KVM: arm64: fix misleading comments in save/restore

The elr_el2 and spsr_el2 registers in fact contain the processor state
before entry into EL2. In the case of guest state it could be in either
el0 or el1.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S
index 5befd01..519805f 100644 (file)
--- a/arch/arm64/kvm/hyp.S
+++ b/arch/arm64/kvm/hyp.S
@@ -50,8 +50,8 @@
        stp     x29, lr, [x3, #80]
 
        mrs     x19, sp_el0
-       mrs     x20, elr_el2            // EL1 PC
-       mrs     x21, spsr_el2           // EL1 pstate
+       mrs     x20, elr_el2            // pc before entering el2
+       mrs     x21, spsr_el2           // pstate before entering el2
 
        stp     x19, x20, [x3, #96]
        str     x21, [x3, #112]
@@ -82,8 +82,8 @@
        ldr     x21, [x3, #16]
 
        msr     sp_el0, x19
-       msr     elr_el2, x20                            // EL1 PC
-       msr     spsr_el2, x21                           // EL1 pstate
+       msr     elr_el2, x20            // pc on return from el2
+       msr     spsr_el2, x21           // pstate on return from el2
 
        add     x3, x2, #CPU_XREG_OFFSET(19)
        ldp     x19, x20, [x3]