Wu Zhou a9860fad05 hv: bugfix: skip invalid ffs64 return value ... ffs64() returns INVALID_BIT_INDEX (0xffffU) when it tries to deal with zero input value. This may happen In calculate_logical_dest_mask() when the guest tries to write some illegal destination IDs to MSI config registers of a pt-device. The ffs64() return value is used as per_cpu array index, and it would cause a page fault. This patch adds protection to the per_cpu array, making this function return zero on illegal value. As in logical destination's definition, a zero logical designation would point to no CPU. Fixes: 1334349f8 Tracked-On: #8454 Signed-off-by: Wu Zhou <wu.zhou@intel.com> Reviewed-by: Junjie Mao <junjie.mao@intel.com>		2023-07-14 17:05:17 +08:00
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x86	hv: bugfix: skip invalid ffs64 return value	2023-07-14 17:05:17 +08:00