diff options
Diffstat (limited to 'arch/x86/kernel/cpu/amd.c')
| -rw-r--r-- | arch/x86/kernel/cpu/amd.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index bca023bdd6b2..d3153e281d72 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -1,5 +1,4 @@ #include <linux/export.h> -#include <linux/init.h> #include <linux/bitops.h> #include <linux/elf.h> #include <linux/mm.h> @@ -487,7 +486,7 @@ static void early_init_amd(struct cpuinfo_x86 *c) set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC); set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC); if (!check_tsc_unstable()) - sched_clock_stable = 1; + set_sched_clock_stable(); } #ifdef CONFIG_X86_64 @@ -508,6 +507,16 @@ static void early_init_amd(struct cpuinfo_x86 *c) set_cpu_cap(c, X86_FEATURE_EXTD_APICID); } #endif + + /* F16h erratum 793, CVE-2013-6885 */ + if (c->x86 == 0x16 && c->x86_model <= 0xf) { + u64 val; + + rdmsrl(MSR_AMD64_LS_CFG, val); + if (!(val & BIT(15))) + wrmsrl(MSR_AMD64_LS_CFG, val | BIT(15)); + } + } static const int amd_erratum_383[]; @@ -790,14 +799,10 @@ static void cpu_detect_tlb_amd(struct cpuinfo_x86 *c) } /* Handle DTLB 2M and 4M sizes, fall back to L1 if L2 is disabled */ - if (!((eax >> 16) & mask)) { - u32 a, b, c, d; - - cpuid(0x80000005, &a, &b, &c, &d); - tlb_lld_2m[ENTRIES] = (a >> 16) & 0xff; - } else { + if (!((eax >> 16) & mask)) + tlb_lld_2m[ENTRIES] = (cpuid_eax(0x80000005) >> 16) & 0xff; + else tlb_lld_2m[ENTRIES] = (eax >> 16) & mask; - } /* a 4M entry uses two 2M entries */ tlb_lld_4m[ENTRIES] = tlb_lld_2m[ENTRIES] >> 1; |