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| author |   Jason A. Donenfeld <Jason@zx2c4.com> | 2022-06-22 12:54:35 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2022-06-24 17:26:49 +0200 |
| commit | 729697f3cadfa83631bfdcda567ae6fbbcd9d44b (patch) | |
| tree | b49d17b133f59ea5d52a0ee78f360aeb5f58a9eb /fs/btrfs/transaction.c | |
| parent | powerpc/powernv: rename remaining rng powernv_ functions to pnv_ (diff) | |
| download | linux-dev-729697f3cadfa83631bfdcda567ae6fbbcd9d44b.tar.xz linux-dev-729697f3cadfa83631bfdcda567ae6fbbcd9d44b.zip | |
powerpc/kvm: don't crash on missing rng, and use darn
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>
Diffstat (limited to 'fs/btrfs/transaction.c')
0 files changed, 0 insertions, 0 deletions