KVM: arm64: Plumb cp10 ID traps through the AArch64 sysreg handler

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In order to enable HCR_EL2.TID3 for AArch32 guests KVM needs to handle
traps where ESR_EL2.EC=0x8, which corresponds to an attempted VMRS
access from an ID group register. Specifically, the MVFR{0-2} registers
are accessed this way from AArch32. Conveniently, these registers are
architecturally mapped to MVFR{0-2}_EL1 in AArch64. Furthermore, KVM
already handles reads to these aliases in AArch64.

Plumb VMRS read traps through to the general AArch64 system register
handler.

Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220503060205.2823727-5-oupton@google.com

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Oliver Upton 2022-05-03 06:02:02 +00:00 • committed by Marc Zyngier

parent e651976667

commit 9369bc5c5e

3 changed files with 73 additions and 0 deletions

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1

arch/arm64/include/asm/kvm_host.h

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arch/arm64/kvm/handle_exit.c

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71

arch/arm64/kvm/sys_regs.c

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