Re: [PATCH v2] KVM: introduce readonly memory region

[Avi Kivity]

On 05/24/2012 12:59 PM, Gleb Natapov wrote:
> On Thu, May 24, 2012 at 05:24:34PM +0800, Xiao Guangrong wrote:
>> In current code, if we map a readonly memory space from host to guest
>> and the page is not currently mapped in the host, we will get a fault-pfn
>> and async is not allowed, then the vm will crash
>> 
>> Address Avi's idea, we introduce readonly memory region to map ROM/ROMD
>> to the guest
>> 
> As far as I can tell this implements only ROMD. i.e write access to read
> only slot will generate IO exit.

Which userspace can then ignore.  The question is whether writes to ROM
are frequent, and whether the performance in that case matters.


-- 
error compiling committee.c: too many arguments to function
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/