kernel.git/arch/x86/platform, branch linux-3.19.y

x86/efi: Avoid triple faults during EFI mixed mode calls

2015-03-06T22:57:42Z

commit 96738c69a7fcdbf0d7c9df0c8a27660011e82a7b upstream. Andy pointed out that if an NMI or MCE is received while we're in the middle of an EFI mixed mode call a triple fault will occur. This can happen, for example, when issuing an EFI mixed mode call while running perf. The reason for the triple fault is that we execute the mixed mode call in 32-bit mode with paging disabled but with 64-bit kernel IDT handlers installed throughout the call. At Andy's suggestion, stop playing the games we currently do at runtime, such as disabling paging and installing a 32-bit GDT for __KERNEL_CS. We can simply switch to the __KERNEL32_CS descriptor before invoking firmware services, and run in compatibility mode. This way, if an NMI/MCE does occur the kernel IDT handler will execute correctly, since it'll jump to __KERNEL_CS automatically. However, this change is only possible post-ExitBootServices(). Before then the firmware "owns" the machine and expects for its 32-bit IDT handlers to be left intact to service interrupts, etc. So, we now need to distinguish between early boot and runtime invocations of EFI services. During early boot, we need to restore the GDT that the firmware expects to be present. We can only jump to the __KERNEL32_CS code segment for mixed mode calls after ExitBootServices() has been invoked. A liberal sprinkling of comments in the thunking code should make the differences in early and late environments more apparent. Reported-by: Andy Lutomirski Tested-by: Borislav Petkov Signed-off-by: Matt Fleming Signed-off-by: Greg Kroah-Hartman

Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-12-19T22:02:02Z

Pull x86 apic updates from Thomas Gleixner: "After stopping the full x86/apic branch, I took some time to go through the first block of patches again, which are mostly cleanups and preparatory work for the irqdomain conversion and ioapic hotplug support. Unfortunaly one of the real problematic commits was right at the beginning, so I rebased this portion of the pending patches without the offenders. It would be great to get this into 3.19. That makes reworking the problematic parts simpler. The usual tip testing did not unearth any issues and it is fully bisectible now. I'm pretty confident that this wont affect the calmness of the xmas season. Changes: - Split the convoluted io_apic.c code into domain specific parts (vector, ioapic, msi, htirq) - Introduce proper helper functions to retrieve irq specific data instead of open coded dereferencing of pointers - Preparatory work for ioapic hotplug and irqdomain conversion - Removal of the non functional pci-ioapic driver - Removal of unused irq entry stubs - Make native_smp_prepare_cpus() preemtible to avoid GFP_ATOMIC allocations for everything which is called from there. - Small cleanups and fixes" * 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (36 commits) iommu/amd: Use helpers to access irq_cfg data structure associated with IRQ iommu/vt-d: Use helpers to access irq_cfg data structure associated with IRQ x86: irq_remapping: Use helpers to access irq_cfg data structure associated with IRQ x86, irq: Use helpers to access irq_cfg data structure associated with IRQ x86, irq: Make MSI and HT_IRQ indepenent of X86_IO_APIC x86, irq: Move IRQ initialization routines from io_apic.c into vector.c x86, irq: Move IOAPIC related declarations from hw_irq.h into io_apic.h x86, irq: Move HT IRQ related code from io_apic.c into htirq.c x86, irq: Move PCI MSI related code from io_apic.c into msi.c x86, irq: Replace printk(KERN_LVL) with pr_lvl() utilities x86, irq: Make UP version of irq_complete_move() an inline stub x86, irq: Move local APIC related code from io_apic.c into vector.c x86, irq: Introduce helpers to access struct irq_cfg x86, irq: Protect __clear_irq_vector() with vector_lock x86, irq: Rename local APIC related functions in io_apic.c as apic_xxx() x86, irq: Refine hw_irq.h to prepare for irqdomain support x86, irq: Convert irq_2_pin list to generic list x86, irq: Kill useless parameter 'irq_attr' of IO_APIC_get_PCI_irq_vector() x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI x86, irq: Introduce helper to check whether an IOAPIC has been registered ...

x86, irq: Use helpers to access irq_cfg data structure associated with IRQ

2014-12-16T13:08:17Z

Use helpers to access irq_cfg data structure associated with IRQ, instead of accessing irq_data->chip_data directly. Later we can rewrite those helpers to support hierarchy irqdomain. Signed-off-by: Jiang Liu Cc: Konrad Rzeszutek Wilk Cc: Tony Luck Cc: Joerg Roedel Cc: Greg Kroah-Hartman Cc: Benjamin Herrenschmidt Cc: Rafael J. Wysocki Cc: Bjorn Helgaas Cc: Randy Dunlap Cc: Yinghai Lu Cc: Borislav Petkov Cc: Grant Likely Cc: Prarit Bhargava Link: http://lkml.kernel.org/r/1414397531-28254-17-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner

x86, irq: Rename local APIC related functions in io_apic.c as apic_xxx()

2014-12-16T13:08:16Z

Rename local APIC related functions in io_apic.c as apic_xxx() instead of ioapic_xxx(), later they will be moved into separate file. Signed-off-by: Jiang Liu Cc: Konrad Rzeszutek Wilk Cc: Tony Luck Cc: Joerg Roedel Cc: Greg Kroah-Hartman Cc: Benjamin Herrenschmidt Cc: Rafael J. Wysocki Cc: Bjorn Helgaas Cc: Randy Dunlap Cc: Yinghai Lu Cc: Borislav Petkov Cc: Prarit Bhargava Cc: Grant Likely Link: http://lkml.kernel.org/r/1414397531-28254-7-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner

Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2014-12-15T00:10:09Z

Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev__once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...

Merge branches 'x86-platform-for-linus' and 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-12-10T21:40:11Z

Pull x86 platform changes from Ingo Molnar: "A handful of numachip APIC driver updates/fixes, and two small SGI/UV fixes" * 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86: numachip: APIC driver cleanups x86: numachip: Elide self-IPI ICR polling x86: numachip: Fix 16-bit APIC ID truncation * 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86: UV BAU: Increase maximum CPUs per socket/hub x86: UV BAU: Avoid NULL pointer reference in ptc_seq_show

Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-12-10T20:42:16Z

Pull EFI updates from Ingo Molnar: "Changes in this cycle are: - support module unload for efivarfs (Mathias Krause) - another attempt at moving x86 to libstub taking advantage of the __pure attribute (Ard Biesheuvel) - add EFI runtime services section to ptdump (Mathias Krause)" * 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, ptdump: Add section for EFI runtime services efi/x86: Move x86 back to libstub efivarfs: Allow unloading when build as module

Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-12-10T20:09:26Z

Pull x86 asm updates from Ingo Molnar: "Misc changes: - context switch micro-optimization - debug printout micro-optimization - comment enhancements and typo fix" * 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86: Replace seq_printf() with seq_puts() x86/asm: Fix typo in arch/x86/kernel/asm_offset_64.c sched/x86: Add a comment clarifying LDT context switching sched/x86_64: Don't save flags on context switch

x86: Replace seq_printf() with seq_puts()

2014-12-08T10:48:15Z

seq_puts is a lot cheaper than seq_printf, so use that to print literal strings. Signed-off-by: Rasmus Villemoes Link: http://lkml.kernel.org/r/1417208622-12264-1-git-send-email-linux@rasmusvillemoes.dk Signed-off-by: Ingo Molnar

Merge tag 'efi-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/efi

2014-11-16T09:48:53Z

Pull EFI updates for v3.19 from Matt Fleming: - Support module unload for efivarfs - Mathias Krause - Another attempt at moving x86 to libstub taking advantage of the __pure attribute - Ard Biesheuvel - Add EFI runtime services section to ptdump - Mathias Krause Signed-off-by: Ingo Molnar