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

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To: Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Fri, 31 May 2024 15:10:43 +0200
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>, Michael Roth <michael.roth@xxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-coco@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-crypto@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, jroedel@xxxxxxx, thomas.lendacky@xxxxxxx, hpa@xxxxxxxxx, ardb@xxxxxxxxxx, vkuznets@xxxxxxxxxx, jmattson@xxxxxxxxxx, luto@xxxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, slp@xxxxxxxxxx, pgonda@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, srinivas.pandruvada@xxxxxxxxxxxxxxx, rientjes@xxxxxxxxxx, dovmurik@xxxxxxxxxxxxx, tobin@xxxxxxx, bp@xxxxxxxxx, vbabka@xxxxxxx, kirill@xxxxxxxxxxxxx, ak@xxxxxxxxxxxxxxx, tony.luck@xxxxxxxxx, sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx, alpergun@xxxxxxxxxx, jarkko@xxxxxxxxxx, ashish.kalra@xxxxxxx, nikunj.dadhania@xxxxxxx, pankaj.gupta@xxxxxxx, liam.merwick@xxxxxxxxxx, Brijesh Singh <brijesh.singh@xxxxxxx>, Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
In-reply-to: <3999aadf-92a8-43f9-8d9d-84aa47e7d1ae@linux.intel.com>
References: <20240501085210.2213060-1-michael.roth@amd.com> <20240501085210.2213060-10-michael.roth@amd.com> <84e8460d-f8e7-46d7-a274-90ea7aec2203@linux.intel.com> <CABgObfaXmMUYHEuK+D+2E9pybKMJqGZsKB033X1aOSQHSEqqVA@mail.gmail.com> <7d6a4320-89f5-48ce-95ff-54b00e7e9597@linux.intel.com> <rczrxq3lhqguarwh4cwxwa35j5riiagbilcw32oaxd7aqpyaq7@6bqrqn6ontba> <7da9c4a3-8597-44aa-a7ad-cc2bd2a85024@linux.intel.com> <CABgObfajCDkbDbK6-QyZABGTh=5rmE5q3ifvHfZD1A2Z+u0v3A@mail.gmail.com> <ZleJvmCawKqmpFIa@google.com> <3999aadf-92a8-43f9-8d9d-84aa47e7d1ae@linux.intel.com>

On Fri, May 31, 2024 at 3:23 AM Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx> 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

References:
- [PATCH v15 00/20] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Michael Roth
- [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
  - From: Michael Roth
- Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
  - From: Binbin Wu
- Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
  - From: Paolo Bonzini
- Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
  - From: Binbin Wu
- Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
  - From: Michael Roth
- Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
  - From: Binbin Wu
- Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
  - From: Paolo Bonzini
- Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
  - From: Sean Christopherson
- Re: [PATCH v15 09/20] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT
  - From: Binbin Wu

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