Re: [Qemu-devel] [PATCH, RFT] monitor: implement x86 info tlb for PAE and long modes

[Blue Swirl]

On Tue, Dec 7, 2010 at 10:08 AM, Alexander Graf <address@hidden> wrote:
>
> On 06.12.2010, at 19:38, Blue Swirl wrote:
>
>> On Mon, Dec 6, 2010 at 11:12 AM, Alexander Graf <address@hidden> wrote:
>>>
>>> On 05.12.2010, at 17:25, Blue Swirl wrote:
>>>
>>>> 'info tlb' didn't show correct information for PAE mode and
>>>> x86_64 long mode.
>>>>
>>>> Implement the missing modes. Also print NX bit for PAE and long modes.
>>>> Fix off-by-one error in 32 bit mode mask.
>>>>
>>>> Signed-off-by: Blue Swirl <address@hidden>
>>>> ---
>>>>
>>>> I didn't find an OS that enabled PAE, please test and report.
>>>
>>> Xen does. Just take a random recent xen kernel and run it with -kernel :).
>>
>> Thanks, it does (CR4 is 0xb0). I'm not sure all is correct, after
>> 0x1000000 the dump looks messy:
>> 0000000000c00000: 0000000000c00000 --PDA---W
>> 0000000000e00000: 0000000000e00000 --PDA---W
>> 0000000001000000: f000ff53f000f000 XG-D-C--W
>> 0000000001001000: f000ff53f000e000 X--D----W
>> 0000000001002000: f000ff53f000f000 XG-D-C--W
>> 0000000001003000: f000ff53f000f000 XG-D-C--W
>> 0000000001004000: f000e987f000f000 X---A--U-
>
> Good question XD. I guess the best way to find out if those numbers are right 
> would be to trace the page tables manually.

Those were actually caused by a bug of not checking the P bit for
intermediate tables, this was fixed in the second version.

> info tlb shows PA : VA, right?

No, VA : PA.