[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH v3 00/18] xen/arm: Don't switch TTBR while the MMU is on
Hi, On 12/12/2022 09:55, Julien Grall wrote: From: Julien Grall <jgrall@xxxxxxxxxx> Hi all, Currently, Xen on Arm will switch TTBR whilst the MMU is on. This is similar to replacing existing mappings with new ones. So we need to follow a break-before-make sequence. When switching the TTBR, we need to temporary disable the MMU before updating the TTBR. This means the page-tables must contain an identity mapping. The current memory layout is not very flexible and has an higher chance to clash with the identity mapping. On Arm64, we have plenty of unused virtual address space Therefore, we can simply reshuffle the layout to leave the first part of the virtual address space empty. On Arm32, the virtual address space is already quite full. Even if we find space, it would be necessary to have a dynamic layout. So a different approach will be necessary. The chosen one is to have a temporary mapping that will be used to jumped from the ID mapping to the runtime mapping (or vice versa). The temporary mapping will be overlapping with the domheap area as it should not be used when switching on/off the MMU. The Arm32 part is not yet addressed and will be handled in a follow-up series. After this series, most of Xen page-table code should be compliant with the Arm Arm. The last two issues I am aware of are: - domheap: Mappings are replaced without using the Break-Before-Make approach. - The cache is not cleaned/invalidated when updating the page-tables with Data cache off (like during early boot). The long term plan is to get rid of boot_* page tables and then directly use the runtime pages. This means for coloring, we will need to build the pages in the relocated Xen rather than the current Xen. For convience, I pushed a branch with everything applied: https://xenbits.xen.org/git-http/people/julieng/xen-unstable.git branch boot-pt-rework-v3 Cheers, Julien Grall (18): xen/arm: Enable use of dump_pt_walk() early during boot [...] xen/arm: mm: Allow xen_pt_update() to work with the current root table xen/arm: mm: Allow dump_hyp_walk() to work on the current root table I have pushed those 3 patches because they are ready. Cheers, -- Julien Grall
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