linux-kernel - [PATCH v2 0/2] KVM: SEV: Add support for the ALLOWED_SEV

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240822221938.2192109-1-kim.phillips@amd.com>
Date: Thu, 22 Aug 2024 17:19:36 -0500
From: Kim Phillips <kim.phillips@....com>
To: <kvm@...r.kernel.org>, <linux-coco@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <x86@...nel.org>
CC: Tom Lendacky <thomas.lendacky@....com>, Michael Roth
	<michael.roth@....com>, Ashish Kalra <ashish.kalra@....com>, "Nikunj A .
 Dadhania" <nikunj@....com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, Sean Christopherson <seanjc@...gle.com>,
	"Paolo Bonzini" <pbonzini@...hat.com>, Ingo Molnar <mingo@...hat.com>, "H.
 Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2 0/2] KVM: SEV: Add support for the ALLOWED_SEV_FEATURES feature

AMD EPYC 5th generation processors have introduced a feature that allows
the hypervisor to control the SEV_FEATURES that are set for, or by, a
guest.  ALLOWED_SEV_FEATURES can be used by the hypervisor to enforce
that SEV-ES and SEV-SNP guests cannot enable features that the
hypervisor does not want to be enabled.

Patch 1/2 adds support to detect the feature.

Patch 2/2 configures the ALLOWED_SEV_FEATURES field in the VMCB
according to the features the hypervisor supports.

Based on tip/master commit a2767e7f31ad ("Merge branch into tip/master: 'x86/timers'")

v2:
 - Added some SEV_FEATURES require to be explicitly allowed by
   ALLOWED_SEV_FEATURES wording (Sean).
 - Added Nikunj's Reviewed-by.

v1:
 https://lore.kernel.org/lkml/20240802015732.3192877-1-kim.phillips@amd.com/

Kim Phillips (2):
  x86/cpufeatures: Add "Allowed SEV Features" Feature
  KVM: SEV: Configure "ALLOWED_SEV_FEATURES" VMCB Field

 arch/x86/include/asm/cpufeatures.h | 1 +
 arch/x86/include/asm/svm.h         | 6 +++++-
 arch/x86/kvm/svm/sev.c             | 5 +++++
 3 files changed, 11 insertions(+), 1 deletion(-)

-- 
2.34.1