linux-kernel - [PATCH 0/2] Support for SEV-ES guest shadow stack

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Message-ID: <20250806204659.59099-1-john.allen@amd.com>
Date: Wed, 6 Aug 2025 20:46:57 +0000
From: John Allen <john.allen@....com>
To: <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
	<seanjc@...gle.com>, <pbonzini@...hat.com>, <dave.hansen@...el.com>
CC: <rick.p.edgecombe@...el.com>, <mlevitsk@...hat.com>,
	<weijiang.yang@...el.com>, <chao.gao@...el.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>, <hpa@...or.com>, <mingo@...hat.com>,
	<tglx@...utronix.de>, <thomas.lendacky@....com>, John Allen
	<john.allen@....com>
Subject: [PATCH 0/2] Support for SEV-ES guest shadow stack

For shadow stack support in SVM when using SEV-ES, the guest kernel needs to
save XSS to the GHCB in order for the hypervisor to determine the XSAVES save
area size.

This series can be applied independently of the hypervisor series in order to
support non-KVM hypervisors.

John Allen (2):
  x86/boot: Move boot_*msr helpers to asm/shared/msr.h
  x86/sev-es: Include XSS value in GHCB CPUID request

 arch/x86/boot/compressed/sev.c    |  7 ++++---
 arch/x86/boot/compressed/sev.h    |  6 +++---
 arch/x86/boot/cpucheck.c          | 16 ++++++++--------
 arch/x86/boot/msr.h               | 26 --------------------------
 arch/x86/coco/sev/vc-shared.c     | 11 +++++++++++
 arch/x86/include/asm/shared/msr.h | 15 +++++++++++++++
 arch/x86/include/asm/svm.h        |  1 +
 7 files changed, 42 insertions(+), 40 deletions(-)
 delete mode 100644 arch/x86/boot/msr.h

-- 
2.34.1