linux-kernel - Re: [PATCH v6 5/9] KVM: VMX: Track CPU's MSR_IA32_VMX

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Date: Wed, 27 Mar 2024 10:38:36 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "luto@...nel.org" <luto@...nel.org>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "x86@...nel.org" <x86@...nel.org>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"peterz@...radead.org" <peterz@...radead.org>, "bp@...en8.de" <bp@...en8.de>,
	"mingo@...hat.com" <mingo@...hat.com>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "pbonzini@...hat.com" <pbonzini@...hat.com>
CC: "Li, Xin3" <xin3.li@...el.com>, "kvm@...r.kernel.org"
	<kvm@...r.kernel.org>, "Kang, Shan" <shan.kang@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 5/9] KVM: VMX: Track CPU's MSR_IA32_VMX_BASIC as a
 single 64-bit value

On Fri, 2024-03-08 at 17:27 -0800, Sean Christopherson wrote:
> Track the "basic" capabilities VMX MSR as a single u64 in vmcs_config
> instead of splitting it across three fields, that obviously don't combine
> into a single 64-bit value, so that KVM can use the macros that define MSR
> bits using their absolute position.  Replace all open coded shifts and
> masks, many of which are relative to the "high" half, with the appropriate
> macro.
> 
> Opportunistically use VMX_BASIC_32BIT_PHYS_ADDR_ONLY instead of an open
> coded equivalent, and clean up the related comment to not reference a
> specific SDM section (to the surprise of no one, the comment is stale).
> 
> No functional change intended (though obviously the code generation will
> be quite different).
> 
> Cc: Shan Kang <shan.kang@...el.com>
> Cc: Kai Huang <kai.huang@...el.com>
> Signed-off-by: Xin Li <xin3.li@...el.com>
> [sean: split to separate patch, write changelog]
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> 

Thanks for doing this:

Reviewed-by: Kai Huang <kai.huang@...el.com>