arm64/kvm: use ESR_ELx_EC to extract EC

Now that we have a helper to extract the EC from an ESR_ELx value, make
use of this in the arm64 KVM code for simplicity and consistency. There
should be no functional changes as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Dave P Martin <dave.martin@arm.com>
Cc: Huang Shijie <shijie.huang@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/kvm_emulate.h

@@ -210,7 +210,7 @@ static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
 
 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
 {
-	return kvm_vcpu_get_hsr(vcpu) >> ESR_ELx_EC_SHIFT;
+	return ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
 }
 
 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)

arch/arm64/kvm/handle_exit.c

@@ -106,7 +106,7 @@ static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run)
 	run->exit_reason = KVM_EXIT_DEBUG;
 	run->debug.arch.hsr = hsr;
 
-	switch (hsr >> ESR_ELx_EC_SHIFT) {
+	switch (ESR_ELx_EC(hsr)) {
 	case ESR_ELx_EC_WATCHPT_LOW:
 		run->debug.arch.far = vcpu->arch.fault.far_el2;
 		/* fall through */
@@ -149,7 +149,7 @@ static exit_handle_fn arm_exit_handlers[] = {
 static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
 {
 	u32 hsr = kvm_vcpu_get_hsr(vcpu);
-	u8 hsr_ec = hsr >> ESR_ELx_EC_SHIFT;
+	u8 hsr_ec = ESR_ELx_EC(hsr);
 
 	if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
 	    !arm_exit_handlers[hsr_ec]) {

arch/arm64/kvm/hyp/switch.c

@@ -198,7 +198,7 @@ static bool __hyp_text __translate_far_to_hpfar(u64 far, u64 *hpfar)
 static bool __hyp_text __populate_fault_info(struct kvm_vcpu *vcpu)
 {
 	u64 esr = read_sysreg_el2(esr);
-	u8 ec = esr >> ESR_ELx_EC_SHIFT;
+	u8 ec = ESR_ELx_EC(esr);
 	u64 hpfar, far;
 
 	vcpu->arch.fault.esr_el2 = esr;