On 11/13/20 12:47 PM, Jan Beulich wrote: > On 13.11.2020 11:39, Oleksandr Andrushchenko wrote: >> On 11/13/20 12:29 PM, Jan Beulich wrote: >>> On 09.11.2020 13:50, Oleksandr Andrushchenko wrote: >>>> From: Oleksandr Andrushchenko <oleksandr_andrushche...@epam.com> >>>> >>>> Non-ECAM host bridges in hwdom go directly to PCI config space, >>>> not through vpci (they use their specific method for accessing PCI >>>> configuration, e.g. dedicated registers etc.). >>> And access to these dedicated registers can't be intercepted? >> It can. But then you have to fully emulate that bridge, e.g. >> >> "if we write A to regB and after that write C to regZ then it >> >> means we are accessing config space. If we write...." > Sounds pretty much like the I/O port based access mechanism on > x86, which also has some sort of "enable". Of course, I/O port > accesses are particularly easy to intercept and handle... Yes, it has somewhat similar idea > >> I mean this would need lots of code in Xen to achieve that > Possibly, but look at the amount of code we have in Xen on the > x86 side to handle MCFG writes by Dom0.
But MCFG is handled the same way for all x86 machines, right? And here I'll have to have a SoC specific code, e.g. a specific driver > > Jan Thank you, Oleksandr
