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399b2896d4
The spapr_cap SPAPR_CAP_IBS is used to indicate the level of capability for mitigations for indirect branch speculation. Currently the available values are broken (default), fixed-ibs (fixed by serialising indirect branches) and fixed-ccd (fixed by diabling the count cache). Introduce a new value for this capability denoted workaround, meaning that software can work around the issue by flushing the count cache on context switch. This option is available if the hypervisor sets the H_CPU_BEHAV_FLUSH_COUNT_CACHE flag in the cpu behaviours returned from the KVM_PPC_GET_CPU_CHAR ioctl. Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com> Message-Id: <20190301031912.28809-1-sjitindarsingh@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> |
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