linux-kernel - [PATCH] iommu/amd: Fix "Guest Virtual APIC Table Root Pointer" configuration in IRTE

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Message-ID: <20230331061723.10337-1-kvijayab@amd.com>
Date:   Fri, 31 Mar 2023 06:17:23 +0000
From:   Kishon Vijay Abraham I <kvijayab@....com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "Robin Murphy" <robin.murphy@....com>
CC:     Kishon Vijay Abraham I <kvijayab@....com>,
        Vasant Hegde <vasant.hegde@....com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Santosh Shukla <santosh.shukla@....com>,
        "Nikunj A . Dadhania" <nikunj@....com>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] iommu/amd: Fix "Guest Virtual APIC Table Root Pointer" configuration in IRTE

commit b9c6ff94e43a ("iommu/amd: Re-factor guest virtual APIC
(de-)activation code") while refactoring guest virtual APIC
activation/de-activation code, stored information for activate/de-activate
in "struct amd_ir_data". It used 32-bit integer data type for storing the
"Guest Virtual APIC Table Root Pointer" (ga_root_ptr), though the
"ga_root_ptr" is actually a 40-bit field in IRTE (Interrupt Remapping
Table Entry).

This causes interrupts from PCIe devices to not reach the guest in the case
of PCIe passthrough with SME (Secure Memory Encryption) enabled as _SME_
bit in the "ga_root_ptr" is lost before writing it to the IRTE.

Fix it by using 64-bit data type for storing the "ga_root_ptr".

Fixes: b9c6ff94e43a ("iommu/amd: Re-factor guest virtual APIC (de-)activation code")
Cc: stable@...r.kernel.org # v5.4+
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Signed-off-by: Kishon Vijay Abraham I <kvijayab@....com>
---
 drivers/iommu/amd/amd_iommu_types.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 3d684190b4d5..990614b8a1fe 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -1001,7 +1001,7 @@ struct amd_ir_data {
 	 */
 	struct irq_cfg *cfg;
 	int ga_vector;
-	int ga_root_ptr;
+	u64 ga_root_ptr;
 	int ga_tag;
 };

-- 
2.34.1