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James Morse 8c2d146ee7 KVM: arm64: Define our own swab32() to avoid a uapi static inline
KVM uses swab32() when mediating GIC MMIO accesses if the GICV is badly
aligned, and the host and guest differ in endianness.

arm64 doesn't provide a __arch_swab32(), so __fswab32() is always backed
by the macro implementation that the compiler reduces to a single
instruction. But the static-inline causes problems for KVM if the compiler
chooses not to inline this function, it may not be located in the
__hyp_text where __vgic_v2_perform_cpuif_access() needs it.

Create our own __kvm_swab32() macro that calls ___constant_swab32()
directly. This way we know it will always be inlined.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200220165839.256881-3-james.morse@arm.com
2020-02-22 11:01:47 +00:00
arch KVM: arm64: Define our own swab32() to avoid a uapi static inline 2020-02-22 11:01:47 +00:00
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Documentation arm64: KVM: Add UAPI notes for swapped registers 2020-01-23 10:38:14 +00:00
drivers SCSI fixes on 20191227 2019-12-27 17:28:41 -08:00
fs File locking fix for v5.5 2019-12-29 09:50:57 -08:00
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virt kvm: arm/arm64: Fold VHE entry/exit work into kvm_vcpu_run_vhe() 2020-02-17 14:38:37 +00:00
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Makefile Linux 5.5-rc4 2019-12-29 15:29:16 -08:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.