linux-kernel - [PATCH v2 0/2] Add throttling detection to sev-guest

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Message-ID: <20221019173537.1238121-1-dionnaglaze@google.com>
Date:   Wed, 19 Oct 2022 17:35:35 +0000
From:   Dionna Glaze <dionnaglaze@...gle.com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Dionna Glaze <dionnaglaze@...gle.com>,
        Tom Lendacky <Thomas.Lendacky@....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 v2 0/2] Add throttling detection to sev-guest

The guest request synchronous API from SEV-SNP VMs to the host's security
processor consumes a global resource. For this reason, AMD's docs
recommend that the host implements a throttling mechanism. In order for
the guest to know it's been throttled and should try its request again,
we need some good-faith communication from the host that the request
has been throttled.

These patches work with the existing /dev/sev-guest ABI to detect a
throttling code.

Changes from v1:
  * Changed throttle error code to 2

Cc: Tom Lendacky <Thomas.Lendacky@....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):
  x86/sev: Rename snp_guest_issue_request's fw_err
  virt/coco/sev-guest: interpret VMM errors from guest request

 arch/x86/include/asm/sev.h              |  4 +--
 arch/x86/kernel/sev.c                   |  6 ++---
 drivers/virt/coco/sev-guest/sev-guest.c | 34 +++++++++++++++++--------
 include/uapi/linux/sev-guest.h          | 16 ++++++++++--
 4 files changed, 42 insertions(+), 18 deletions(-)

-- 
2.38.0.413.g74048e4d9e-goog