On Tue, Jul 15, 2014 at 07:48:06PM -0700, Andy Lutomirski wrote: > virtio-rng is both too complicated and insufficient for initial rng > seeding. It's far too complicated to use for KASLR or any other > early boot random number needs. It also provides /dev/random-style > bits, which means that making guest boot wait for virtio-rng is > unacceptably slow, and doing it asynchronously means that > /dev/urandom might be predictable when userspace starts. > > This introduces a very simple synchronous mechanism to get > /dev/urandom-style bits. Why can't you use RDRAND instruction for that? > > This is a KVM change: am I supposed to write a unit test somewhere? > > Andy Lutomirski (4): > x86,kvm: Add MSR_KVM_GET_RNG_SEED and a matching feature bit > random,x86: Add arch_get_slow_rng_u64 > random: Seed pools from arch_get_slow_rng_u64 at startup > x86,kaslr: Use MSR_KVM_GET_RNG_SEED for KASLR if available > > Documentation/virtual/kvm/cpuid.txt | 3 +++ > arch/x86/Kconfig | 4 ++++ > arch/x86/boot/compressed/aslr.c | 27 +++++++++++++++++++++++++++ > arch/x86/include/asm/archslowrng.h | 30 ++++++++++++++++++++++++++++++ > arch/x86/include/uapi/asm/kvm_para.h | 2 ++ > arch/x86/kernel/kvm.c | 22 ++++++++++++++++++++++ > arch/x86/kvm/cpuid.c | 3 ++- > arch/x86/kvm/x86.c | 4 ++++ > drivers/char/random.c | 14 +++++++++++++- > include/linux/random.h | 9 +++++++++ > 10 files changed, 116 insertions(+), 2 deletions(-) > create mode 100644 arch/x86/include/asm/archslowrng.h > > -- > 1.9.3 > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
