Commit 4b927b94 authored by Vijaya Kumar K's avatar Vijaya Kumar K Committed by Marc Zyngier

KVM: arm/arm64: vgic: Introduce find_reg_by_id()

In order to implement vGICv3 CPU interface access, we will need to perform
table lookup of system registers. We would need both index_to_params() and
find_reg() exported for that purpose, but instead we export a single
function which combines them both.
Signed-off-by: default avatarPavel Fedin <p.fedin@samsung.com>
Signed-off-by: default avatarVijaya Kumar K <Vijaya.Kumar@cavium.com>
Reviewed-by: default avatarAndre Przywara <andre.przywara@arm.com>
Reviewed-by: default avatarEric Auger <eric.auger@redhat.com>
Acked-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 94574c94
......@@ -1795,6 +1795,17 @@ static bool index_to_params(u64 id, struct sys_reg_params *params)
}
}
const struct sys_reg_desc *find_reg_by_id(u64 id,
struct sys_reg_params *params,
const struct sys_reg_desc table[],
unsigned int num)
{
if (!index_to_params(id, params))
return NULL;
return find_reg(params, table, num);
}
/* Decode an index value, and find the sys_reg_desc entry. */
static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu,
u64 id)
......@@ -1807,11 +1818,8 @@ static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu,
if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG)
return NULL;
if (!index_to_params(id, &params))
return NULL;
table = get_target_table(vcpu->arch.target, true, &num);
r = find_reg(&params, table, num);
r = find_reg_by_id(id, &params, table, num);
if (!r)
r = find_reg(&params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
......@@ -1918,10 +1926,8 @@ static int get_invariant_sys_reg(u64 id, void __user *uaddr)
struct sys_reg_params params;
const struct sys_reg_desc *r;
if (!index_to_params(id, &params))
return -ENOENT;
r = find_reg(&params, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs));
r = find_reg_by_id(id, &params, invariant_sys_regs,
ARRAY_SIZE(invariant_sys_regs));
if (!r)
return -ENOENT;
......@@ -1935,9 +1941,8 @@ static int set_invariant_sys_reg(u64 id, void __user *uaddr)
int err;
u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */
if (!index_to_params(id, &params))
return -ENOENT;
r = find_reg(&params, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs));
r = find_reg_by_id(id, &params, invariant_sys_regs,
ARRAY_SIZE(invariant_sys_regs));
if (!r)
return -ENOENT;
......
......@@ -136,6 +136,10 @@ static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
return i1->Op2 - i2->Op2;
}
const struct sys_reg_desc *find_reg_by_id(u64 id,
struct sys_reg_params *params,
const struct sys_reg_desc table[],
unsigned int num);
#define Op0(_x) .Op0 = _x
#define Op1(_x) .Op1 = _x
......
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