On Tue, Jul 19, 2022 at 02:55:28PM +0000, Dmytro Firsov wrote: > 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_fir...@epam.com> > Reviewed-by: Anastasiia Lukianenko <vicooo...@gmail.com>
Applied to u-boot/master, thanks! -- Tom
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