Description: drm/i915/gen9: Clear residual context state on context switch
References:
 https://github.com/HE-Wenjian/iGPU-Leak
Notes:
Bugs:
upstream: released (5.5-rc7) [bc8a76a152c5f9ef3b48104154a65a68a8b76946]
4.19-upstream-stable: released (4.19.96) [dd4f3b3508f65fe37975db223365216316da3998]
4.9-upstream-stable: released (4.9.210) [571233331e1910206ec365ac61e5b51e77cce3b9]
3.16-upstream-stable: N/A "Driver doesn't support this hardware"
sid: released (5.4.13-1)
4.19-buster-security: released (4.19.98-1)
4.9-stretch-security: released (4.9.210-1)
3.16-jessie-security: N/A "Driver doesn't support this hardware"