[tip:timers/vdso] arm64: compat: Fix __arch_get_hw_counter() implementation

[tip-bot for Vincenzo Frascino]

Commit-ID:  6241c4dc6ec56a7627b972959da8b492b765b209
Gitweb:     https://git.kernel.org/tip/6241c4dc6ec56a7627b972959da8b492b765b209
Author:     Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
AuthorDate: Tue, 25 Jun 2019 17:18:04 +0100
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 26 Jun 2019 14:26:54 +0200

arm64: compat: Fix __arch_get_hw_counter() implementation

Provide the following fixes for the __arch_get_hw_counter()
implementation on arm64:
- Fallback on syscall when an unstable counter is detected.
- Introduce isb()s before and after the counter read to avoid
speculation of the counter value and of the seq lock
respectively.
The second isb() is a temporary solution that will be revisited
in 5.3-rc1.

These fixes restore the semantics that __arch_counter_get_cntvct()
had on arm64.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Cc: catalin.marinas@xxxxxxx
Cc: will.deacon@xxxxxxx
Cc: arnd@xxxxxxxx
Cc: linux@xxxxxxxxxxxxxxx
Cc: ralf@xxxxxxxxxxxxxx
Cc: paul.burton@xxxxxxxx
Cc: daniel.lezcano@xxxxxxxxxx
Cc: salyzyn@xxxxxxxxxxx
Cc: pcc@xxxxxxxxxx
Cc: shuah@xxxxxxxxxx
Cc: 0x7f454c46@xxxxxxxxx
Cc: linux@xxxxxxxxxxxxxxxxxx
Cc: huw@xxxxxxxxxxxxxxx
Cc: sthotton@xxxxxxxxxxx
Cc: andre.przywara@xxxxxxx
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Link: https://lkml.kernel.org/r/20190625161804.38713-3-vincenzo.frascino@xxxxxxx

---
 arch/arm64/include/asm/vdso/compat_gettimeofday.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm64/include/asm/vdso/compat_gettimeofday.h b/arch/arm64/include/asm/vdso/compat_gettimeofday.h
index 93dbd935b66d..f4812777f5c5 100644
--- a/arch/arm64/include/asm/vdso/compat_gettimeofday.h
+++ b/arch/arm64/include/asm/vdso/compat_gettimeofday.h
@@ -12,6 +12,8 @@
 
 #include <asm/vdso/compat_barrier.h>
 
+#define __VDSO_USE_SYSCALL		ULLONG_MAX
+
 #define VDSO_HAS_CLOCK_GETRES		1
 
 static __always_inline
@@ -74,8 +76,24 @@ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
 {
 	u64 res;
 
+	/*
+	 * clock_mode == 0 implies that vDSO are enabled otherwise
+	 * fallback on syscall.
+	 */
+	if (clock_mode)
+		return __VDSO_USE_SYSCALL;
+
+	/*
+	 * This isb() is required to prevent that the counter value
+	 * is speculated.
+	 */
 	isb();
 	asm volatile("mrrc p15, 1, %Q0, %R0, c14" : "=r" (res));
+	/*
+	 * This isb() is required to prevent that the seq lock is
+	 * speculated.
+	 */
+	isb();
 
 	return res;
 }