linux-kernel - RE: [PATCH v2 00/25] Enable FRED with KVM VMX

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Date: Mon, 15 Apr 2024 17:58:58 +0000
From: "Li, Xin3" <xin3.li@...el.com>
To: "Li, Xin3" <xin3.li@...el.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
CC: "seanjc@...gle.com" <seanjc@...gle.com>, "pbonzini@...hat.com"
	<pbonzini@...hat.com>, "corbet@....net" <corbet@....net>,
	"tglx@...utronix.de" <tglx@...utronix.de>, "mingo@...hat.com"
	<mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "x86@...nel.org"
	<x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>, "shuah@...nel.org"
	<shuah@...nel.org>, "vkuznets@...hat.com" <vkuznets@...hat.com>,
	"peterz@...radead.org" <peterz@...radead.org>, "Shankar, Ravi V"
	<ravi.v.shankar@...el.com>, "xin@...or.com" <xin@...or.com>
Subject: RE: [PATCH v2 00/25] Enable FRED with KVM VMX

> This patch set enables the Intel flexible return and event delivery
> (FRED) architecture with KVM VMX to allow guests to utilize FRED.
> 

<snip>

> 
> Intel VMX architecture is extended to run FRED guests, and the major changes
> are:
> 
> 1) New VMCS fields for FRED context management, which includes two new
> event data VMCS fields, eight new guest FRED context VMCS fields and eight new
> host FRED context VMCS fields.
> 
> 2) VMX nested-exception support for proper virtualization of stack levels
> introduced with FRED architecture.
> 

<snip>

> 
> Patch 1-2 are cleanups to VMX basic and misc MSRs, which were sent out earlier
> as a preparation for FRED changes:
> https://lore.kernel.org/kvm/20240206182032.1596-1-xin3.li@intel.com/T/#u

Obviously I will drop the 2 clean patches in the next iteration.

> Patch 3-15 add FRED support to VMX.
> Patch 16-21 add FRED support to nested VMX.
> Patch 22 exposes FRED and its baseline features to KVM guests.
> Patch 23-25 add FRED selftests.

Please help to review and comment on the FRED KVM/VMX patches.

Thanks!
    Xin