 13:52, Zhen Lei wrote: >

Re: [PATCH RFC 1/1] iommu: set the default iommu-dma mode as non-strict

2019-03-01 Thread Jean-Philippe Brucker
Hi Leizhen, On 01/03/2019 04:44, Leizhen (ThunderTown) wrote: > > > On 2019/2/26 20:36, Hanjun Guo wrote: >> Hi Jean, >> >> On 2019/1/31 22:55, Jean-Philippe Brucker wrote: >>> Hi, >>> >>> On 31/01/2019 13:52, Zhen Lei wrote: Currently, many peripherals are faster than before. For example,

Re: [PATCH RFC 1/1] iommu: set the default iommu-dma mode as non-strict

2019-02-28 Thread Leizhen (ThunderTown)
On 2019/2/26 20:36, Hanjun Guo wrote: > Hi Jean, > > On 2019/1/31 22:55, Jean-Philippe Brucker wrote: >> Hi, >> >> On 31/01/2019 13:52, Zhen Lei wrote: >>> Currently, many peripherals are faster than before. For example, the top >>> speed of the older netcard is 10Gb/s, and now it's more than 2

Re: [PATCH RFC 1/1] iommu: set the default iommu-dma mode as non-strict

2019-02-26 Thread Hanjun Guo
Hi Jean, On 2019/1/31 22:55, Jean-Philippe Brucker wrote: > Hi, > > On 31/01/2019 13:52, Zhen Lei wrote: >> Currently, many peripherals are faster than before. For example, the top >> speed of the older netcard is 10Gb/s, and now it's more than 25Gb/s. But >> when iommu page-table mapping enabled

Re: [PATCH RFC 1/1] iommu: set the default iommu-dma mode as non-strict

2019-01-31 Thread Jean-Philippe Brucker
Hi, On 31/01/2019 13:52, Zhen Lei wrote: > Currently, many peripherals are faster than before. For example, the top > speed of the older netcard is 10Gb/s, and now it's more than 25Gb/s. But > when iommu page-table mapping enabled, it's hard to reach the top speed > in strict mode, because of freq

[PATCH RFC 1/1] iommu: set the default iommu-dma mode as non-strict

2019-01-31 Thread Zhen Lei
Currently, many peripherals are faster than before. For example, the top speed of the older netcard is 10Gb/s, and now it's more than 25Gb/s. But when iommu page-table mapping enabled, it's hard to reach the top speed in strict mode, because of frequently map and unmap operations. In order to keep