Re: [Qemu-devel] Physical address debugging

[Blue Swirl]

2011/8/29 Avi Kivity <address@hidden>:
> On 08/26/2011 08:34 PM, Blue Swirl wrote:
>>
>> >  Indeed, it isn't. It's impossible with KVM (due to lacking hardware
>> >  support) but would be feasible with TCG if you extend (or ad-hoc hack)
>> >  QEMU code accordingly.
>>
>> Why impossible? The existing watchpoints replace original physical
>> memory with io_mem_watch MMIO, virtual addresses are translated to
>> physical in exec.c:tlb_set_page(). The only missing piece is to allow
>> setting watchpoints with physical addresses directly.
>>
>> Since KVM can handle MMIO, I think it should also be able to handle
>> watchpoints.
>>
>
> Not on RAM areas.

But isn't it possible to unmap one page of RAM and replace that by
MMIO page on KVM, is this because of the memory slots? Does your
memory work help?