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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:30:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:30:21 -0700
commit8b4d37db9a566deaf22065ba1ba9b19c9fb964b4 (patch)
treeab77206e602ab244f667ea6a57199d2facc47cd9 /arch/s390/pci/pci_mmio.c
parentabfbb29297c27e3f101f348dc9e467b0fe70f919 (diff)
parent3798cc4d106e91382bfe016caa2edada27c2bb3f (diff)
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Merge branch 'x86/srbds' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 srbds fixes from Thomas Gleixner: "The 9th episode of the dime novel "The performance killer" with the subtitle "Slow Randomizing Boosts Denial of Service". SRBDS is an MDS-like speculative side channel that can leak bits from the random number generator (RNG) across cores and threads. New microcode serializes the processor access during the execution of RDRAND and RDSEED. This ensures that the shared buffer is overwritten before it is released for reuse. This is equivalent to a full bus lock, which means that many threads running the RNG instructions in parallel have the same effect as the same amount of threads issuing a locked instruction targeting an address which requires locking of two cachelines at once. The mitigation support comes with the usual pile of unpleasant ingredients: - command line options - sysfs file - microcode checks - a list of vulnerable CPUs identified by model and stepping this time which requires stepping match support for the cpu match logic. - the inevitable slowdown of affected CPUs" * branch 'x86/srbds' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/speculation: Add Ivy Bridge to affected list x86/speculation: Add SRBDS vulnerability and mitigation documentation x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation x86/cpu: Add 'table' argument to cpu_matches()
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