From: Reto Buerki reet@codelabs.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@codelabs.ch Signed-off-by: Adrian-Ken Rueegsegger ken@codelabs.ch Signed-off-by: Reto Buerki reet@codelabs.ch Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220407110647.67372-1-reet@codelabs.ch Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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