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[192.237.175.120]) by mx.google.com with ESMTPS id q185si20317664ywf.50.2019.01.28.03.52.28 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 28 Jan 2019 03:52:28 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of xen-devel-bounces@lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of xen-devel-bounces@lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1go5Qx-00034Y-MP; Mon, 28 Jan 2019 11:50:35 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1go5Qw-00034O-GN for xen-devel@lists.xenproject.org; Mon, 28 Jan 2019 11:50:34 +0000 X-Inumbo-ID: eb3606dc-22f2-11e9-bc5a-afb3584a4595 Received: from foss.arm.com (unknown [217.140.101.70]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTP id eb3606dc-22f2-11e9-bc5a-afb3584a4595; Mon, 28 Jan 2019 11:50:33 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5642015AD; Mon, 28 Jan 2019 03:50:33 -0800 (PST) Received: from e108454-lin.cambridge.arm.com (e108454-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 695B53F59C; Mon, 28 Jan 2019 03:50:32 -0800 (PST) From: Julien Grall To: xen-devel@lists.xenproject.org Date: Mon, 28 Jan 2019 11:50:20 +0000 Message-Id: <20190128115026.3336-2-julien.grall@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190128115026.3336-1-julien.grall@arm.com> References: <20190128115026.3336-1-julien.grall@arm.com> Subject: [Xen-devel] [PATCH for-4.12 v2 1/7] xen/arm: Only set necessary flags when initializing HCR_EL2 X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Julien Grall , sstabellini@kernel.org, Andrii Anisov MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Only {A,F,I}MO are necessary to receive interrupts until a guest vCPU is loaded. The rest have no effect on Xen and it is better to avoid setting them. Signed-off-by: Julien Grall Reviewed-by: Andrii Anisov Reviewed-by: Stefano Stabellini --- Changes in v2: - Fix typo - Add Andrii's and Stefano's reviewed-by --- xen/arch/arm/traps.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c index 221c762ada..64a78d83a5 100644 --- a/xen/arch/arm/traps.c +++ b/xen/arch/arm/traps.c @@ -157,8 +157,12 @@ void init_traps(void) WRITE_SYSREG((HCPTR_CP_MASK & ~(HCPTR_CP(10) | HCPTR_CP(11))) | HCPTR_TTA, CPTR_EL2); - /* Setup hypervisor traps */ - WRITE_SYSREG(get_default_hcr_flags(), HCR_EL2); + /* + * Configure HCR_EL2 with the bare minimum to run Xen until a guest + * is scheduled. {A,I,F}MO bits are set to allow EL2 receiving + * interrupts. + */ + WRITE_SYSREG(HCR_AMO | HCR_FMO | HCR_IMO, HCR_EL2); isb(); }