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authorJason A. Donenfeld <Jason@zx2c4.com>2022-06-22 12:54:35 +0200
committerJason A. Donenfeld <Jason@zx2c4.com>2022-07-19 19:37:50 +0200
commit850190e5d421544fdf95652be2b4575d45fd4298 (patch)
tree1c26298f7a009e3319b9e7d06e35a237d08fbb50 /arch/powerpc/platforms/cell/spufs/inode.c
parentpowerpc/powernv: rename remaining rng powernv_ functions to pnv_ (diff)
downloadlinux-dev-850190e5d421544fdf95652be2b4575d45fd4298.tar.xz
linux-dev-850190e5d421544fdf95652be2b4575d45fd4298.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> Tested-by: Sachin Sant <sachinp@linux.ibm.com> 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 'arch/powerpc/platforms/cell/spufs/inode.c')
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