Commit 77cb2d91 authored by Marc Zyngier's avatar Marc Zyngier

arm64: KVM: VHE: Add fpsimd enabling on guest access

Despite the fact that a VHE enabled kernel runs at EL2, it uses
CPACR_EL1 to trap FPSIMD access. Add the required alternative
code to re-enable guest FPSIMD access when it has trapped to
EL2.
Reviewed-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 5efe6de1
...@@ -130,9 +130,15 @@ ENDPROC(__guest_exit) ...@@ -130,9 +130,15 @@ ENDPROC(__guest_exit)
ENTRY(__fpsimd_guest_restore) ENTRY(__fpsimd_guest_restore)
stp x4, lr, [sp, #-16]! stp x4, lr, [sp, #-16]!
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
mrs x2, cptr_el2 mrs x2, cptr_el2
bic x2, x2, #CPTR_EL2_TFP bic x2, x2, #CPTR_EL2_TFP
msr cptr_el2, x2 msr cptr_el2, x2
alternative_else
mrs x2, cpacr_el1
orr x2, x2, #CPACR_EL1_FPEN
msr cpacr_el1, x2
alternative_endif
isb isb
mrs x3, tpidr_el2 mrs x3, tpidr_el2
......
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