KVM: arm64: Only reset vCPU-scoped feature ID regs once

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The general expecation with feature ID registers is that they're 'reset'
exactly once by KVM for the lifetime of a vCPU/VM, such that any
userspace changes to the CPU features / identity are honored after a
vCPU gets reset (e.g. PSCI_ON).

KVM handles what it calls VM-scoped feature ID registers correctly, but
feature ID registers local to a vCPU (CLIDR_EL1, MPIDR_EL1) get wiped
after every reset. What's especially concerning is that a
potentially-changing MPIDR_EL1 breaks MPIDR compression for indexing
mpidr_data, as the mask of useful bits to build the index could change.

This is absolutely no good. Avoid resetting vCPU feature ID registers
more than once.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240502233529.1958459-4-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Oliver Upton 2024-05-02 23:35:25 +00:00 • committed by Marc Zyngier

parent 44cbe80b76

commit e016333745

3 changed files with 26 additions and 13 deletions

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2

arch/arm64/include/asm/kvm_host.h

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5

arch/arm64/kvm/arm.c

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32

arch/arm64/kvm/sys_regs.c

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