diff options
| author | Ingo Molnar <mingo@kernel.org> | 2017-08-31 14:20:06 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-08-31 14:20:06 +0200 |
| commit | 3e83dfd5d8e374328078f527f1f7d189824896ab (patch) | |
| tree | 2f82b2e82f7a4b5c513fed42d4228a8bce938180 /arch/x86/kernel/process.c | |
| parent | 3308376a914b9c3f57a12072c063814403d983a8 (diff) | |
| parent | 9e52fc2b50de3a1c08b44f94c610fbe998c0031a (diff) | |
Merge branch 'x86/mm' into x86/platform, to pick up TLB flush dependency
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/process.c')
| -rw-r--r-- | arch/x86/kernel/process.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 3ca198080ea9..bd6b85fac666 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -355,6 +355,7 @@ bool xen_set_default_idle(void) return ret; } #endif + void stop_this_cpu(void *dummy) { local_irq_disable(); @@ -365,8 +366,20 @@ void stop_this_cpu(void *dummy) disable_local_APIC(); mcheck_cpu_clear(this_cpu_ptr(&cpu_info)); - for (;;) - halt(); + for (;;) { + /* + * Use wbinvd followed by hlt to stop the processor. This + * provides support for kexec on a processor that supports + * SME. With kexec, going from SME inactive to SME active + * requires clearing cache entries so that addresses without + * the encryption bit set don't corrupt the same physical + * address that has the encryption bit set when caches are + * flushed. To achieve this a wbinvd is performed followed by + * a hlt. Even if the processor is not in the kexec/SME + * scenario this only adds a wbinvd to a halting processor. + */ + asm volatile("wbinvd; hlt" : : : "memory"); + } } /* |