linux - Linux Kernel (branches are rebased on master from time to time)

Age	Commit message (Collapse)	Author	Files	Lines
2021-01-27	arm64: trans_pgd: hibernate: idmap the single page that holds the copy page ↵	James Morse	1	-0/+49
	routines To resume from hibernate, the contents of memory are restored from the swap image. This may overwrite any page, including the running kernel and its page tables. Hibernate copies the code it uses to do the restore into a single page that it knows won't be overwritten, and maps it with page tables built from pages that won't be overwritten. Today the address it uses for this mapping is arbitrary, but to allow kexec to reuse this code, it needs to be idmapped. To idmap the page we must avoid the kernel helpers that have VA_BITS baked in. Convert create_single_mapping() to take a single PA, and idmap it. The page tables are built in the reverse order to normal using pfn_pte() to stir in any bits between 52:48. T0SZ is always increased to cover 48bits, or 52 if the copy code has bits 52:48 in its PA. Signed-off-by: James Morse <james.morse@arm.com> [Adopted the original patch from James to trans_pgd interface, so it can be commonly used by both Kexec and Hibernate. Some minor clean-ups.] Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> Link: https://lore.kernel.org/linux-arm-kernel/20200115143322.214247-4-james.morse@arm.com/ Link: https://lore.kernel.org/r/20210125191923.1060122-9-pasha.tatashin@soleen.com Signed-off-by: Will Deacon <will@kernel.org>
2021-01-27	arm64: trans_pgd: pass NULL instead of init_mm to *_populate functions	Pavel Tatashin	1	-7/+7
	trans_pgd_* should be independent from mm context because the tables that are created by this code are used when there are no mm context around, as it is between kernels. Simply replace mm_init's with NULL. Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> Acked-by: James Morse <james.morse@arm.com> Link: https://lore.kernel.org/r/20210125191923.1060122-7-pasha.tatashin@soleen.com Signed-off-by: Will Deacon <will@kernel.org>
2021-01-27	arm64: trans_pgd: pass allocator trans_pgd_create_copy	Pavel Tatashin	1	-19/+30
	Make trans_pgd_create_copy and its subroutines to use allocator that is passed as an argument Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> Reviewed-by: James Morse <james.morse@arm.com> Link: https://lore.kernel.org/r/20210125191923.1060122-6-pasha.tatashin@soleen.com Signed-off-by: Will Deacon <will@kernel.org>
2021-01-27	arm64: trans_pgd: make trans_pgd_map_page generic	Pavel Tatashin	1	-8/+22
	kexec is going to use a different allocator, so make trans_pgd_map_page to accept allocator as an argument, and also kexec is going to use a different map protection, so also pass it via argument. Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> Reviewed-by: Matthias Brugger <mbrugger@suse.com> Link: https://lore.kernel.org/r/20210125191923.1060122-5-pasha.tatashin@soleen.com Signed-off-by: Will Deacon <will@kernel.org>
2021-01-27	arm64: hibernate: move page handling function to new trans_pgd.c	Pavel Tatashin	1	-0/+250
	Now, that we abstracted the required functions move them to a new home. Later, we will generalize these function in order to be useful outside of hibernation. Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> Reviewed-by: James Morse <james.morse@arm.com> Link: https://lore.kernel.org/r/20210125191923.1060122-4-pasha.tatashin@soleen.com Signed-off-by: Will Deacon <will@kernel.org>