KVM: arm64: nv: Handle CPACR_EL1 traps

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Handle CPACR_EL1 accesses when running a VHE guest. In order to
limit the cost of the emulation, implement it ass a shallow exit.

In the other cases:

- this is a nVHE L1 which will write to memory, and we don't trap

- this is a L2 guest:

  * the L1 has CPTR_EL2.TCPAC==0, and the L2 has direct register
   access

  * the L1 has CPTR_EL2.TCPAC==1, and the L2 will trap, but the
    handling is defered to the general handling for forwarding

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240620164653.1130714-10-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

...

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Marc Zyngier 2024-06-20 16:46:46 +00:00 • committed by Oliver Upton

parent 1785f020b1

commit 493da2b1c4

1 changed files with 31 additions and 1 deletions

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arch/arm64/kvm/hyp/vhe/switch.c

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