}
}
+static bool is_amd_k8_pre_npt(void)
+{
+ struct cpuinfo_x86 *c = &boot_cpu_data;
+
+ return unlikely(IS_ENABLED(CONFIG_CPU_SUP_AMD) &&
+ c->x86_vendor == X86_VENDOR_AMD &&
+ c->x86 == 0xf && c->x86_model < 0x40);
+}
+
static int
is_prefetch(struct pt_regs *regs, unsigned long error_code, unsigned long addr)
{
unsigned char *instr;
int prefetch = 0;
+ /* Erratum #91 affects AMD K8, pre-NPT CPUs */
+ if (!is_amd_k8_pre_npt())
+ return 0;
+
/*
* If it was a exec (instruction fetch) fault on NX page, then
* do not ignore the fault: