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author | Dmytro Firsov <Dmytro_Firsov@epam.com> | 2022-07-19 14:55:28 +0000 |
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committer | Tom Rini <trini@konsulko.com> | 2022-07-25 14:57:27 -0400 |
commit | 0001a964b840a62c66da42a89a10a2656831aa4b (patch) | |
tree | 8ccc4c96dd038daca98608dd67e37c379eece8d7 /test/optee | |
parent | 032c9b045c6cf8f9acc38bd7867b6314614ebddc (diff) |
drivers: xen: unmap Enlighten page before jumping to Linux
This commit fixes issue with usage of Xen hypervisor shared info page.
Previously U-boot did not unmap it at the end of OS boot process. Xen
did not prevent guest from this. So, it worked, but caused wierd
issues - one memory page, that was returned by memalign in U-boot
for Enlighten mapping was not unmaped by Xen (shared_info values was
not removed from there) and returned to allocator. During the Linux
boot, it uses shared_info page as regular RAM page, which leads to
hypervisor shared info corruption.
So, to fix this issue, as discussed on the xen-devel mailing list, the
code should:
1) Unmap the page
2) Populate the area with memory using XENMEM_populate_physmap
This patch adds page unmapping via XENMEM_remove_from_physmap, fills
hole in address space where page was mapped via XENMEM_populate_physmap
and return this address to memory allocator for freeing.
Signed-off-by: Dmytro Firsov <dmytro_firsov@epam.com>
Reviewed-by: Anastasiia Lukianenko <vicooodin@gmail.com>
Diffstat (limited to 'test/optee')
0 files changed, 0 insertions, 0 deletions