kernel.git/arch/arm64/include/asm/sysreg.h, branch linux-4.8.y

arm64: trap userspace "dc cvau" cache operation on errata-affected core

2016-07-01T10:46:00Z

The ARM errata 819472, 826319, 827319 and 824069 for affected Cortex-A53 cores demand to promote "dc cvau" instructions to "dc civac". Since we allow userspace to also emit those instructions, we should make sure that "dc cvau" gets promoted there too. So lets grasp the nettle here and actually trap every userland cache maintenance instruction once we detect at least one affected core in the system. We then emulate the instruction by executing it on behalf of userland, promoting "dc cvau" to "dc civac" on the way and injecting access fault back into userspace. Signed-off-by: Andre Przywara [catalin.marinas@arm.com: s/set_segfault/arm64_notify_segfault/] Signed-off-by: Catalin Marinas

arm64: Cleanup SCTLR flags

2016-04-28T11:05:46Z

We currently have macros defining flags for the arm64 sctlr registers in both kvm_arm.h and sysreg.h. To clean things up and simplify move the definitions of the SCTLR_EL2 flags from kvm_arm.h to sysreg.h, rename any SCTLR_EL1 or SCTLR_EL2 flags that are common to both registers to be SCTLR_ELx, with 'x' indicating a common flag, and fixup all files to include the proper header or to use the new macro names. Signed-off-by: Geoff Levand [Restored pgtable-hwdef.h include] Signed-off-by: James Morse Acked-by: Marc Zyngier Signed-off-by: Will Deacon

arm64: Add helpers for detecting AArch32 support at EL0

2016-04-20T11:22:42Z

Adds a helper to extract the support for AArch32 at EL0 Tested-by: Yury Norov Signed-off-by: Suzuki K Poulose Signed-off-by: Will Deacon

arm64: cpufeature: append additional id_aa64mmfr2 fields to cpufeature

2016-04-13T13:49:23Z

There are some new cpu features which can be identified by id_aa64mmfr2, this patch appends all fields of it. Signed-off-by: Kefeng Wang Signed-off-by: Will Deacon

arm64: kvm: 4.6-rc1: Fix VTCR_EL2 VS setting

2016-03-30T20:09:15Z

When we detect support for 16bit VMID in ID_AA64MMFR1, we set the VTCR_EL2_VS field to 1 to make use of 16bit vmids. But, with commit 3a3604bc5eb4 ("arm64: KVM: Switch to C-based stage2 init") this is broken and we corrupt VTCR_EL2:T0SZ instead of updating the VS field. VTCR_EL2_VS was actually defined to the field shift (19) and not the real value for VS. This patch fixes the issue. Fixes: commit 3a3604bc5eb4 ("arm64: KVM: Switch to C-based stage2 init") Cc: Christoffer Dall Cc: Mark Rutland Acked-by: Marc Zyngier Signed-off-by: Suzuki K Poulose Signed-off-by: Christoffer Dall

arm64: kernel: Add support for User Access Override

2016-02-18T17:27:04Z

'User Access Override' is a new ARMv8.2 feature which allows the unprivileged load and store instructions to be overridden to behave in the normal way. This patch converts {get,put}_user() and friends to use ldtr*/sttr* instructions - so that they can only access EL0 memory, then enables UAO when fs==KERNEL_DS so that these functions can access kernel memory. This allows user space's read/write permissions to be checked against the page tables, instead of testing addr [catalin.marinas@arm.com: move uao_thread_switch() above dsb()] Signed-off-by: Catalin Marinas

arm64: add ARMv8.2 id_aa64mmfr2 boiler plate

2016-02-18T12:00:01Z

ARMv8.2 adds a new feature register id_aa64mmfr2. This patch adds the cpu feature boiler plate used by the actual features in later patches. Signed-off-by: James Morse Reviewed-by: Suzuki K Poulose Signed-off-by: Catalin Marinas

arm64: use local label prefixes for __reg_num symbols

2016-02-16T18:39:58Z

The __reg_num_xNN symbols that are used to implement the msr_s and mrs_s macros are recorded in the ELF metadata of each object file. This does not affect the size of the final binary, but it does clutter the output of tools like readelf, i.e., $ readelf -a vmlinux |grep -c __reg_num_x 50976 So let's use symbols with the .L prefix, these are strictly local, and don't end up in the object files. $ readelf -a vmlinux |grep -c __reg_num_x 0 Acked-by: Will Deacon Signed-off-by: Ard Biesheuvel Signed-off-by: Catalin Marinas

arm64: Add macros to read/write system registers

2015-12-14T11:30:38Z

Rather than crafting custom macros for reading/writing each system register provide generics accessors, read_sysreg and write_sysreg, for this purpose. Signed-off-by: Mark Rutland Acked-by: Catalin Marinas Cc: Suzuki Poulose Cc: Will Deacon Signed-off-by: Marc Zyngier

arm64: Keep track of CPU feature registers

2015-10-21T14:35:37Z

This patch adds an infrastructure to keep track of the CPU feature registers on the system. For each register, the infrastructure keeps track of the system wide safe value of the feature bits. Also, tracks the which fields of a register should be matched strictly across all the CPUs on the system for the SANITY check infrastructure. The feature bits are classified into following 3 types depending on the implication of the possible values. This information is used to decide the safe value for a feature. LOWER_SAFE - The smaller value is safer HIGHER_SAFE - The bigger value is safer EXACT - We can't decide between the two, so a predefined safe_value is used. This infrastructure will be later used to make better decisions for: - Kernel features (e.g, KVM, Debug) - SANITY Check - CPU capability - ELF HWCAP - Exposing CPU Feature register to userspace. Signed-off-by: Suzuki K. Poulose Tested-by: Dave Martin [catalin.marinas@arm.com: whitespace fix] Signed-off-by: Catalin Marinas