On 09/19/2014 02:42 PM, Andy Lutomirski wrote: > On Fri, Sep 19, 2014 at 11:30 AM, Christopher Covington > <c...@codeaurora.org> wrote: >> On 09/17/2014 10:50 PM, Andy Lutomirski wrote: >>> Hi all- >>> >>> I would like to standardize on a very simple protocol by which a guest >>> OS can obtain an RNG seed early in boot. >>> >>> The main design requirements are: >>> >>> - The interface should be very easy to use. Linux, at least, will >>> want to use it extremely early in boot as part of kernel ASLR. This >>> means that PCI and ACPI will not work. >> >> How do non-virtual systems get entropy this early? RDRAND/Padlock? Truerand? >> Could hypervisors and simulators simply make sure these work? >> > > If RDRAND is available, then Linux, at least, will use it. The rest > are too complicated for early use. Linux on x86 plays some vaguely > clever games with rdtsc and poking at the i8254 port.
I just wanted to check that it couldn't be as simple as giving one or both of the timers random initial values. Christopher -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by the Linux Foundation. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
