On Wed, Jul 23, 2014 at 9:57 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > This introduces and uses a very simple synchronous mechanism to get > /dev/urandom-style bits appropriate for initial KVM PV guest RNG > seeding. > > It also re-works the way that architectural random data is fed into > random.c's pools. I added a new arch hook called arch_get_rng_seed. > The default implementation is more or less the same as the current > code, except that random_get_entropy is now called unconditionally. > > x86 gets a custom arch_get_rng_seed. It will use KVM_GET_RNG_SEED > if available, and, if it does anything, it will log the number of > bits collected from each available architectural source. If more > paravirt seed sources show up, it will be a natural place to add > them. > > I sent the corresponding kvm-unit-tests and qemu changes separately. What's the status of this series? I assume that it's too late for at least patches 2-5 to make it into 3.17. --Andy > > Changes from v4: > - Got rid of the RDRAND behavior change. If this series is accepted, > I may resend it separately, but I think it's an unrelated issue. > - Fix up the changelog entries -- I misunderstood how the old code > worked. > - Avoid lots of failed attempts to use KVM_GET_RNG_SEED if it's not > available. > > Changes from v3: > - Other than KASLR, the guest pieces are completely rewritten. > Patches 2-4 have essentially nothing in common with v2. > > Changes from v2: > - Bisection fix (patch 2 had a misplaced brace). The final states is > identical to that of v2. > - Improve the 0/5 description a little bit. > > Changes from v1: > - Split patches 2 and 3 > - Log all arch sources in init_std_data > - Fix the 32-bit kaslr build > > Andy Lutomirski (5): > x86,kvm: Add MSR_KVM_GET_RNG_SEED and a matching feature bit > random: Add and use arch_get_rng_seed > x86,random: Add an x86 implementation of arch_get_rng_seed > x86,random,kvm: Use KVM_GET_RNG_SEED in arch_get_rng_seed > 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/archrandom.h | 6 +++ > arch/x86/include/asm/kvm_guest.h | 9 +++++ > arch/x86/include/asm/processor.h | 21 ++++++++-- > arch/x86/include/uapi/asm/kvm_para.h | 2 + > arch/x86/kernel/Makefile | 2 + > arch/x86/kernel/archrandom.c | 74 ++++++++++++++++++++++++++++++++++++ > arch/x86/kernel/kvm.c | 10 +++++ > arch/x86/kvm/cpuid.c | 3 +- > arch/x86/kvm/x86.c | 4 ++ > drivers/char/random.c | 14 +++++-- > include/linux/random.h | 40 +++++++++++++++++++ > 14 files changed, 212 insertions(+), 7 deletions(-) > create mode 100644 arch/x86/kernel/archrandom.c > > -- > 1.9.3 > -- Andy Lutomirski AMA Capital Management, LLC -- 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
