On 5/23/2022 4:45 PM, Gerd Hoffmann wrote:
Hi,
+ do {
+ size = sizeof(struct kvm_tdx_capabilities) +
+ max_ent * sizeof(struct kvm_tdx_cpuid_config);
+ caps = g_malloc0(size);
+ caps->nr_cpuid_configs = max_ent;
+
+ r = tdx_platform_ioctl(KVM_TDX_CAPABILITIES, 0, caps);
+ if (r == -E2BIG) {
+ g_free(caps);
+ max_ent *= 2;
+ } else if (r < 0) {
+ error_report("KVM_TDX_CAPABILITIES failed: %s\n", strerror(-r));
+ exit(1);
+ }
+ }
+ while (r == -E2BIG);
This should have a limit for the number of loop runs.
Actually, this logic is copied from get_supported_cpuid().
Anyway, I can put a maximum limit as 256 (it should be large enough) or
maybe re-use KVM_MAX_CPUID_ENTRIES. When it gets hit, we know we need to
update QEMU to fit with TDX on new platform.
take care,
Gerd
