KVM: arm64: Extend masking facility to arbitrary registers

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We currently only use the masking (RES0/RES1) facility for VNCR
registers, as they are memory-based and thus easy to sanitise.

But we could apply the same thing to other registers if we:

- split the sanitisation from __VNCR_START__
- apply the sanitisation when reading from a HW register

This involves a new "marker" in the vcpu_sysreg enum, which
defines the point at which the sanitisation applies (the VNCR
registers being of course after this marker).

Whle we are at it, rename kvm_vcpu_sanitise_vncr_reg() to
kvm_vcpu_apply_reg_masks(), which is vaguely more explicit,
and harden set_sysreg_masks() against setting masks for
random registers...

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Link: https://lore.kernel.org/r/20241023145345.1613824-10-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

...

This commit is contained in:

Marc Zyngier 2024-10-23 15:53:17 +01:00 • committed by Oliver Upton

parent 14ca930d82

commit a016202009

3 changed files with 24 additions and 10 deletions

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19

arch/arm64/include/asm/kvm_host.h

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12

arch/arm64/kvm/nested.c

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3

arch/arm64/kvm/sys_regs.c

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