Messages in this thread | | | Subject | Re: [PATCH 11/18] Hibernate: introduced RSA key-pair to verify signature of snapshot | From | joeyli <> | Date | Thu, 05 Sep 2013 21:28:57 +0800 |
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於 四,2013-09-05 於 11:31 +0100,Matt Fleming 提到: > On Thu, 05 Sep, at 06:13:36PM, joeyli wrote: > > This S4WakeKey is a VOLATILE variable that could not modify by > > SetVariable() at runtime. So, it's read only even through efivars. > > > > Does it what your concern? > > No, the UEFI spec probibits certain runtime functions from being > executed concurrently on separate cpus and the spinlock used in the > efivars code ensures that we adhere to that restriction. See table 31 in > section 7.1 of the UEFI 2.4 spec for the list of services that are > non-reentrant. > > The problem isn't that we want to avoid simultaneous access to > S4WakeKey, it's that we can't invoke any of the variable runtime service > functions concurrently. >
I see! I will use efivar api to access EFI variable.
Thanks a lot! Joey Lee
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