[PATCHv5 11/16] arm64: arm_generic: prevent reading stale time

[PATCHv5 00/16] Unify arm_generic and arch_timer drivers · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 01/16] arm: arch_timer: balance device_node refcounting · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 01/16] arm: arch_timer: balance device_node refcounting · catalin.marinas@arm.com (Catalin Marinas) · 2013-01-31
[PATCHv5 02/16] arm: arch_timer: remove redundant available check · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 03/16] arm: arch_timer: use u64/u32 for register data · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 04/16] arm: arch_timer: standardise counter reading · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 04/16] arm: arch_timer: standardise counter reading · catalin.marinas@arm.com (Catalin Marinas) · 2013-01-31
[PATCHv5 05/16] arm: arch_timer: split cntfrq accessor · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 06/16] arm: arch_timer: factor out register accessors · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 07/16] arm: arch_timer: add isbs to register accessors · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 07/16] arm: arch_timer: add isbs to register accessors · catalin.marinas@arm.com (Catalin Marinas) · 2013-01-31
[PATCHv5 08/16] arm: arch_timer: divorce from local_timer api · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 09/16] arm: arch_timer: add arch_counter_set_user_access · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 09/16] arm: arch_timer: add arch_counter_set_user_access · catalin.marinas@arm.com (Catalin Marinas) · 2013-01-31
[PATCHv5 10/16] arm: arch_timer: move core to drivers/clocksource · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 11/16] arm64: arm_generic: prevent reading stale time · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 11/16] arm64: arm_generic: prevent reading stale time · catalin.marinas@arm.com (Catalin Marinas) · 2013-01-31
[PATCHv5 12/16] arm64: move from arm_generic to arm_arch_timer · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 13/16] Documentation: Add ARMv8 to arch_timer devicetree · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 14/16] ARM: arch_timers: switch to physical timers if HYP mode is available · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 14/16] ARM: arch_timers: switch to physical timers if HYP mode is available · catalin.marinas@arm.com (Catalin Marinas) · 2013-01-31
[PATCHv5 15/16] ARM: hyp: initialize CNTVOFF to zero · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 15/16] ARM: hyp: initialize CNTVOFF to zero · Dave Martin <hidden> · 2013-02-01
[PATCHv5 15/16] ARM: hyp: initialize CNTVOFF to zero · Marc Zyngier <hidden> · 2013-02-01
[PATCHv5 15/16] ARM: hyp: initialize CNTVOFF to zero · mark.rutland@arm.com (Mark Rutland) · 2013-02-01
[PATCHv5 15/16] ARM: hyp: initialize CNTVOFF to zero · Dave Martin <hidden> · 2013-02-01
[PATCHv5 15/16] ARM: hyp: initialize CNTVOFF to zero · mark.rutland@arm.com (Mark Rutland) · 2013-02-04
[PATCHv5 16/16] clocksource: arch_timer: use virtual counters · mark.rutland@arm.com (Mark Rutland) · 2013-01-31
[PATCHv5 16/16] clocksource: arch_timer: use virtual counters · catalin.marinas@arm.com (Catalin Marinas) · 2013-01-31
[PATCHv5 00/16] Unify arm_generic and arch_timer drivers · Stephen Warren <hidden> · 2013-01-31

From: catalin.marinas@arm.com (Catalin Marinas)
Date: 2013-01-31 15:36:47

On Thu, Jan 31, 2013 at 12:15:34PM +0000, Mark Rutland wrote:

Currently arch_counter_get_cnt{p,v}ct can be speculated, allowing for
stale time values to be read. This could be problematic for the delay
loop and other sensitive functions, as the time delta could jump around
unexpectedly.

This patch adds isbs to arch_counter_get_cnt{p,v}ct, preventing this
possibility.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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