linux-kernel - Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT

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Message-ID: <CABgObfZZsJxQ5AKve+GYJiUB0cFc70qkDbvRB82KrvHvM0k3jg@mail.gmail.com>
Date: Fri, 31 May 2024 15:10:43 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: Binbin Wu <binbin.wu@...ux.intel.com>
Cc: Sean Christopherson <seanjc@...gle.com>, Michael Roth <michael.roth@....com>, kvm@...r.kernel.org, 
	linux-coco@...ts.linux.dev, linux-mm@...ck.org, linux-crypto@...r.kernel.org, 
	x86@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de, 
	mingo@...hat.com, jroedel@...e.de, thomas.lendacky@....com, hpa@...or.com, 
	ardb@...nel.org, vkuznets@...hat.com, jmattson@...gle.com, luto@...nel.org, 
	dave.hansen@...ux.intel.com, slp@...hat.com, pgonda@...gle.com, 
	peterz@...radead.org, srinivas.pandruvada@...ux.intel.com, 
	rientjes@...gle.com, dovmurik@...ux.ibm.com, tobin@....com, bp@...en8.de, 
	vbabka@...e.cz, kirill@...temov.name, ak@...ux.intel.com, tony.luck@...el.com, 
	sathyanarayanan.kuppuswamy@...ux.intel.com, alpergun@...gle.com, 
	jarkko@...nel.org, ashish.kalra@....com, nikunj.dadhania@....com, 
	pankaj.gupta@....com, liam.merwick@...cle.com, 
	Brijesh Singh <brijesh.singh@....com>, Isaku Yamahata <isaku.yamahata@...el.com>
Subject: Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page
 State Change VMGEXIT

On Fri, May 31, 2024 at 3:23 AM Binbin Wu <binbin.wu@...ux.intel.com> wrote:
> About the chunk size, if it is too small, it will increase the cost of
> kernel/userspace context switches.
> Maybe 2MB?

Yeah, 2MB sounds right.

Paolo