Commit 96e5e670 authored by Marc Zyngier's avatar Marc Zyngier

ARM: KVM: Add VFP lazy save/restore handler

Similar to the arm64 version, add the code that deals with VFP traps,
re-enabling VFP, save/restoring the registers and resuming the guest.
Reviewed-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 89ef2b21
......@@ -66,5 +66,36 @@ ENTRY(__guest_exit)
bx lr
ENDPROC(__guest_exit)
/*
* If VFPv3 support is not available, then we will not switch the VFP
* registers; however cp10 and cp11 accesses will still trap and fallback
* to the regular coprocessor emulation code, which currently will
* inject an undefined exception to the guest.
*/
#ifdef CONFIG_VFPv3
ENTRY(__vfp_guest_restore)
push {r3, r4, lr}
@ NEON/VFP used. Turn on VFP access.
mrc p15, 4, r1, c1, c1, 2 @ HCPTR
bic r1, r1, #(HCPTR_TCP(10) | HCPTR_TCP(11))
mcr p15, 4, r1, c1, c1, 2 @ HCPTR
isb
@ Switch VFP/NEON hardware state to the guest's
mov r4, r0
ldr r0, [r0, #VCPU_HOST_CTXT]
add r0, r0, #CPU_CTXT_VFP
bl __vfp_save_state
add r0, r4, #(VCPU_GUEST_CTXT + CPU_CTXT_VFP)
bl __vfp_restore_state
pop {r3, r4, lr}
pop {r0, r1, r2}
clrex
eret
ENDPROC(__vfp_guest_restore)
#endif
.popsection
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