Re: KVM/ARM: How to read the value of some physical address in HYP mode

2015-08-19 Thread Christoffer Dall 
On Mon, Aug 17, 2015 at 09:59:20AM +0800, harry wrote:
 Hi, 
 
 
 I want to read the value of some physical address in HYP mode. But maybe 
 there isn't any interface to achieve this. I hope to get some ideas to 
 achieve this.
 

If I understand your question correctly, you simply have to map the
physical address into hyp mode's virtual address space and read from
that address.

-Christoffer

 
 And now I have a simple idea, but I don't know if it is possible. When the 
 HYP mode is init, we create a mapping from one special virtual address to 
 some physical address. And map the va to HYP mode. When we want to read the 
 value of some PA, we modify the page table to let the special VA map to the 
 PA, then we read the special VA and get the value of the PA. Because I only 
 start to research on the KVM, so I am not sure if this can work. I hope to 
 get help to achieve this.
 
 
 Thanks and regards,
 Harry

 ___
 kvmarm mailing list
 kvmarm@lists.cs.columbia.edu
 https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

___
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

KVM/ARM: How to read the value of some physical address in HYP mode

2015-08-16 Thread harry 
Hi, 


I want to read the value of some physical address in HYP mode. But maybe there 
isn't any interface to achieve this. I hope to get some ideas to achieve this.


And now I have a simple idea, but I don't know if it is possible. When the HYP 
mode is init, we create a mapping from one special virtual address to some 
physical address. And map the va to HYP mode. When we want to read the value of 
some PA, we modify the page table to let the special VA map to the PA, then we 
read the special VA and get the value of the PA. Because I only start to 
research on the KVM, so I am not sure if this can work. I hope to get help to 
achieve this.


Thanks and regards,
Harry___
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm