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Commit 50f5bd57 authored by Christoffer Dall's avatar Christoffer Dall
Browse files

KVM: arm/arm64: Extract GICv3 max APRn index calculation 



As we are about to access the APRs from the GICv2 uaccess interface,
make this logic generally available.

Reviewed-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <cdall@linaro.org>
parent 7c7d2fa1

arch/arm64/kvm/vgic-sys-reg-v3.c

+3 −20
Original line number Diff line number Diff line
@@ -208,29 +208,12 @@ static void vgic_v3_access_apr_reg(struct kvm_vcpu *vcpu, 
static bool access_gic_aprn(struct kvm_vcpu *vcpu, struct sys_reg_params *p,

			    const struct sys_reg_desc *r, u8 apr)

{

	struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;

	u8 idx = r->Op2 & 3;



	/*

	 * num_pri_bits are initialized with HW supported values.

	 * We can rely safely on num_pri_bits even if VM has not

	 * restored ICC_CTLR_EL1 before restoring APnR registers.

	 */

	switch (vgic_v3_cpu->num_pri_bits) {

	case 7:

		vgic_v3_access_apr_reg(vcpu, p, apr, idx);

		break;

	case 6:

		if (idx > 1)

	if (idx > vgic_v3_max_apr_idx(vcpu))

		goto err;

		vgic_v3_access_apr_reg(vcpu, p, apr, idx);

		break;

	default:

		if (idx > 0)

			goto err;

		vgic_v3_access_apr_reg(vcpu, p, apr, idx);

	}



	vgic_v3_access_apr_reg(vcpu, p, apr, idx);

	return true;

err:

	if (!p->is_write)

virt/kvm/arm/vgic/vgic.h

+16 −0
Original line number Diff line number Diff line
@@ -220,4 +220,20 @@ int vgic_debug_destroy(struct kvm *kvm); 
bool lock_all_vcpus(struct kvm *kvm);

void unlock_all_vcpus(struct kvm *kvm);



static inline int vgic_v3_max_apr_idx(struct kvm_vcpu *vcpu)

{

	struct vgic_cpu *cpu_if = &vcpu->arch.vgic_cpu;



	/*

	 * num_pri_bits are initialized with HW supported values.

	 * We can rely safely on num_pri_bits even if VM has not

	 * restored ICC_CTLR_EL1 before restoring APnR registers.

	 */

	switch (cpu_if->num_pri_bits) {

	case 7: return 3;

	case 6: return 1;

	default: return 0;

	}

}



#endif