linux-kernel - [tip: x86/mm] x86/mm/iommu/sva: Fix error code for LAM enabling failure due to SVA

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Message-ID: <168081458969.404.10805285525053802154.tip-bot2@tip-bot2>
Date:   Thu, 06 Apr 2023 20:56:29 -0000
From:   "tip-bot2 for Kirill A. Shutemov" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/mm] x86/mm/iommu/sva: Fix error code for LAM enabling
 failure due to SVA

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     fca1fdd2b0a6fcd491ec520afac80bc72b4c811e
Gitweb:        https://git.kernel.org/tip/fca1fdd2b0a6fcd491ec520afac80bc72b4c811e
Author:        Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
AuthorDate:    Mon, 03 Apr 2023 14:10:19 +03:00
Committer:     Dave Hansen <dave.hansen@...ux.intel.com>
CommitterDate: Thu, 06 Apr 2023 13:44:58 -07:00

x86/mm/iommu/sva: Fix error code for LAM enabling failure due to SVA

Normally, LAM and SVA are mutually exclusive. LAM enabling will fail if
SVA is already in use.

Correct error code for the failure. EINTR is nonsensical there.

Fixes: 23e5d9ec2bab ("x86/mm/iommu/sva: Make LAM and SVA mutually exclusive")
Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
Link: https://lore.kernel.org/all/CACT4Y+YfqSMsZArhh25TESmG-U4jO5Hjphz87wKSnTiaw2Wrfw@mail.gmail.com
Link: https://lore.kernel.org/all/20230403111020.3136-2-kirill.shutemov%40linux.intel.com
---
 arch/x86/kernel/process_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index b46924c..bc2ac56 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -758,7 +758,7 @@ static int prctl_enable_tagged_addr(struct mm_struct *mm, unsigned long nr_bits)
 
 	if (mm_valid_pasid(mm) &&
 	    !test_bit(MM_CONTEXT_FORCE_TAGGED_SVA, &mm->context.flags))
-		return -EINTR;
+		return -EINVAL;
 
 	if (mmap_write_lock_killable(mm))
 		return -EINTR;