refs/heads/willdeacon/el2-pgt-wip - linux

commit: c89417227141ff08fe73247f1b536ae2d8ecba5b
[log]
author: Will Deacon <will@kernel.org>
Mon Apr 11 14:22:33 2022 +0100
committer: Will Deacon <willdeacon@google.com>
Thu Sep 26 16:11:14 2024 +0100
tree: 8dbf0707fa5394b7aa8257c41359c2fb88c328af
parent: 6f1c31ed282f10e5974214c838b870108eded1c9 [diff]

KVM: arm64: Handle guest stage-2 page-tables entirely at EL2

Now that EL2 is able to manage guest stage-2 page-tables, avoid
allocating a separate MMU structure in the host and instead introduce a
new fault handler which responds to guest stage-2 faults by sharing
GUP-pinned pages with the guest via a hypercall. These pages are
recovered (and unpinned) on guest teardown via the page reclaim
hypercall.

Signed-off-by: Will Deacon <will@kernel.org>

arch/arm64/include/asm/kvm_asm.h[diff]
arch/arm64/include/asm/kvm_host.h[diff]
arch/arm64/kvm/arm.c[diff]
arch/arm64/kvm/hyp/nvhe/hyp-main.c[diff]
arch/arm64/kvm/hyp/nvhe/pkvm.c[diff]
arch/arm64/kvm/mmu.c[diff]
arch/arm64/kvm/pkvm.c[diff]

7 files changed

tree: 8dbf0707fa5394b7aa8257c41359c2fb88c328af