"Jason A. Donenfeld" <Jason@xxxxxxxxx> writes: > On POWER8 systems that don't have ibm,power-rng available, a guest that > ignores the KVM_CAP_PPC_HWRNG flag and calls H_RANDOM anyway will > dereference a NULL pointer. And on machines with darn instead of > ibm,power-rng, H_RANDOM won't work at all. > > This patch kills two birds with one stone, by routing H_RANDOM calls to > ppc_md.get_random_seed, and doing the real mode check inside of it. > > Cc: stable@xxxxxxxxxxxxxxx # v4.1+ > Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> > Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") > Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx> Reviewed-by: Fabiano Rosas <farosas@xxxxxxxxxxxxx>