forked from luck/tmp_suning_uos_patched
ec10b72701
the cpu state settable by user space. This is necessary to avoid races in s390 SIGP/reset handling which happen because some SIGPs are handled in QEMU, while others are handled in the kernel. Together with the busy conditions as return value of SIGP races happen especially in areas like starting and stopping of CPUs. (For example, there is a program 'cpuplugd', that runs on several s390 distros which does automatic onlining and offlining on cpus.) As soon as the MPSTATE interface is used, user space takes complete control of the cpu states. Otherwise the kernel will use the old way. Therefore, the new kernel continues to work fine with old QEMUs. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJTxSp+AAoJEBF7vIC1phx8RYgP/0mBaV3isXrCR+iisLJYNJjq s6Ssl9TUMR3+lRZ9epytRd02UfkBGqVaW+HtRh5JP5KKAGSn2i3eB9WDAY7bD8i7 DVLVE2aO7okw1Z2G6CEO27dRfS0SCAfj/X77BRISyqVxK4eY86lAhQdyU5nB67TR c0Fk4YHwjeBoQxZTAQr2xL4052gkB+Jp/PpltszILonsYNASOsxbcHqH4t+0SFmo FGXydBn6eN+e3fWQSxetkrxvj14sj5K6ljiZoSMyw5nDfyrRn8RcCX87GjNLG+GR X0eFB9Nl83NQoC5ksQtojunsx57+cEMgoWbdK7mxoqp+6+wJrvYB2eSKY77RYH4J 2xIy3klF/ypSZt7gxwL0pugi9QodGW39mA+stuezKUwyPalpMxHmRRwvHitGJjkP KwvWc4m2QebKJ6RHhgkvZ0gMaVUJcqitrlXUxWgAAcH6MNBIC1g2ufsxnv51V/O6 SnspBWTPVDUqO6bJP4brJiAt8K7Jx3Bg5frpyN0jparh8Nmu3Kwfz0RtDYrUYyOe p2o2lzY5L6gvY3iOrhvoc9zbpbyuycon8nUP4WOh/eGvIM2WV6cxmkck1Fo/wNso evunS1FNvbN7Wxk5h4/XSVsfdcM/mUa3E7cVxgpg8+Aqse9qfpM35BlNWR+zf0G+ AdF90u/I+3mcRKWoSrKu =86qw -----END PGP SIGNATURE----- Merge tag 'kvm-s390-20140715' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kvm-next This series enables the "KVM_(S|G)ET_MP_STATE" ioctls on s390 to make the cpu state settable by user space. This is necessary to avoid races in s390 SIGP/reset handling which happen because some SIGPs are handled in QEMU, while others are handled in the kernel. Together with the busy conditions as return value of SIGP races happen especially in areas like starting and stopping of CPUs. (For example, there is a program 'cpuplugd', that runs on several s390 distros which does automatic onlining and offlining on cpus.) As soon as the MPSTATE interface is used, user space takes complete control of the cpu states. Otherwise the kernel will use the old way. Therefore, the new kernel continues to work fine with old QEMUs. |
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| .. | ||
| devices | ||
| 00-INDEX | ||
| api.txt | ||
| cpuid.txt | ||
| hypercalls.txt | ||
| locking.txt | ||
| mmu.txt | ||
| msr.txt | ||
| nested-vmx.txt | ||
| ppc-pv.txt | ||
| review-checklist.txt | ||
| s390-diag.txt | ||
| timekeeping.txt | ||