linux-kernel - Re: [PATCH v19 037/130] KVM: TDX: Make KVM_CAP_MAX

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Date: Fri, 10 May 2024 10:47:37 +1200
From: "Huang, Kai" <kai.huang@...el.com>
To: Sean Christopherson <seanjc@...gle.com>, <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>, Sagi Shahar <sagis@...gle.com>, <chen.bo@...el.com>,
	<hang.yuan@...el.com>, <tina.zhang@...el.com>
Subject: Re: [PATCH v19 037/130] KVM: TDX: Make KVM_CAP_MAX_VCPUS backend
 specific

> 
> Implement the callback for TDX guest to check whether the maximum vCPUs
> passed from usrspace can be supported by TDX, and if it can, override
> Accordingly, in the KVM_CHECK_EXTENSION IOCTL(), change to return the
> 'struct kvm::max_vcpus' for a given VM for the KVM_CAP_MAX_VCPUS.

Sorry some error during copy/paste.  The above should be:

Implement the callback for TDX guest to check whether the maximum vCPUs
passed from usrspace can be supported by TDX, and if it can, override
the 'struct kvm::max_vcpus'.  Leave VMX guests and all AMD guests
unsupported to avoid any side-effect for those VMs.

Accordingly, in the KVM_CHECK_EXTENSION IOCTL(), change to return the
'struct kvm::max_vcpus' for a given VM for the KVM_CAP_MAX_VCPUS.