kernel/arch/x86/include/asm/set_memory.h, branch linux-5.14.y

x86: Fix various typos in comments, take #2

2021-03-21T22:50:28Z

Fix another ~42 single-word typos in arch/x86/ code comments, missed a few in the first pass, in particular in .S files. Signed-off-by: Ingo Molnar Cc: Borislav Petkov Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Paolo Bonzini Cc: Bjorn Helgaas Cc: linux-kernel@vger.kernel.org

x86: Fix various typos in comments

2021-03-18T14:31:53Z

Fix ~144 single-word typos in arch/x86/ code comments. Doing this in a single commit should reduce the churn. Signed-off-by: Ingo Molnar Cc: Borislav Petkov Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Paolo Bonzini Cc: Bjorn Helgaas Cc: linux-kernel@vger.kernel.org

arch, mm: make kernel_page_present() always available

2020-12-15T20:13:43Z

For architectures that enable ARCH_HAS_SET_MEMORY having the ability to verify that a page is mapped in the kernel direct map can be useful regardless of hibernation. Add RISC-V implementation of kernel_page_present(), update its forward declarations and stubs to be a part of set_memory API and remove ugly ifdefery in inlcude/linux/mm.h around current declarations of kernel_page_present(). Link: https://lkml.kernel.org/r/20201109192128.960-5-rppt@kernel.org Signed-off-by: Mike Rapoport Acked-by: Kirill A. Shutemov Cc: Albert Ou Cc: Andy Lutomirski Cc: Benjamin Herrenschmidt Cc: Borislav Petkov Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Christoph Lameter Cc: Dave Hansen Cc: David Hildenbrand Cc: David Rientjes Cc: "David S. Miller" Cc: "Edgecombe, Rick P" Cc: Heiko Carstens Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Joonsoo Kim Cc: Len Brown Cc: Michael Ellerman Cc: Palmer Dabbelt Cc: Paul Mackerras Cc: Paul Walmsley Cc: Pavel Machek Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: "Rafael J. Wysocki" Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

x86/{mce,mm}: Unmap the entire page if the whole page is affected and poisoned

2020-06-11T13:19:17Z

An interesting thing happened when a guest Linux instance took a machine check. The VMM unmapped the bad page from guest physical space and passed the machine check to the guest. Linux took all the normal actions to offline the page from the process that was using it. But then guest Linux crashed because it said there was a second machine check inside the kernel with this stack trace: do_memory_failure set_mce_nospec set_memory_uc _set_memory_uc change_page_attr_set_clr cpa_flush clflush_cache_range_opt This was odd, because a CLFLUSH instruction shouldn't raise a machine check (it isn't consuming the data). Further investigation showed that the VMM had passed in another machine check because is appeared that the guest was accessing the bad page. Fix is to check the scope of the poison by checking the MCi_MISC register. If the entire page is affected, then unmap the page. If only part of the page is affected, then mark the page as uncacheable. This assumes that VMMs will do the logical thing and pass in the "whole page scope" via the MCi_MISC register (since they unmapped the entire page). [ bp: Adjust to x86/entry changes. ] Fixes: 284ce4011ba6 ("x86/memory_failure: Introduce {set, clear}_mce_nospec()") Reported-by: Jue Wang Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov Signed-off-by: Thomas Gleixner Tested-by: Jue Wang Cc: Link: https://lkml.kernel.org/r/20200520163546.GA7977@agluck-desk2.amr.corp.intel.com

x86/mm: introduce __set_memory_prot()

2020-04-10T22:36:21Z

For use in the 32bit arch_add_memory() to set the pgprot type of the memory to add. Signed-off-by: Logan Gunthorpe Signed-off-by: Andrew Morton Reviewed-by: Dan Williams Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Dave Hansen Cc: Andy Lutomirski Cc: Peter Zijlstra Cc: Benjamin Herrenschmidt Cc: Catalin Marinas Cc: Christoph Hellwig Cc: David Hildenbrand Cc: Eric Badger Cc: Jason Gunthorpe Cc: Michael Ellerman Cc: Michal Hocko Cc: Paul Mackerras Cc: Will Deacon Link: http://lkml.kernel.org/r/20200306170846.9333-5-logang@deltatee.com Signed-off-by: Linus Torvalds

x86/mm/set_memory: Fix -Wmissing-prototypes warnings

2020-03-27T10:26:06Z

Add missing includes and move prototypes into the header set_memory.h in order to fix -Wmissing-prototypes warnings. [ bp: Add ifdeffery around arch_invalidate_pmem() ] Signed-off-by: Benjamin Thiel Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/20200320145028.6013-1-b.thiel@posteo.de

x86/mm: Remove set_kernel_text_r[ow]()

2019-11-27T06:44:24Z

With the last and only user of these functions gone (ftrace) remove them as well to avoid ever growing new users. Tested-by: Alexei Starovoitov Tested-by: Steven Rostedt (VMware) Signed-off-by: Peter Zijlstra (Intel) Acked-by: Alexei Starovoitov Cc: Andy Lutomirski Cc: Borislav Petkov Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Thomas Gleixner Link: https://lkml.kernel.org/r/20191111132457.819095320@infradead.org Signed-off-by: Ingo Molnar

x86/mm: Remove the unused set_memory_wt() function

2019-09-03T07:26:37Z

Signed-off-by: Christoph Hellwig Signed-off-by: Peter Zijlstra (Intel) Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner Link: https://lkml.kernel.org/r/20190826075558.8125-5-hch@lst.de Signed-off-by: Ingo Molnar

x86/mm: Remove set_pages_x() and set_pages_nx()

2019-09-03T07:26:37Z

These wrappers don't provide a real benefit over just using set_memory_x() and set_memory_nx(). Signed-off-by: Christoph Hellwig Signed-off-by: Peter Zijlstra (Intel) Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner Link: https://lkml.kernel.org/r/20190826075558.8125-4-hch@lst.de Signed-off-by: Ingo Molnar

x86/mm: Remove the unused set_memory_array_*() functions

2019-09-03T07:26:37Z