diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/cpu/amd.c | 2 | ||||
| -rw-r--r-- | arch/x86_64/kernel/process.c | 8 | ||||
| -rw-r--r-- | arch/x86_64/kernel/setup.c | 4 |
3 files changed, 12 insertions, 2 deletions
diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c index 0810f81f2a05..d2d50cbdcce9 100644 --- a/arch/i386/kernel/cpu/amd.c +++ b/arch/i386/kernel/cpu/amd.c @@ -207,6 +207,8 @@ static void __init init_amd(struct cpuinfo_x86 *c) set_bit(X86_FEATURE_K7, c->x86_capability); break; } + if (c->x86 >= 6) + set_bit(X86_FEATURE_FXSAVE_LEAK, c->x86_capability); display_cacheinfo(c); diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c index 22a05dec81a2..818ab9e66aed 100644 --- a/arch/x86_64/kernel/process.c +++ b/arch/x86_64/kernel/process.c @@ -527,8 +527,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) int cpu = smp_processor_id(); struct tss_struct *tss = &per_cpu(init_tss, cpu); - unlazy_fpu(prev_p); - /* * Reload esp0, LDT and the page table pointer: */ @@ -591,6 +589,12 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) prev->userrsp = read_pda(oldrsp); write_pda(oldrsp, next->userrsp); write_pda(pcurrent, next_p); + + /* This must be here to ensure both math_state_restore() and + kernel_fpu_begin() work consistently. + And the AMD workaround requires it to be after DS reload. */ + unlazy_fpu(prev_p); + write_pda(kernelstack, task_stack_page(next_p) + THREAD_SIZE - PDA_STACKOFFSET); diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index aa55e3cec665..a4a0bb5fb481 100644 --- a/arch/x86_64/kernel/setup.c +++ b/arch/x86_64/kernel/setup.c @@ -909,6 +909,10 @@ static int __init init_amd(struct cpuinfo_x86 *c) if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)) set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability); + /* Enable workaround for FXSAVE leak */ + if (c->x86 >= 6) + set_bit(X86_FEATURE_FXSAVE_LEAK, &c->x86_capability); + r = get_model_name(c); if (!r) { switch (c->x86) { |