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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 9/3/24 09:19, Tony Lindgren wrote: >>> + gpa_t gpa_bits = gfn_to_gpa(kvm_gfn_direct_bits(vcpu->kvm)); >>> + unsigned int g_maxpa = __ffs(gpa_bits) + 1; >>> + >>> + output_e->eax &= ~0x00ff0000; >>> + output_e->eax |= g_maxpa << 16; >> Is it possible this workaround escapes the KVM supported bits check? > > Yes it might need a mask for (g_maxpa << 16) & 0x00ff0000 to avoid setting > the wrong bits, will check. The mask is okay, __ffs(gpa_bits) + 1 will be between 1 and 64. The question is whether the TDX module will accept nonzero bits 16..23 of CPUID[0x80000008].EAX. Paolo