linux-kernel - Re: [PATCH 0/2] Fix ACS path checking

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

Message-ID: <20120806122053.GL1996@amd.com>
Date:	Mon, 6 Aug 2012 14:20:53 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	<linux-pci@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
	<dwmw2@...radead.org>, <linux-kernel@...r.kernel.org>,
	<dsahern@...il.com>
Subject: Re: [PATCH 0/2] Fix ACS path checking

On Mon, Aug 06, 2012 at 12:50:10PM +0200, Joerg Roedel wrote:
> On Sat, Aug 04, 2012 at 12:08:46PM -0600, Alex Williamson wrote:
> Hmm, tried it here, At least pci_request_acs() still gets called. How do
> you detect if ACS is really enabled?

Okay, I found a problem. pci_request_acs needs to be called before PCI
probing. Does the attached patch help?

>From 87a4363be30d5d015a984a60769f29b0607fc5fb Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joerg.roedel@....com>
Date: Mon, 6 Aug 2012 14:18:42 +0200
Subject: [PATCH] iommu/amd: Fix pci_request_acs() call-place

The pci_request_acs() function needs to be called before PCI
probing to be effective. So move it to another call-place to
ensure that.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 drivers/iommu/amd_iommu_init.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 500e7f1..0a2ea31 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1131,9 +1131,6 @@ static int __init amd_iommu_init_pci(void)
 			break;
 	}
 
-	/* Make sure ACS will be enabled */
-	pci_request_acs();
-
 	ret = amd_iommu_init_devices();
 
 	print_iommu_info();
@@ -1652,6 +1649,9 @@ static bool detect_ivrs(void)
 
 	early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
 
+	/* Make sure ACS will be enabled during PCI probe */
+	pci_request_acs();
+
 	return true;
 }
 
-- 
1.7.9.5


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/