linux-kernel - Re: [PATCH v19 027/130] KVM: TDX: Define TDX architectural definitions

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Message-ID: <ZeGC64sAzg4EN3G5@yzhao56-desk.sh.intel.com>
Date: Fri, 1 Mar 2024 15:25:31 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: <isaku.yamahata@...el.com>
CC: <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<isaku.yamahata@...il.com>, Paolo Bonzini <pbonzini@...hat.com>,
	<erdemaktas@...gle.com>, Sean Christopherson <seanjc@...gle.com>, Sagi Shahar
	<sagis@...gle.com>, Kai Huang <kai.huang@...el.com>, <chen.bo@...el.com>,
	<hang.yuan@...el.com>, <tina.zhang@...el.com>, Sean Christopherson
	<sean.j.christopherson@...el.com>, Xiaoyao Li <xiaoyao.li@...el.com>
Subject: Re: [PATCH v19 027/130] KVM: TDX: Define TDX architectural
 definitions

> + * TD_PARAMS is provided as an input to TDH_MNG_INIT, the size of which is 1024B.
> + */
> +#define TDX_MAX_VCPUS	(~(u16)0)
This value will be treated as -1 in tdx_vm_init(),
	"kvm->max_vcpus = min(kvm->max_vcpus, TDX_MAX_VCPUS);"

This will lead to kvm->max_vcpus being -1 by default.
Is this by design or just an error?
If it's by design, why not set kvm->max_vcpus = -1 in tdx_vm_init() directly.
If an unexpected error, may below is better?

#define TDX_MAX_VCPUS   (int)((u16)(~0UL))
or
#define TDX_MAX_VCPUS 65536