Messages in this thread | | | From | Fabiano Rosas <> | Subject | Re: [PATCH v2 2/2] powerpc/kvm: don't crash on missing rng, and use darn | Date | Fri, 24 Jun 2022 11:44:08 -0300 |
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"Jason A. Donenfeld" <Jason@zx2c4.com> 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@vger.kernel.org # v4.1+ > Cc: Michael Ellerman <mpe@ellerman.id.au> > Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") > Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
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