linux-kernel - [PATCH v2 0/2] kvm: sev: Add SNP guest request throttling

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Message-ID: <20221117181127.1859634-1-dionnaglaze@google.com>
Date:   Thu, 17 Nov 2022 18:11:25 +0000
From:   Dionna Glaze <dionnaglaze@...gle.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Dionna Glaze <dionnaglaze@...gle.com>
Subject: [PATCH v2 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.

Changes since v1:
  * Added missing Ccs to patches.

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(-)

-- 
2.38.1.584.g0f3c55d4c2-goog