On Mon, Jul 13, 2020 at 06:00:59PM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 66b7e05dc0239c5817859f261098ba9cc2efbd2b Mon Sep 17 00:00:00 2001
From: Steven Price <steven.price@xxxxxxx>
Date: Wed, 17 Jun 2020 11:54:56 +0100
Subject: [PATCH] KVM: arm64: Fix kvm_reset_vcpu() return code being incorrect
with SVE
If SVE is enabled then 'ret' can be assigned the return value of
kvm_vcpu_enable_sve() which may be 0 causing future "goto out" sites to
erroneously return 0 on failure rather than -EINVAL as expected.
Remove the initialisation of 'ret' and make setting the return value
explicit to avoid this situation in the future.
Fixes: 9a3cdf26e336 ("KVM: arm64/sve: Allow userspace to enable SVE for vcpus")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: James Morse <james.morse@xxxxxxx>
Signed-off-by: Steven Price <steven.price@xxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200617105456.28245-1-steven.price@xxxxxxx
I've worked around not having 540f76d12c66 ("arm64: cpufeature: Add CPU
capability for AArch32 EL1 support") in 5.7 and 5.4 and queued this
patch.
--
Thanks,
Sasha
