linux-dev/Documentation/x86, branch master

Merge tag 'x86_microcode_for_v6.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-10-04T17:12:08Z

Pull x75 microcode loader updates from Borislav Petkov: - Get rid of a single ksize() usage - By popular demand, print the previous microcode revision an update was done over - Remove more code related to the now gone MICROCODE_OLD_INTERFACE - Document the problems stemming from microcode late loading * tag 'x86_microcode_for_v6.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/microcode/AMD: Track patch allocation size explicitly x86/microcode: Print previous version of microcode after reload x86/microcode: Remove ->request_microcode_user() x86/microcode: Document the whole late loading problem

docs: x86: replace do_IRQ int the entry_64.rst with common_interrupt()

2022-09-27T19:21:44Z

do_IRQ has been replaced by common_interrupt in commit fa5e5c409213 ("x86/entry: Use idtentry for interrupts"). Signed-off-by: Tuo Cao <91tuocao@gmail.com> Link: https://lore.kernel.org/r/20220915150155.9908-1-91tuocao@gmail.com Signed-off-by: Jonathan Corbet

x86/microcode: Document the whole late loading problem

2022-08-18T13:57:53Z

Commit d23d33ea0fcd ("x86/microcode: Taint and warn on late loading") started tainting the kernel after microcode late loading. There is some history behind why x86 microcode started doing the late loading stop_machine() rendezvous. Document the whole situation. No functional changes. [ bp: Fix typos, heavily massage. ] Signed-off-by: Ashok Raj Signed-off-by: Borislav Petkov Link: https://lore.kernel.org/r/20220813223825.3164861-2-ashok.raj@intel.com

Merge tag 'dma-mapping-5.20-2022-08-06' of git://git.infradead.org/users/hch/dma-mapping

2022-08-06T17:56:45Z

Pull dma-mapping updates from Christoph Hellwig: - convert arm32 to the common dma-direct code (Arnd Bergmann, Robin Murphy, Christoph Hellwig) - restructure the PCIe peer to peer mapping support (Logan Gunthorpe) - allow the IOMMU code to communicate an optional DMA mapping length and use that in scsi and libata (John Garry) - split the global swiotlb lock (Tianyu Lan) - various fixes and cleanup (Chao Gao, Dan Carpenter, Dongli Zhang, Lukas Bulwahn, Robin Murphy) * tag 'dma-mapping-5.20-2022-08-06' of git://git.infradead.org/users/hch/dma-mapping: (45 commits) swiotlb: fix passing local variable to debugfs_create_ulong() dma-mapping: reformat comment to suppress htmldoc warning PCI/P2PDMA: Remove pci_p2pdma_[un]map_sg() RDMA/rw: drop pci_p2pdma_[un]map_sg() RDMA/core: introduce ib_dma_pci_p2p_dma_supported() nvme-pci: convert to using dma_map_sgtable() nvme-pci: check DMA ops when indicating support for PCI P2PDMA iommu/dma: support PCI P2PDMA pages in dma-iommu map_sg iommu: Explicitly skip bus address marked segments in __iommu_map_sg() dma-mapping: add flags to dma_map_ops to indicate PCI P2PDMA support dma-direct: support PCI P2PDMA pages in dma-direct map_sg dma-mapping: allow EREMOTEIO return code for P2PDMA transfers PCI/P2PDMA: Introduce helpers for dma_map_sg implementations PCI/P2PDMA: Attempt to set map_type if it has not been set lib/scatterlist: add flag for indicating P2PDMA segments in an SGL swiotlb: clean up some coding style and minor issues dma-mapping: update comment after dmabounce removal scsi: sd: Add a comment about limiting max_sectors to shost optimal limit ata: libata-scsi: cap ata_device->max_sectors according to shost->max_sectors scsi: scsi_transport_sas: cap shost opt_sectors according to DMA optimal limit ...

Merge tag 'x86_sgx_for_v6.0-2022-08-03.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-08-05T17:47:40Z

Pull x86 SGX updates from Dave Hansen: "A set of x86/sgx changes focused on implementing the "SGX2" features, plus a minor cleanup: - SGX2 ISA support which makes enclave memory management much more dynamic. For instance, enclaves can now change enclave page permissions on the fly. - Removal of an unused structure member" * tag 'x86_sgx_for_v6.0-2022-08-03.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (32 commits) x86/sgx: Drop 'page_index' from sgx_backing selftests/sgx: Page removal stress test selftests/sgx: Test reclaiming of untouched page selftests/sgx: Test invalid access to removed enclave page selftests/sgx: Test faulty enclave behavior selftests/sgx: Test complete changing of page type flow selftests/sgx: Introduce TCS initialization enclave operation selftests/sgx: Introduce dynamic entry point selftests/sgx: Test two different SGX2 EAUG flows selftests/sgx: Add test for TCS page permission changes selftests/sgx: Add test for EPCM permission changes Documentation/x86: Introduce enclave runtime management section x86/sgx: Free up EPC pages directly to support large page ranges x86/sgx: Support complete page removal x86/sgx: Support modifying SGX page type x86/sgx: Tighten accessible memory range after enclave initialization x86/sgx: Support adding of pages to an initialized enclave x86/sgx: Support restricting of enclave page permissions x86/sgx: Support VA page allocation without reclaiming x86/sgx: Export sgx_encl_page_alloc() ...

Merge tag 'efi-efivars-removal-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

2022-08-03T21:41:36Z

Pull efivars sysfs interface removal from Ard Biesheuvel: "Remove the obsolete 'efivars' sysfs based interface to the EFI variable store, now that all users have moved to the efivarfs pseudo file system, which was created ~10 years ago to address some fundamental shortcomings in the sysfs based driver. Move the 'business logic' related to which EFI variables are important and may affect the boot flow from the efivars support layer into the efivarfs pseudo file system, so it is no longer exposed to other parts of the kernel" * tag 'efi-efivars-removal-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: efi: vars: Move efivar caching layer into efivarfs efi: vars: Switch to new wrapper layer efi: vars: Remove deprecated 'efivars' sysfs interface

objtool: update objtool.txt references

2022-07-07T19:10:00Z

Changeset a8e35fece49b ("objtool: Update documentation") renamed: tools/objtool/Documentation/stack-validation.txt to: tools/objtool/Documentation/objtool.txt. Update the cross-references accordingly. Fixes: a8e35fece49b ("objtool: Update documentation") Signed-off-by: Mauro Carvalho Chehab Link: https://lore.kernel.org/r/ec285ece6348a5be191aebe45f78d06b3319056b.1656234456.git.mchehab@kernel.org Signed-off-by: Jonathan Corbet

Documentation/x86: Introduce enclave runtime management section

2022-07-07T17:13:03Z

Enclave runtime management is introduced following the pattern of the section describing enclave building. Provide a brief summary of enclave runtime management, pointing to the functions implementing the ioctl()s that will contain details within their kernel-doc. Signed-off-by: Reinette Chatre Signed-off-by: Dave Hansen Reviewed-by: Jarkko Sakkinen Link: https://lkml.kernel.org/r/1da0b9a938b28e68e6870ebd5291490d680e700b.1652137848.git.reinette.chatre@intel.com

efi: vars: Remove deprecated 'efivars' sysfs interface

2022-06-24T18:40:19Z

Commit 5d9db883761a ("efi: Add support for a UEFI variable filesystem") dated Oct 5, 2012, introduced a new efivarfs pseudo-filesystem to replace the efivars sysfs interface that was used up to that point to expose EFI variables to user space. The main problem with the sysfs interface was that it only supported up to 1024 bytes of payload per file, whereas the underlying variables themselves are only bounded by a platform specific per-variable and global limit that is typically much higher than 1024 bytes. The deprecated sysfs interface is only enabled on x86 and Itanium, other EFI enabled architectures only support the efivarfs pseudo-filesystem. So let's finally rip off the band aid, and drop the old interface entirely. This will make it easier to refactor and clean up the underlying infrastructure that is shared between efivars, efivarfs and efi-pstore, and is long overdue for a makeover. Signed-off-by: Ard Biesheuvel

x86/swiotlb: fix param usage in boot-options.rst

2022-06-22T10:42:08Z

Fix the usage of swiotlb param in kernel doc. Signed-off-by: Dongli Zhang Signed-off-by: Christoph Hellwig