[v3,0/2] kvm: sev: Add SNP guest request throttling

Message

Dionna Amalie Glaze Jan. 19, 2023, 9:34 p.m. UTC

This patch series is based on

[RFC,v7,00/64] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support

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 v2:
  * Rebased on v7, changed "we" wording to passive voice.
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            | 47 +++++++++++++++++++++++++++++--
 arch/x86/kvm/svm/svm.h            |  3 ++
 include/uapi/linux/in.h           |  1 +
 4 files changed, 50 insertions(+), 2 deletions(-)