linux-kernel - [PATCH 0/2] kvm: sev: Add SNP guest request throttling

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Date:   Tue,  8 Nov 2022 21:32:24 +0000
From:   Dionna Glaze <dionnaglaze@...gle.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Dionna Glaze <dionnaglaze@...gle.com>,
        Tom Lendacky <Thomas.Lendacky@....com>,
        Ashish Kalra <Ashish.Kalra@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Joerg Roedel <jroedel@...e.de>,
        Peter Gonda <pgonda@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [PATCH 0/2] kvm: sev: Add SNP guest request throttling

This patch series is based on

[PATCH Part2 v6 00/49] Add AMD Secure Nested Paging (SEV-SNP)

and is requested to be rolled into the upcoming v7 of that patch series.

The GHCB specification recommends that SNP guest requests should be
rate limited. This 2 patch series adds such rate limiting with a 2
burst, 2 second interval per VM as the default values for two new
kvm-amd module parameters:
  guest_request_throttle_s
  guest_request_throttle_burst

This patch series cooperates with the guest series,

 Add throttling detection to sev-guest

in order for guests to retry when throttled, rather than disable the
VMPCK and fail to complete their request.

Cc: Tom Lendacky <Thomas.Lendacky@....com>
Cc: Ashish Kalra <Ashish.Kalra@....com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Joerg Roedel <jroedel@...e.de>
Cc: Peter Gonda <pgonda@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>

Signed-off-by: Dionna Glaze <dionnaglaze@...gle.com>

Dionna Glaze (2):
  kvm: sev: Add SEV-SNP guest request throttling
  kvm: sev: If ccp is busy, report throttled to guest

 arch/x86/include/asm/sev-common.h |  1 +
 arch/x86/kvm/svm/sev.c            | 46 +++++++++++++++++++++++++++++--
 arch/x86/kvm/svm/svm.h            |  3 ++
 3 files changed, 48 insertions(+), 2 deletions(-)

-- 
2.38.1.431.g37b22c650d-goog