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KVM: arm64: Add get_reg_by_id() as a sys_reg_desc retrieving helper
find_reg_by_id() requires a sys_reg_param as input, which most users provide as a on-stack variable, but don't make any use of the result. Provide a helper that doesn't have this requirement and simplify the callers (all but one). Reviewed-by: Reiji Watanabe <reijiw@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org>
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a111daf0c5
commit
da8d120fba
3 changed files with 23 additions and 17 deletions
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@ -2650,21 +2650,29 @@ const struct sys_reg_desc *find_reg_by_id(u64 id,
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return find_reg(params, table, num);
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}
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const struct sys_reg_desc *get_reg_by_id(u64 id,
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const struct sys_reg_desc table[],
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unsigned int num)
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{
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struct sys_reg_params params;
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if (!index_to_params(id, ¶ms))
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return NULL;
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return find_reg(¶ms, table, num);
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}
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/* Decode an index value, and find the sys_reg_desc entry. */
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static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu,
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u64 id)
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{
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const struct sys_reg_desc *r;
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struct sys_reg_params params;
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/* We only do sys_reg for now. */
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if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG)
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return NULL;
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if (!index_to_params(id, ¶ms))
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return NULL;
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r = find_reg(¶ms, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
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r = get_reg_by_id(id, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
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/* Not saved in the sys_reg array and not otherwise accessible? */
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if (r && !(r->reg || r->get_user))
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@ -2723,10 +2731,9 @@ static int reg_to_user(void __user *uaddr, const u64 *val, u64 id)
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static int get_invariant_sys_reg(u64 id, void __user *uaddr)
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{
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struct sys_reg_params params;
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const struct sys_reg_desc *r;
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r = find_reg_by_id(id, ¶ms, invariant_sys_regs,
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r = get_reg_by_id(id, invariant_sys_regs,
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ARRAY_SIZE(invariant_sys_regs));
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if (!r)
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return -ENOENT;
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@ -2736,12 +2743,11 @@ static int get_invariant_sys_reg(u64 id, void __user *uaddr)
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static int set_invariant_sys_reg(u64 id, void __user *uaddr)
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{
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struct sys_reg_params params;
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const struct sys_reg_desc *r;
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int err;
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u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */
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r = find_reg_by_id(id, ¶ms, invariant_sys_regs,
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r = get_reg_by_id(id, invariant_sys_regs,
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ARRAY_SIZE(invariant_sys_regs));
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if (!r)
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return -ENOENT;
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@ -195,6 +195,10 @@ const struct sys_reg_desc *find_reg_by_id(u64 id,
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const struct sys_reg_desc table[],
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unsigned int num);
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const struct sys_reg_desc *get_reg_by_id(u64 id,
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const struct sys_reg_desc table[],
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unsigned int num);
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#define AA32(_x) .aarch32_map = AA32_##_x
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#define Op0(_x) .Op0 = _x
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#define Op1(_x) .Op1 = _x
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@ -263,13 +263,9 @@ static const struct sys_reg_desc gic_v3_icc_reg_descs[] = {
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int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
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u64 *reg)
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{
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struct sys_reg_params params;
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u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;
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params.regval = *reg;
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params.is_write = is_write;
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if (find_reg_by_id(sysreg, ¶ms, gic_v3_icc_reg_descs,
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if (get_reg_by_id(sysreg, gic_v3_icc_reg_descs,
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ARRAY_SIZE(gic_v3_icc_reg_descs)))
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return 0;
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