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f55ce5a6cd
Introduce a new KVM capability to expose to the userspace whether cacheable mapping of PFNMAP is supported. The ability to safely do the cacheable mapping of PFNMAP is contingent on S2FWB and ARM64_HAS_CACHE_DIC. S2FWB allows KVM to avoid flushing the D cache, ARM64_HAS_CACHE_DIC allows KVM to avoid flushing the icache and turns icache_inval_pou() into a NOP. The cap would be false if those requirements are missing and is checked by making use of kvm_arch_supports_cacheable_pfnmap. This capability would allow userspace to discover the support. It could for instance be used by userspace to prevent live-migration across FWB and non-FWB hosts. CC: Catalin Marinas <catalin.marinas@arm.com> CC: Jason Gunthorpe <jgg@nvidia.com> CC: Oliver Upton <oliver.upton@linux.dev> CC: David Hildenbrand <david@redhat.com> Suggested-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Tested-by: Donald Dutile <ddutile@redhat.com> Signed-off-by: Ankit Agrawal <ankita@nvidia.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20250705071717.5062-7-ankita@nvidia.com Signed-off-by: Oliver Upton <oliver.upton@linux.dev> |
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| asm-generic | ||
| cxl | ||
| drm | ||
| fwctl | ||
| linux | ||
| misc | ||
| mtd | ||
| rdma | ||
| regulator | ||
| scsi | ||
| sound | ||
| video | ||
| xen | ||
| Kbuild | ||