Hi,
On 19/06/2020 13:51, Oleksandr Andrushchenko wrote:
On 6/19/20 3:47 PM, Julien Grall wrote:
They will not be available from the fdt, but you can retrieve them with an
hypervisor call (see HVM_PARAM_STORE_PFN, HVM_PARAM_CONSOLE_PFN).
Yes, and it used in the relevant pieces of code (hyp calls)
One question though, why do you need to map them in advance? Couldn't you map
them on demand?
Well, we need to at least estimate the pg_table size so we can reserve and
allocate memory later,
Oh, so U-boot doesn't support runtime page-table table allocation. Is
that right?
so I have to provide memory range from either by coding a constant or looking
into the devtree at
hypervisor { reg = <>; }. It is a bit tricky though
Looking for a node in the device-tree shouldn't be too difficult given
that you have fdt_* available.
However, please not that <reg> doesn't refer to the guest magic pages.
Instead, it provides a region you can use for mapping the grant-table frames
Cheers,
--
Julien Grall
