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authorLinus Torvalds <torvalds@linux-foundation.org>2022-08-01 19:37:00 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2022-08-01 19:37:00 +0200
commit0cec3f24a7cedc726f8790d693aaff2c535dc4ce (patch)
tree964e115cda27fd3f93b662a760fbc7d9a8e845e7 /Documentation/virt
parentMerge tag 'm68k-for-v5.20-tag1' of git://git.kernel.org/pub/scm/linux/kernel/... (diff)
parentarm64: Delay initialisation of cpuinfo_arm64::reg_{zcr,smcr} (diff)
downloadlinux-0cec3f24a7cedc726f8790d693aaff2c535dc4ce.tar.xz
linux-0cec3f24a7cedc726f8790d693aaff2c535dc4ce.zip
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 updates from Will Deacon: "Highlights include a major rework of our kPTI page-table rewriting code (which makes it both more maintainable and considerably faster in the cases where it is required) as well as significant changes to our early boot code to reduce the need for data cache maintenance and greatly simplify the KASLR relocation dance. Summary: - Remove unused generic cpuidle support (replaced by PSCI version) - Fix documentation describing the kernel virtual address space - Handling of some new CPU errata in Arm implementations - Rework of our exception table code in preparation for handling machine checks (i.e. RAS errors) more gracefully - Switch over to the generic implementation of ioremap() - Fix lockdep tracking in NMI context - Instrument our memory barrier macros for KCSAN - Rework of the kPTI G->nG page-table repainting so that the MMU remains enabled and the boot time is no longer slowed to a crawl for systems which require the late remapping - Enable support for direct swapping of 2MiB transparent huge-pages on systems without MTE - Fix handling of MTE tags with allocating new pages with HW KASAN - Expose the SMIDR register to userspace via sysfs - Continued rework of the stack unwinder, particularly improving the behaviour under KASAN - More repainting of our system register definitions to match the architectural terminology - Improvements to the layout of the vDSO objects - Support for allocating additional bits of HWCAP2 and exposing FEAT_EBF16 to userspace on CPUs that support it - Considerable rework and optimisation of our early boot code to reduce the need for cache maintenance and avoid jumping in and out of the kernel when handling relocation under KASLR - Support for disabling SVE and SME support on the kernel command-line - Support for the Hisilicon HNS3 PMU - Miscellanous cleanups, trivial updates and minor fixes" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (136 commits) arm64: Delay initialisation of cpuinfo_arm64::reg_{zcr,smcr} arm64: fix KASAN_INLINE arm64/hwcap: Support FEAT_EBF16 arm64/cpufeature: Store elf_hwcaps as a bitmap rather than unsigned long arm64/hwcap: Document allocation of upper bits of AT_HWCAP arm64: enable THP_SWAP for arm64 arm64/mm: use GENMASK_ULL for TTBR_BADDR_MASK_52 arm64: errata: Remove AES hwcap for COMPAT tasks arm64: numa: Don't check node against MAX_NUMNODES drivers/perf: arm_spe: Fix consistency of SYS_PMSCR_EL1.CX perf: RISC-V: Add of_node_put() when breaking out of for_each_of_cpu_node() docs: perf: Include hns3-pmu.rst in toctree to fix 'htmldocs' WARNING arm64: kasan: Revert "arm64: mte: reset the page tag in page->flags" mm: kasan: Skip page unpoisoning only if __GFP_SKIP_KASAN_UNPOISON mm: kasan: Skip unpoisoning of user pages mm: kasan: Ensure the tags are visible before the tag in page->flags drivers/perf: hisi: add driver for HNS3 PMU drivers/perf: hisi: Add description for HNS3 PMU driver drivers/perf: riscv_pmu_sbi: perf format perf/arm-cci: Use the bitmap API to allocate bitmaps ...
Diffstat (limited to 'Documentation/virt')
-rw-r--r--Documentation/virt/kvm/arm/hyp-abi.rst11
1 files changed, 6 insertions, 5 deletions
diff --git a/Documentation/virt/kvm/arm/hyp-abi.rst b/Documentation/virt/kvm/arm/hyp-abi.rst
index 4d43fbc25195..412b276449d3 100644
--- a/Documentation/virt/kvm/arm/hyp-abi.rst
+++ b/Documentation/virt/kvm/arm/hyp-abi.rst
@@ -60,12 +60,13 @@ these functions (see arch/arm{,64}/include/asm/virt.h):
* ::
- x0 = HVC_VHE_RESTART (arm64 only)
+ x0 = HVC_FINALISE_EL2 (arm64 only)
- Attempt to upgrade the kernel's exception level from EL1 to EL2 by enabling
- the VHE mode. This is conditioned by the CPU supporting VHE, the EL2 MMU
- being off, and VHE not being disabled by any other means (command line
- option, for example).
+ Finish configuring EL2 depending on the command-line options,
+ including an attempt to upgrade the kernel's exception level from
+ EL1 to EL2 by enabling the VHE mode. This is conditioned by the CPU
+ supporting VHE, the EL2 MMU being off, and VHE not being disabled by
+ any other means (command line option, for example).
Any other value of r0/x0 triggers a hypervisor-specific handling,
which is not documented here.