linux-kernel - [PATCH 5.16 242/285] x86/msi: Fix msi message data shadow struct

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Message-Id: <20220412062950.647425068@linuxfoundation.org>
Date:   Tue, 12 Apr 2022 08:31:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Adrian-Ken Rueegsegger <ken@...elabs.ch>,
        Reto Buerki <reet@...elabs.ch>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 5.16 242/285] x86/msi: Fix msi message data shadow struct

From: Reto Buerki <reet@...elabs.ch>

commit 59b18a1e65b7a2134814106d0860010e10babe18 upstream.

The x86 MSI message data is 32 bits in total and is either in
compatibility or remappable format, see Intel Virtualization Technology
for Directed I/O, section 5.1.2.

Fixes: 6285aa50736 ("x86/msi: Provide msi message shadow structs")
Co-developed-by: Adrian-Ken Rueegsegger <ken@...elabs.ch>
Signed-off-by: Adrian-Ken Rueegsegger <ken@...elabs.ch>
Signed-off-by: Reto Buerki <reet@...elabs.ch>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20220407110647.67372-1-reet@codelabs.ch
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/include/asm/msi.h |   19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

--- a/arch/x86/include/asm/msi.h
+++ b/arch/x86/include/asm/msi.h
@@ -12,14 +12,17 @@ int pci_msi_prepare(struct irq_domain *d
 /* Structs and defines for the X86 specific MSI message format */
 
 typedef struct x86_msi_data {
-	u32	vector			:  8,
-		delivery_mode		:  3,
-		dest_mode_logical	:  1,
-		reserved		:  2,
-		active_low		:  1,
-		is_level		:  1;
-
-	u32	dmar_subhandle;
+	union {
+		struct {
+			u32	vector			:  8,
+				delivery_mode		:  3,
+				dest_mode_logical	:  1,
+				reserved		:  2,
+				active_low		:  1,
+				is_level		:  1;
+		};
+		u32	dmar_subhandle;
+	};
 } __attribute__ ((packed)) arch_msi_msg_data_t;
 #define arch_msi_msg_data	x86_msi_data