blackbird-op-linux/Documentation/powerpc, branch master

Merge tag 'powerpc-5.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2020-02-04T13:06:46+00:00

Pull powerpc updates from Michael Ellerman: "A pretty small batch for us, and apologies for it being a bit late, I wanted to sneak Christophe's user_access_begin() series in. Summary: - Implement user_access_begin() and friends for our platforms that support controlling kernel access to userspace. - Enable CONFIG_VMAP_STACK on 32-bit Book3S and 8xx. - Some tweaks to our pseries IOMMU code to allow SVMs ("secure" virtual machines) to use the IOMMU. - Add support for CLOCK_{REALTIME/MONOTONIC}_COARSE to the 32-bit VDSO, and some other improvements. - A series to use the PCI hotplug framework to control opencapi card's so that they can be reset and re-read after flashing a new FPGA image. As well as other minor fixes and improvements as usual. Thanks to: Alastair D'Silva, Alexandre Ghiti, Alexey Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V, Anju T Sudhakar, Bai Yingjie, Chen Zhou, Christophe Leroy, Frederic Barrat, Greg Kurz, Jason A. Donenfeld, Joel Stanley, Jordan Niethe, Julia Lawall, Krzysztof Kozlowski, Laurent Dufour, Laurentiu Tudor, Linus Walleij, Michael Bringmann, Nathan Chancellor, Nicholas Piggin, Nick Desaulniers, Oliver O'Halloran, Peter Ujfalusi, Pingfan Liu, Ram Pai, Randy Dunlap, Russell Currey, Sam Bobroff, Sebastian Andrzej Siewior, Shawn Anastasio, Stephen Rothwell, Steve Best, Sukadev Bhattiprolu, Thiago Jung Bauermann, Tyrel Datwyler, Vaibhav Jain" * tag 'powerpc-5.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (131 commits) powerpc: configs: Cleanup old Kconfig options powerpc/configs/skiroot: Enable some more hardening options powerpc/configs/skiroot: Disable xmon default & enable reboot on panic powerpc/configs/skiroot: Enable security features powerpc/configs/skiroot: Update for symbol movement only powerpc/configs/skiroot: Drop default n CONFIG_CRYPTO_ECHAINIV powerpc/configs/skiroot: Drop HID_LOGITECH powerpc/configs: Drop NET_VENDOR_HP which moved to staging powerpc/configs: NET_CADENCE became NET_VENDOR_CADENCE powerpc/configs: Drop CONFIG_QLGE which moved to staging powerpc: Do not consider weak unresolved symbol relocations as bad powerpc/32s: Fix kasan_early_hash_table() for CONFIG_VMAP_STACK powerpc: indent to improve Kconfig readability powerpc: Provide initial documentation for PAPR hcalls powerpc: Implement user_access_save() and user_access_restore() powerpc: Implement user_access_begin and friends powerpc/32s: Prepare prevent_user_access() for user_access_end() powerpc/32s: Drop NULL addr verification powerpc/kuap: Fix set direction in allow/prevent_user_access() powerpc/32s: Fix bad_kuap_fault() ...

powerpc: Provide initial documentation for PAPR hcalls

2020-01-29T10:30:50+00:00

This doc patch provides an initial description of the hcall op-codes that are used by Linux kernel running as a guest (LPAR) on top of PowerVM or any other sPAPR compliant hyper-visor (e.g qemu). Apart from documenting the hcalls the doc-patch also provides a rudimentary overview of how hcall ABI, how they are issued with the Linux kernel and how information/control flows between the guest and hypervisor. Signed-off-by: Vaibhav Jain Reviewed-by: Laurent Dufour Acked-by: Nicholas Piggin [mpe: Add SPDX tag, add it to index.rst] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190828082729.16695-1-vaibhav@linux.ibm.com

KVM: PPC: Book3S HV: Implement H_SVM_INIT_ABORT hcall

2020-01-17T04:08:31+00:00

Implement the H_SVM_INIT_ABORT hcall which the Ultravisor can use to abort an SVM after it has issued the H_SVM_INIT_START and before the H_SVM_INIT_DONE hcalls. This hcall could be used when Ultravisor encounters security violations or other errors when starting an SVM. Note that this hcall is different from UV_SVM_TERMINATE ucall which is used by HV to terminate/cleanup an VM that has becore secure. The H_SVM_INIT_ABORT basically undoes operations that were done since the H_SVM_INIT_START hcall - i.e page-out all the VM pages back to normal memory, and terminate the SVM. (If we do not bring the pages back to normal memory, the text/data of the VM would be stuck in secure memory and since the SVM did not go secure, its MSR_S bit will be clear and the VM wont be able to access its pages even to do a clean exit). Based on patches and discussion with Paul Mackerras, Ram Pai and Bharata Rao. Signed-off-by: Ram Pai Signed-off-by: Sukadev Bhattiprolu Signed-off-by: Bharata B Rao Signed-off-by: Paul Mackerras

powerpc/imc: Add documentation for IMC and trace-mode

2020-01-06T05:25:27+00:00

Documentation for IMC (In-Memory Collection Counters) infrastructure and trace-mode of IMC. Signed-off-by: Anju T Sudhakar [mpe: Convert to rst, minor rewording, make PMI example more concise] Signed-off-by: Michael Ellerman Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20191028100816.6270-1-mpe@ellerman.id.au

powerpc/fsl_booke/32: Document KASLR implementation

2019-11-13T08:27:58+00:00

Add document to explain how we implement KASLR for fsl_booke32. Signed-off-by: Jason Yan Signed-off-by: Scott Wood [mpe: Add it to the index as well] Signed-off-by: Michael Ellerman

docs: powerpc: Add missing documentation reference

2019-09-17T13:59:34+00:00

The documentation pages for 'elfnote' and 'ultravisor' are not included in the powerpc documentation index, this generates Sphinx warnings: WARNING: document isn't included in any toctree Additionally, when one includes these missing doc pages, more Sphinx warnings appear. Unused footnote references, syntax highlighting and table of content ordering has been adjusted. Signed-off-by: Adam Zerella Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190915052905.13431-1-adam.zerella@gmail.com

powerpc/fadump: update documentation about option to release opalcore

2019-09-13T14:04:45+00:00

With /sys/firmware/opal/core support available on OPAL based machines and an option to the release memory used by kernel in exporting this core file, update FADump documentation with these details. Signed-off-by: Hari Bathini Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/156821382786.5656.13173494907671241231.stgit@hbathini.in.ibm.com

powerpc/fadump: update documentation about CONFIG_PRESERVE_FA_DUMP

2019-09-13T14:04:45+00:00

Kernel config option CONFIG_PRESERVE_FA_DUMP is introduced to ensure crash data, from previously crash'ed kernel, is preserved. Update documentation with this details. Signed-off-by: Hari Bathini Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/156821377195.5656.15840065629705958324.stgit@hbathini.in.ibm.com

powerpc/fadump: Update documentation about OPAL platform support

2019-09-13T14:04:44+00:00

With FADump support now available on both pseries and OPAL platforms, update FADump documentation with these details. Signed-off-by: Hari Bathini Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/156821361692.5656.11377757995827253404.stgit@hbathini.in.ibm.com

powerpc/fadump: use FADump instead of fadump for how it is pronounced

2019-09-13T14:04:42+00:00

fadump is pronounced f-a-dump. Update documentation accordingly. Also, update how fadump_region contents look like with recent changes. Signed-off-by: Hari Bathini Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/156821339317.5656.15852294223821732082.stgit@hbathini.in.ibm.com