linux-kernel - [PATCH 0/2] Add support for the ERAPS feature

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Message-ID: <20241031153925.36216-1-amit@kernel.org>
Date: Thu, 31 Oct 2024 16:39:23 +0100
From: Amit Shah <amit@...nel.org>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	x86@...nel.org,
	linux-doc@...r.kernel.org
Cc: amit.shah@....com,
	thomas.lendacky@....com,
	bp@...en8.de,
	tglx@...utronix.de,
	peterz@...radead.org,
	jpoimboe@...nel.org,
	pawan.kumar.gupta@...ux.intel.com,
	corbet@....net,
	mingo@...hat.com,
	dave.hansen@...ux.intel.com,
	hpa@...or.com,
	seanjc@...gle.com,
	pbonzini@...hat.com,
	daniel.sneddon@...ux.intel.com,
	kai.huang@...el.com,
	sandipan.das@....com,
	boris.ostrovsky@...cle.com,
	Babu.Moger@....com,
	david.kaplan@....com
Subject: [PATCH 0/2] Add support for the ERAPS feature

From: Amit Shah <amit.shah@....com>

Newer AMD CPUs (Turin+) have the ERAPS feature bit that allows us to remove
the RSB filling loops required during context switches and VM exits.

This patchset implements the feature to:
* remove the need for RSB filling on context switches and VMEXITs in host and
  guests
* allow KVM guests to use the full default RSB stack

Amit Shah (2):
  x86: cpu/bugs: add support for AMD ERAPS feature
  x86: kvm: svm: add support for ERAPS and FLUSH_RAP_ON_VMRUN

 Documentation/admin-guide/hw-vuln/spectre.rst |  5 ++-
 arch/x86/include/asm/cpufeatures.h            |  1 +
 arch/x86/include/asm/nospec-branch.h          | 11 +++++
 arch/x86/include/asm/svm.h                    |  6 ++-
 arch/x86/kernel/cpu/bugs.c                    | 36 ++++++++++-----
 arch/x86/kvm/cpuid.c                          | 15 ++++++-
 arch/x86/kvm/svm/svm.c                        | 44 +++++++++++++++++++
 arch/x86/kvm/svm/svm.h                        | 15 +++++++
 8 files changed, 118 insertions(+), 15 deletions(-)

-- 
2.47.0