linux-kernel - [PATCH 25/26] mm: asi: Stop ignoring asi=on cmdline flag

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Message-ID: <20240712-asi-rfc-24-v1-25-144b319a40d8@google.com>
Date: Fri, 12 Jul 2024 17:00:43 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, 
	Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Alexandre Chartre <alexandre.chartre@...cle.com>, Liran Alon <liran.alon@...cle.com>, 
	Jan Setje-Eilers <jan.setjeeilers@...cle.com>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Mel Gorman <mgorman@...e.de>, 
	Lorenzo Stoakes <lstoakes@...il.com>, David Hildenbrand <david@...hat.com>, Vlastimil Babka <vbabka@...e.cz>, 
	Michal Hocko <mhocko@...nel.org>, Khalid Aziz <khalid.aziz@...cle.com>, 
	Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, 
	Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>, 
	Valentin Schneider <vschneid@...hat.com>, Paul Turner <pjt@...gle.com>, Reiji Watanabe <reijiw@...gle.com>, 
	Junaid Shahid <junaids@...gle.com>, Ofir Weisse <oweisse@...gle.com>, 
	Yosry Ahmed <yosryahmed@...gle.com>, Patrick Bellasi <derkling@...gle.com>, 
	KP Singh <kpsingh@...gle.com>, Alexandra Sandulescu <aesa@...gle.com>, 
	Matteo Rizzo <matteorizzo@...gle.com>, Jann Horn <jannh@...gle.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	kvm@...r.kernel.org, Brendan Jackman <jackmanb@...gle.com>
Subject: [PATCH 25/26] mm: asi: Stop ignoring asi=on cmdline flag

At this point the minimum requirements are in place for the kernel to
operate correctly with ASI enabled.

Signed-off-by: Brendan Jackman <jackmanb@...gle.com>
---
 arch/x86/mm/asi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/asi.c b/arch/x86/mm/asi.c
index 891b8d351df8..6cf0af1bfa07 100644
--- a/arch/x86/mm/asi.c
+++ b/arch/x86/mm/asi.c
@@ -174,14 +174,14 @@ void __init asi_check_boottime_disable(void)
 		pr_info("ASI disabled through kernel command line.\n");
 	} else if (ret == 2 && !strncmp(arg, "on", 2)) {
 		enabled = true;
-		pr_info("Ignoring asi=on param while ASI implementation is incomplete.\n");
+		pr_info("ASI enabled through kernel command line.\n");
 	} else {
 		pr_info("ASI %s by default.\n",
 			enabled ? "enabled" : "disabled");
 	}
 
 	if (enabled)
-		pr_info("ASI enablement ignored due to incomplete implementation.\n");
+		setup_force_cpu_cap(X86_FEATURE_ASI);
 }
 
 /*

-- 
2.45.2.993.g49e7a77208-goog