linux-kernel - [PATCH AUTOSEL 6.10 107/197] iommu/vt-d: Always reserve a domain ID for identity setup

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Message-ID: <20240925115823.1303019-107-sashal@kernel.org>
Date: Wed, 25 Sep 2024 07:52:06 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Lu Baolu <baolu.lu@...ux.intel.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Jerry Snitselaar <jsnitsel@...hat.com>,
	Joerg Roedel <jroedel@...e.de>,
	Sasha Levin <sashal@...nel.org>,
	dwmw2@...radead.org,
	joro@...tes.org,
	will@...nel.org,
	iommu@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.10 107/197] iommu/vt-d: Always reserve a domain ID for identity setup

From: Lu Baolu <baolu.lu@...ux.intel.com>

[ Upstream commit 2c13012e09190174614fd6901857a1b8c199e17d ]

We will use a global static identity domain. Reserve a static domain ID
for it.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@...hat.com>
Link: https://lore.kernel.org/r/20240809055431.36513-4-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iommu/intel/iommu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index e9bea0305c268..eed67326976d3 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1462,10 +1462,10 @@ static int iommu_init_domains(struct intel_iommu *iommu)
 	 * entry for first-level or pass-through translation modes should
 	 * be programmed with a domain id different from those used for
 	 * second-level or nested translation. We reserve a domain id for
-	 * this purpose.
+	 * this purpose. This domain id is also used for identity domain
+	 * in legacy mode.
 	 */
-	if (sm_supported(iommu))
-		set_bit(FLPT_DEFAULT_DID, iommu->domain_ids);
+	set_bit(FLPT_DEFAULT_DID, iommu->domain_ids);
 
 	return 0;
 }
-- 
2.43.0