linux-kernel - [PATCH v7 01/10] iommu: Add DOMAIN_ATTR_MSI

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: <1461084994-2355-2-git-send-email-eric.auger@linaro.org>
Date:	Tue, 19 Apr 2016 16:56:25 +0000
From:	Eric Auger <eric.auger@...aro.org>
To:	eric.auger@...com, eric.auger@...aro.org, robin.murphy@....com,
	alex.williamson@...hat.com, will.deacon@....com, joro@...tes.org,
	tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com,
	christoffer.dall@...aro.org, linux-arm-kernel@...ts.infradead.org
Cc:	patches@...aro.org, linux-kernel@...r.kernel.org,
	Bharat.Bhushan@...escale.com, pranav.sawargaonkar@...il.com,
	p.fedin@...sung.com, iommu@...ts.linux-foundation.org,
	Jean-Philippe.Brucker@....com, julien.grall@....com
Subject: [PATCH v7 01/10] iommu: Add DOMAIN_ATTR_MSI_MAPPING attribute

Introduce a new DOMAIN_ATTR_MSI_MAPPING domain attribute. If supported,
this means the MSI addresses need to be mapped in the IOMMU.

x86 IOMMUs typically don't expose the attribute since on x86, MSI write
transaction addresses always are within the 1MB PA region [FEE0_0000h -
FEF0_000h] window which directly targets the APIC configuration space and
hence bypass the sMMU. On ARM and PowerPC however MSI transactions are
conveyed through the IOMMU.

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@...escale.com>
Signed-off-by: Eric Auger <eric.auger@...aro.org>

---

v4 -> v5:
- introduce the user in the next patch

RFC v1 -> v1:
- the data field is not used
- for this attribute domain_get_attr simply returns 0 if the MSI_MAPPING
  capability if needed or <0 if not.
- removed struct iommu_domain_msi_maps
---
 include/linux/iommu.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 62a5eae..b3e8c5b 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -113,6 +113,7 @@ enum iommu_attr {
 	DOMAIN_ATTR_FSL_PAMU_ENABLE,
 	DOMAIN_ATTR_FSL_PAMUV1,
 	DOMAIN_ATTR_NESTING,	/* two stages of translation */
+	DOMAIN_ATTR_MSI_MAPPING, /* Require MSIs mapping in iommu */
 	DOMAIN_ATTR_MAX,
 };
 
-- 
1.9.1