Re: [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-09-17 Thread Julien Grall
Hi, On 9/17/19 1:28 PM, Volodymyr Babchuk wrote: Hi Julien, Julien Grall writes: Hi Volodymyr, On 9/16/19 4:26 PM, Volodymyr Babchuk wrote: Hi Julien, Julien Grall writes: Hi, On 9/12/19 8:45 PM, Volodymyr Babchuk wrote: Hi Julien, Julien Grall writes: Hi Volodymyr, On 9/11/19

Re: [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-09-17 Thread Volodymyr Babchuk
Hi Julien, Julien Grall writes: > Hi Volodymyr, > > On 9/16/19 4:26 PM, Volodymyr Babchuk wrote: >> >> Hi Julien, >> >> Julien Grall writes: >> >>> Hi, >>> >>> On 9/12/19 8:45 PM, Volodymyr Babchuk wrote: Hi Julien, Julien Grall writes: > Hi Volodymyr, > > O

Re: [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-09-17 Thread Julien Grall
Hi Volodymyr, On 9/16/19 4:26 PM, Volodymyr Babchuk wrote: Hi Julien, Julien Grall writes: Hi, On 9/12/19 8:45 PM, Volodymyr Babchuk wrote: Hi Julien, Julien Grall writes: Hi Volodymyr, On 9/11/19 7:48 PM, Volodymyr Babchuk wrote: Julien Grall writes: Hi Volodymyr, On 8/23/19 7:4

Re: [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-09-16 Thread Volodymyr Babchuk
Hi Julien, Julien Grall writes: > Hi, > > On 9/12/19 8:45 PM, Volodymyr Babchuk wrote: >> >> Hi Julien, >> >> Julien Grall writes: >> >>> Hi Volodymyr, >>> >>> On 9/11/19 7:48 PM, Volodymyr Babchuk wrote: Julien Grall writes: > Hi Volodymyr, > > On 8/23/19 7:48 PM, Vol

Re: [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-09-12 Thread Julien Grall
Hi, On 9/12/19 8:45 PM, Volodymyr Babchuk wrote: Hi Julien, Julien Grall writes: Hi Volodymyr, On 9/11/19 7:48 PM, Volodymyr Babchuk wrote: Julien Grall writes: Hi Volodymyr, On 8/23/19 7:48 PM, Volodymyr Babchuk wrote: We want to limit number of calls to lookup_and_pin_guest_ram_addr

Re: [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-09-12 Thread Volodymyr Babchuk
Hi Julien, Julien Grall writes: > Hi Volodymyr, > > On 9/11/19 7:48 PM, Volodymyr Babchuk wrote: >> >> Julien Grall writes: >> >>> Hi Volodymyr, >>> >>> On 8/23/19 7:48 PM, Volodymyr Babchuk wrote: We want to limit number of calls to lookup_and_pin_guest_ram_addr() per one request. The

Re: [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-09-12 Thread Julien Grall
Hi Volodymyr, On 9/11/19 7:48 PM, Volodymyr Babchuk wrote: Julien Grall writes: Hi Volodymyr, On 8/23/19 7:48 PM, Volodymyr Babchuk wrote: We want to limit number of calls to lookup_and_pin_guest_ram_addr() per one request. There are two ways to do this: either preempt translate_noncontig()

Re: [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-09-11 Thread Volodymyr Babchuk
Julien Grall writes: > Hi Volodymyr, > > On 8/23/19 7:48 PM, Volodymyr Babchuk wrote: >> We want to limit number of calls to lookup_and_pin_guest_ram_addr() >> per one request. There are two ways to do this: either preempt >> translate_noncontig() or to limit size of one shared buffer size. >> >>

Re: [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-09-09 Thread Julien Grall
Hi Volodymyr, On 8/23/19 7:48 PM, Volodymyr Babchuk wrote: We want to limit number of calls to lookup_and_pin_guest_ram_addr() per one request. There are two ways to do this: either preempt translate_noncontig() or to limit size of one shared buffer size. It is quite hard to preempt translate_n

[Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size

2019-08-23 Thread Volodymyr Babchuk
We want to limit number of calls to lookup_and_pin_guest_ram_addr() per one request. There are two ways to do this: either preempt translate_noncontig() or to limit size of one shared buffer size. It is quite hard to preempt translate_noncontig(), because it is deep nested. So we chose second opti