On 11/28/2011 11:20 AM, Sasha Levin wrote:
> This patch cleans and simplifies kvm_dev_ioctl_get_supported_cpuid by using a
> table
> instead of duplicating code as Avi suggested.
>
> This patch also fixes a bug where kvm_dev_ioctl_get_supported_cpuid would
> return
> -E2BIG when amount of entries passed was just right.
>
> do_cpuid_1_ent(entry, function, index);
> ++*nent;
>
> @@ -275,7 +282,10 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry,
> u32 function,
>
> entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
> entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
> - for (t = 1; t < times && *nent < maxnent; ++t) {
> + for (t = 1; t < times; ++t) {
> + if (*nent >= maxnent)
> + goto out;
> +
> do_cpuid_1_ent(&entry[t], function, 0);
> entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
> ++*nent;
Please move the check into do_cpuid_1_ent(); it's more consistent.
> @@ -296,6 +309,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry,
> u32 function,
> entry[i].flags |=
> KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
> ++*nent;
> +
> }
> break;
Spurious?
> }
> @@ -335,7 +352,10 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry,
> u32 function,
> int idx, i;
>
> entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
> - for (idx = 1, i = 1; *nent < maxnent && idx < 64; ++idx) {
> + for (idx = 1, i = 1; idx < 64; ++idx) {
> + if (*nent >= maxnent)
> + goto out;
> +
> do_cpuid_1_ent(&entry[i], function, idx);
> if (entry[i].eax == 0 || !supported_xcr0_bit(idx))
> continue;
This would go away too then.
--
error compiling committee.c: too many arguments to function
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