On Thu, Oct 05, 2017 at 08:18:05PM +0100, James Morse wrote: > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index b68f5e93baac..29df2a93688c 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -989,6 +989,21 @@ config ARM64_RAS_EXTN > and access the new registers if the system supports the extension. > Platform RAS features may additionally depend on firmware support. > > +config ARM64_IESB > + bool "Enable Implicit Error Synchronization Barrier (IESB)" > + default y > + depends on ARM64_RAS_EXTN > + help > + ARM v8.2 adds a feature to add implicit error synchronization > + barriers whenever the CPU enters or exits a particular exception > + level. > + > + On CPUs with this feature and the 'RAS Extensions' feature, we can > + use this to contain detected (but not yet reported) errors to the > + relevant exception level. > + > + The feature is detected at runtime, selecting this option will > + enable these implicit barriers if the CPU supports the feature. > endmenu What's the use-case for not having this option always enabled? -- Catalin _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
