linux-kernel - Re: [PATCH v5 3/6] LoongArch: KVM: Add cpucfg area for kvm hypervisor

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Message-ID: <f1ba53fd2a99949187ca392c6d4488d3d5aeaf88.camel@xry111.site>
Date: Tue, 27 Feb 2024 17:05:59 +0800
From: Xi Ruoyao <xry111@...111.site>
To: maobibo <maobibo@...ngson.cn>, Jiaxun Yang <jiaxun.yang@...goat.com>, 
	Huacai Chen <chenhuacai@...nel.org>
Cc: Tianrui Zhao <zhaotianrui@...ngson.cn>, Juergen Gross <jgross@...e.com>,
  Paolo Bonzini <pbonzini@...hat.com>, loongarch@...ts.linux.dev,
 linux-kernel@...r.kernel.org,  virtualization@...ts.linux.dev,
 kvm@...r.kernel.org
Subject: Re: [PATCH v5 3/6] LoongArch: KVM: Add cpucfg area for kvm
 hypervisor

On Tue, 2024-02-27 at 15:09 +0800, maobibo wrote:

> It is difficult to find an area unused by HW for CSR method since the 
> small CSR ID range.

We may use IOCSR instead.  In kernel/cpu-probe.c there are already some
IOCSR reads.

> It is difficult to find an area unused by HW for CSR method since the 
> small CSR ID range. However it is easy for cpucfg. Here I doubt whether 
> you really know about LoongArch LVZ.

It's unfair to accuse the others for not knowing about LVZ considering
the lack of public documentation.

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University