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7b8529e70a
Rename guest_memfd's invalidate() hook to reclaim() and isolate it via its own RECLAIM Kconfig, as the hook is called when a folio is freed, which is far too late and lacks sufficient information for KVM to actually invalidate its usage of the memory. E.g. SNP uses the hook to convert memory back to SHARED so that it can be safely accessed by the host, there is no invalidation of guest mappings anywhere. Isolating the hook will also allow pKVM on arm64 to opt-in to reclaim() without also having to differentiate between reclaim and conversions to shared for active VMs. Keep guest_memfd's trampoline, even though it would be trivial to wire up .free_folio() directly to an arch callback, to avoid bleeding guest_memfd internals into arch code (specifically, avoid referencing folios in arch code). Leave the kvm_x86_ops hook as-is for the moment, as "reclaim" on SNP is the same as convert-to-shared, i.e. using a different name for the x86 hook will allow reusing it for in-place conversion. Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com> Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev> Reviewed-by: Ackerley Tng <ackerleytng@google.com> Link: https://patch.msgid.link/20260723210811.72720-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> |
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| clocksource | ||
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| cxl | ||
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| dt-bindings | ||
| hyperv | ||
| keys | ||
| kunit | ||
| kvm | ||
| linux | ||
| math-emu | ||
| media | ||
| memory | ||
| misc | ||
| net | ||
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| ras | ||
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| rv | ||
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| soc | ||
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| target | ||
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| uapi | ||
| ufs | ||
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| video | ||
| xen | ||
| Kbuild | ||