Borislav Petkov 579d8f085b x86/efi: Make efi virtual runtime map passing more robust ... commit b7b898ae0c upstream. Currently, running SetVirtualAddressMap() and passing the physical address of the virtual map array was working only by a lucky coincidence because the memory was present in the EFI page table too. Until Toshi went and booted this on a big HP box - the krealloc() manner of resizing the memmap we're doing did allocate from such physical addresses which were not mapped anymore and boom: http://lkml.kernel.org/r/1386806463.1791.295.camel@misato.fc.hp.com One way to take care of that issue is to reimplement the krealloc thing but with pages. We start with contiguous pages of order 1, i.e. 2 pages, and when we deplete that memory (shouldn't happen all that often but you know firmware) we realloc the next power-of-two pages. Having the pages, it is much more handy and easy to map them into the EFI page table with the already existing mapping code which we're using for building the virtual mappings. Thanks to Toshi Kani and Matt for the great debugging help. Reported-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Borislav Petkov <bp@suse.de> Tested-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-04-14 06:50:02 -07:00
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Makefile	x86/efi: Add EFI framebuffer earlyprintk support	2013-10-28 18:09:58 +00:00
early_printk.c	x86/efi: Fix earlyprintk off-by-one bug	2013-11-28 20:16:56 +00:00
efi-bgrt.c	x86/efi: Check status field to validate BGRT header	2014-02-14 10:07:15 +00:00
efi.c	x86/efi: Make efi virtual runtime map passing more robust	2014-04-14 06:50:02 -07:00
efi_32.c	x86/efi: Make efi virtual runtime map passing more robust	2014-04-14 06:50:02 -07:00
efi_64.c	x86/efi: Make efi virtual runtime map passing more robust	2014-04-14 06:50:02 -07:00
efi_stub_32.S	…
efi_stub_64.S	x86/efi: Runtime services virtual mapping	2013-11-02 11:09:36 +00:00