Re: [PATCH v9 00/14] KVM: arm64: Add support for FEAT_TLBIRANGE

On Fri, 11 Aug 2023 04:51:13 +0000, Raghavendra Rao Ananta wrote:

In certain code paths, KVM/ARM currently invalidates the entire VM's
page-tables instead of just invalidating a necessary range. For example,
when collapsing a table PTE to a block PTE, instead of iterating over
each PTE and flushing them, KVM uses 'vmalls12e1is' TLBI operation to
flush all the entries. This is inefficient since the guest would have
to refill the TLBs again, even for the addresses that aren't covered
by the table entry. The performance impact would scale poorly if many
addresses in the VM is going through this remapping.

[...]

Applied to next, thanks!

[01/14] KVM: Rename kvm_arch_flush_remote_tlb() to kvm_arch_flush_remote_tlbs()
        commit: a1342c8027288e345cc5fd16c6800f9d4eb788ed
[02/14] KVM: Declare kvm_arch_flush_remote_tlbs() globally
        commit: cfb0c08e80120928dda1e951718be135abd49bae
[03/14] KVM: arm64: Use kvm_arch_flush_remote_tlbs()
        commit: 32121c813818a87ba7565b3afce93a9cc3610a22
[04/14] KVM: Remove CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
        commit: eddd21481011008792f4e647a5244f6e15970abc
[05/14] KVM: Allow range-based TLB invalidation from common code
        commit: d4788996051e3c07fadc6d9b214073fcf78810a8
[06/14] KVM: Move kvm_arch_flush_remote_tlbs_memslot() to common code
        commit: 619b5072443c05cf18c31b2c0320cdb42396d411
[07/14] arm64: tlb: Refactor the core flush algorithm of __flush_tlb_range
        commit: 360839027a6e4c022e8cbaa373dd747185f1e0a5
[08/14] arm64: tlb: Implement __flush_s2_tlb_range_op()
        commit: 4d73a9c13aaa78b149ac04b02f0ee7973f233bfa
[09/14] KVM: arm64: Implement __kvm_tlb_flush_vmid_range()
        commit: 6354d15052ec88273c24beae4c99e31c3d3889b6
[10/14] KVM: arm64: Define kvm_tlb_flush_vmid_range()
        commit: 117940aa6e5f8308f1529e1313660980f1dae771
[11/14] KVM: arm64: Implement kvm_arch_flush_remote_tlbs_range()
        commit: c42b6f0b1cde4dd19e6b5dd052e67b87cc331b01
[12/14] KVM: arm64: Flush only the memslot after write-protect
        commit: 3756b6f2bb3a242fef0867b39a23607f5aeca138
[13/14] KVM: arm64: Invalidate the table entries upon a range
        commit: defc8cc7abf0fcee8d73e440ee02827348d060e0
[14/14] KVM: arm64: Use TLBI range-based instructions for unmap
        commit: 7657ea920c54218f123ddc1b572821695b669c13

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.



_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel