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x86/speculation/mds: Eliminate leaks by trace_hardirqs_on()

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Move mds_idle_clear_cpu_buffers() after trace_hardirqs_on() to ensure
all store buffer entries are flushed.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: bp@alien8.de
Cc: hpa@zytor.com
Cc: jgross@suse.com
Cc: ndesaulniers@google.com
Cc: gregkh@linuxfoundation.org
Link: https://lkml.kernel.org/r/1561260904-29669-2-git-send-email-zhenzhong.duan@oracle.com
This commit is contained in:
Zhenzhong Duan 2019-06-23 11:35:04 +08:00 committed by Thomas Gleixner
parent 4b972a01a7
commit ab3765a050
1 changed files with 2 additions and 2 deletions
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4
arch/x86/include/asm/mwait.h
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@ -86,9 +86,9 @@ static inline void __mwaitx(unsigned long eax, unsigned long ebx,
static inline void __sti_mwait(unsigned long eax, unsigned long ecx) static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
{ {
mds_idle_clear_cpu_buffers();
trace_hardirqs_on(); trace_hardirqs_on();
mds_idle_clear_cpu_buffers();
/* "mwait %eax, %ecx;" */ /* "mwait %eax, %ecx;" */
asm volatile("sti; .byte 0x0f, 0x01, 0xc9;" asm volatile("sti; .byte 0x0f, 0x01, 0xc9;"
:: "a" (eax), "c" (ecx)); :: "a" (eax), "c" (ecx));