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Marc Zyngier 0a216625c3 KVM: arm64: pkvm: Fixup boot mode to reflect that the kernel resumes from EL1

The kernel has an awfully complicated boot sequence in order to cope
with the various EL2 configurations, including those that "enhanced"
the architecture. We go from EL2 to EL1, then back to EL2, staying
at EL2 if VHE capable and otherwise go back to EL1.

Here's a paracetamol tablet for you.

The cpu_resume path follows the same logic, because coming up with
two versions of a square wheel is hard.

However, things aren't this straightforward with pKVM, as the host
resume path is always proxied by the hypervisor, which means that
the kernel is always entered at EL1. Which contradicts what the
__boot_cpu_mode[] array contains (it obviously says EL2).

This thus triggers a HVC call from EL1 to EL2 in a vain attempt
to upgrade from EL1 to EL2 VHE, which we are, funnily enough,
reluctant to grant to the host kernel. This is also completely
unexpected, and puzzles your average EL2 hacker.

Address it by fixing up the boot mode at the point the host gets
deprivileged. is_hyp_mode_available() and co already have a static
branch to deal with this, making it pretty safe.

This stable fix doesn't have an upstream version. The entire bootflow
has been reworked from 6.0 and that fixed the boot mode at the same
time, from commit 005e12676af0 ("arm64: head: record CPU boot mode after
enabling the MMU") to be precise. However, the latter is part of a 20
patches long series and can't be simply cherry-pick'ed.

Link: https://lore.kernel.org/r/20220624150651.1358849-1-ardb@kernel.org/
Link: https://lore.kernel.org/r/20221011165400.1241729-1-maz@kernel.org/
Cc: <stable@vger.kernel.org> # 5.15+
Reported-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vincent Donnefort <vdonnefort@google.com>
[Vincent: Add a paragraph about why this patch is for stable only]
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-12-02 17:41:08 +01:00

alpha

tty: the rest, stop using tty_schedule_flip()

2022-07-29 17:25:32 +02:00

arc

arc: iounmap() arg is volatile

2022-11-03 23:59:15 +09:00

arm

ARM: dts: imx6q-prti6q: Fix ref/tcxo-clock-frequency properties

2022-12-02 17:41:04 +01:00

arm64

KVM: arm64: pkvm: Fixup boot mode to reflect that the kernel resumes from EL1