linux-kernel - Re: [PATCH v4 1/2] KVM: VMX: Cleanup VMX basic information defines and usages

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Date: Thu, 18 Jan 2024 03:13:31 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "Li, Xin3" <xin3.li@...el.com>, "kvm@...r.kernel.org"
	<kvm@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "Yang, Weijiang" <weijiang.yang@...el.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "x86@...nel.org" <x86@...nel.org>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "hpa@...or.com"
	<hpa@...or.com>, "mingo@...hat.com" <mingo@...hat.com>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "bp@...en8.de" <bp@...en8.de>, "pbonzini@...hat.com"
	<pbonzini@...hat.com>
Subject: Re: [PATCH v4 1/2] KVM: VMX: Cleanup VMX basic information defines
 and usages

On Fri, 2024-01-12 at 01:34 -0800, Xin Li wrote:
> Define VMX basic information fields with BIT_ULL()/GENMASK_ULL(), and
> replace hardcoded VMX basic numbers with these field macros.
> 
> Per Sean's ask, save the full/raw value of MSR_IA32_VMX_BASIC in the
> global vmcs_config as type u64 to get rid of the hi/lo crud, and then
> use VMX_BASIC helpers to extract info as needed.
> 
> Tested-by: Shan Kang <shan.kang@...el.com>
> Signed-off-by: Xin Li <xin3.li@...el.com>
> ---
> 

[...]

> +/* x86 memory types, explicitly used in VMX only */
> +#define MEM_TYPE_WB				0x6ULL
> +#define MEM_TYPE_UC				0x0ULL
> +

[...]

> -#define VMX_EPTP_MT_WB				0x6ull
> -#define VMX_EPTP_MT_UC				0x0ull

Could you also put some words to the changelog to justify your change around
memory type macros?