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1eee4ef38c
point in the return-to-userspace path, otherwise memory accesses after the VERW execution could cause data to land in CPU buffers again -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEzv7L6UO9uDPlPSfHEsHwGGHeVUoFAmXbG7IACgkQEsHwGGHe VUoEEg//d1qt/PEWCC23wMO6gLMl4J/e4ZQAuGOKGed/jUmOaQKpHJmpDMRc0li5 llRYDdfE0ikmtQT3t9vQDs3xbWfT5bLMsijliRimb193FaS1HGlHMMS1nxhfjyfv MecbWfkwzX2JnrxJpsbfue+7kks3HyIXYsXV7kSFiHavk4F3GFQXYLO11pKbNQwN 9UfjJDeVsrcWPGCHhoPKF5NHUnQKIA8ZC6g8yBq894AtdWOhFY7ePKBZefUWQQ1n myc5GJ3dKFICMCZvkMABtHYCmHU/W3y/6tPtnrz3kT8GdCIAHG+K9VRUfY1ml94H x327GoM3sEzHLsPizKy00/Uao+j6FOtv631LoDLsO2MF3sHoTZDaSgg5y2D/ZC7t IZdK3mUGtdINRhGiWWpdxyaMfkQ62cdZk8FkeYkRAewYS6WYSdMX3cPqFNy4Ss5u r3reMOD3JcxAatcqhHMXjARMfY+N08gQBpxBul3ejgH8t8aY7xJx6Vggty5kBlHZ 7urV9jIRxSXfbBmOcYu6HP1ucFLWNSUQCBn7Imrh+5zbE1XVv7NaAWvT4Nmgb0/X 57fHoYYSVwaJ0k3zWWM7QYEdcuJ7IZnVgTCQYx26Ec2AOQRxE9ose+awTLYtTbp1 T+XaOlItHKMRzx9K46D7xHwmC5qiokFki3exp5vfGZxGyT3+t/c= =n5us -----END PGP SIGNATURE----- Merge tag 'x86_urgent_for_v6.8_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fixes from Borislav Petkov: - Make sure clearing CPU buffers using VERW happens at the latest possible point in the return-to-userspace path, otherwise memory accesses after the VERW execution could cause data to land in CPU buffers again * tag 'x86_urgent_for_v6.8_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: KVM/VMX: Move VERW closer to VMentry for MDS mitigation KVM/VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key x86/entry_32: Add VERW just before userspace transition x86/entry_64: Add VERW just before userspace transition x86/bugs: Add asm helpers for executing VERW