x86/resctrl: Add vendor check for the MBA software controller

MBA software controller support is available only on Intel.

Suggested-by: Fenghua Yu <[email protected]>
Signed-off-by: Babu Moger <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Brijesh Singh <[email protected]>
Cc: "Chang S. Bae" <[email protected]>
Cc: David Miller <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Dmitry Safonov <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Kate Stewart <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Philippe Ombredanne <[email protected]>
Cc: Pu Wen <[email protected]>
Cc: <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Reinette Chatre <[email protected]>
Cc: Rian Hunter <[email protected]>
Cc: Sherry Hurwitz <[email protected]>
Cc: Suravee Suthikulpanit <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Thomas Lendacky <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Vitaly Kuznetsov <[email protected]>
Cc: <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cf159095b612..fada488069cb 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1878,7 +1878,10 @@ static int parse_rdtgroupfs_options(char *data)
 			if (ret)
 				goto out;
 		} else if (!strcmp(token, "mba_MBps")) {
-			ret = set_mba_sc(true);
+			if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+				ret = set_mba_sc(true);
+			else
+				ret = -EINVAL;
 			if (ret)
 				goto out;
 		} else {