arm: KVM: keep arm vfp/simd exit handling consistent with arm64

After enhancing arm64 FP/SIMD exit handling, ARMv7 VFP exit branch is moved
to guest trap handling. This allows us to keep exit handling flow between both
architectures consistent.

Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/arch/arm/kvm/interrupts.S b/arch/arm/kvm/interrupts.S
index 568494dbbbb5b169581b656ed5126a0164b5a621..900ef6dd8f727e9a510b79cd0d9e36dbafa26cfa 100644 (file)
--- a/arch/arm/kvm/interrupts.S
+++ b/arch/arm/kvm/interrupts.S
@@ -361,10 +361,6 @@ hyp_hvc:
        @ Check syndrome register
        mrc     p15, 4, r1, c5, c2, 0   @ HSR
        lsr     r0, r1, #HSR_EC_SHIFT
-#ifdef CONFIG_VFPv3
-       cmp     r0, #HSR_EC_CP_0_13
-       beq     switch_to_guest_vfp
-#endif
        cmp     r0, #HSR_EC_HVC
        bne     guest_trap              @ Not HVC instr.
 
@@ -378,7 +374,10 @@ hyp_hvc:
        cmp     r2, #0
        bne     guest_trap              @ Guest called HVC
 
-host_switch_to_hyp:
+       /*
+        * Getting here means host called HVC, we shift parameters and branch
+        * to Hyp function.
+        */
        pop     {r0, r1, r2}
 
        /* Check for __hyp_get_vectors */
@@ -409,6 +408,10 @@ guest_trap:
 
        @ Check if we need the fault information
        lsr     r1, r1, #HSR_EC_SHIFT
+#ifdef CONFIG_VFPv3
+       cmp     r1, #HSR_EC_CP_0_13
+       beq     switch_to_guest_vfp
+#endif
        cmp     r1, #HSR_EC_IABT
        mrceq   p15, 4, r2, c6, c0, 2   @ HIFAR
        beq     2f
@@ -477,7 +480,6 @@ guest_trap:
  */
 #ifdef CONFIG_VFPv3
 switch_to_guest_vfp:
-       load_vcpu                       @ Load VCPU pointer to r0
        push    {r3-r7}
 
        @ NEON/VFP used.  Turn on VFP access.