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commit 5d8d4af24460d079ecdb190254b14b528add1228 upstream.
The introduction of the SVE registers to userspace started with a
refactoring of the way we expose any register via the ONE_REG
interface.
Unfortunately, this change doesn't exactly behave as expected
if the number of registers is non-zero and consider everything
to be an error. The visible result is that QEMU barfs very early
when creating vcpus.
Make sure we only exit early in case there is an actual error, rather
than a positive number of registers...
Fixes: be25bbb392fa ("KVM: arm64: Factor out core register ID enumeration")
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Takahiro Itazuri <itazur@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
17992d52dd