* Question about TLBs
@ 2022-12-31 9:39 Nada Lachtar
2022-12-31 20:04 ` Alex Bennée
0 siblings, 1 reply; 2+ messages in thread
From: Nada Lachtar @ 2022-12-31 9:39 UTC (permalink / raw)
To: qemu-devel
[-- Attachment #1: Type: text/plain, Size: 244 bytes --]
Hello,
Does Qemu maintain two TLB for the x86_64 system (i.e iTLB and dTLB)? If yes, can you please point me to how to access the dTLB and what data structure maintains this information!
I would appreciate any help,
Thanks,
[-- Attachment #2: smime.p7s --]
[-- Type: application/pkcs7-signature, Size: 1379 bytes --]
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Question about TLBs
2022-12-31 9:39 Question about TLBs Nada Lachtar
@ 2022-12-31 20:04 ` Alex Bennée
0 siblings, 0 replies; 2+ messages in thread
From: Alex Bennée @ 2022-12-31 20:04 UTC (permalink / raw)
To: Nada Lachtar; +Cc: qemu-devel, Richard Henderson
Nada Lachtar <nlachtar@umich.edu> writes:
> [[S/MIME Signed Part:Undecided]]
> Hello,
>
> Does Qemu maintain two TLB for the x86_64 system (i.e iTLB and dTLB)?
> If yes, can you please point me to how to access the dTLB and what
> data structure maintains this information!
Qemu's internal softmmu TLB is unified and holds information for code
loads, memory accesses and re-directions for io access. See CPUTLBEntry
and CPUTLBEntryFull. They do not directly map onto any target specific
structures (although targets can use TARGET_PAGE_ENTRY_EXTRA to store
extra information in the table).
These entries are filled by target specific code via
cpu->cc->tcg_ops->tlb_fill() which in the x86 case takes you to
x86_cpu_tlb_fill(). This is the code responsible to walking the target
page tables and filling in the details of the mappings.
>
> I would appreciate any help,
>
>
> Thanks,
>
>
>
>
> [[End of S/MIME Signed Part]]
--
Alex Bennée
Virtualisation Tech Lead @ Linaro
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-12-31 20:10 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-12-31 9:39 Question about TLBs Nada Lachtar
2022-12-31 20:04 ` Alex Bennée
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.