x86/cpu: Add Tremont to the cpu vulnerability whitelist

BugLink: https://bugs.launchpad.net/bugs/1852338
commit cad14885a8d32c1c0d8eaa7bf5c0152a22b6080e upstream.

Add the new cpu family ATOM_TREMONT_D to the cpu vunerability
whitelist. ATOM_TREMONT_D is not affected by X86_BUG_ITLB_MULTIHIT.

ATOM_TREMONT_D might have mitigations against other issues as well, but
only the ITLB multihit mitigation is confirmed at this point.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 23e31493c67f1855cdb51cadd17354e002f8a03e..663b27bdea8805a7aec85cdd628e9099276d8d1b 100644 (file)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1073,6 +1073,8 @@ static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = {
         * good enough for our purposes.
         */
 
+       VULNWL_INTEL(ATOM_TREMONT_X,            NO_ITLB_MULTIHIT),
+
        /* AMD Family 0xf - 0x12 */
        VULNWL_AMD(0x0f,        NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT),
        VULNWL_AMD(0x10,        NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT),