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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2021-09-01 18:45:50 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-12-02 22:56:08 +1100 |
| commit | 792020907b11c6f9246c21977cab3bad985ae4b6 (patch) | |
| tree | 50b95a494699b5e9842d2f3b854b4db9c1999b0e /tools/perf/scripts/python/check-perf-trace.py | |
| parent | 511d25d6b789fffcb20a3eb71899cf974a31bd9d (diff) | |
KVM: PPC: Book3S: Suppress failed alloc warning in H_COPY_TOFROM_GUEST
H_COPY_TOFROM_GUEST is an hcall for an upper level VM to access its nested
VMs memory. The userspace can trigger WARN_ON_ONCE(!(gfp & __GFP_NOWARN))
in __alloc_pages() by constructing a tiny VM which only does
H_COPY_TOFROM_GUEST with a too big GPR9 (number of bytes to copy).
This silences the warning by adding __GFP_NOWARN.
Spotted by syzkaller.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210901084550.1658699-1-aik@ozlabs.ru
Diffstat (limited to 'tools/perf/scripts/python/check-perf-trace.py')
0 files changed, 0 insertions, 0 deletions