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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: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Christoffer Dall 2017-09-01 11:41:52 +02:00
parent 7c7d2fa1cd
commit 50f5bd5718
2 changed files with 19 additions and 20 deletions
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23
arch/arm64/kvm/vgic-sys-reg-v3.c
View File

@ -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)
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);
}
if (idx > vgic_v3_max_apr_idx(vcpu))
goto err;
vgic_v3_access_apr_reg(vcpu, p, apr, idx);
return true;
err:
if (!p->is_write)

16
virt/kvm/arm/vgic/vgic.h
View File

@ -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