[PATCH 0/6] Move pKVM ownership state to hyp_vmemmap
Quentin Perret
qperret at google.com
Wed Feb 26 16:33:04 PST 2025
Hi all,
This series moves the hypervisor's ownership state to the hyp_vmemmap,
as discussed in [1]. The two main benefits are:
1. much cheaper hyp state lookups, since we can avoid the hyp stage-1
page-table walk;
2. de-correlates the hyp state from the presence of a mapping in the
linear map range of the hypervisor; which enables a bunch of
clean-ups in the existing code and will simplify the introduction of
other features in the future (hyp tracing, ...)
Patch 01 is a self-sufficient cleanup that I found thanks to patch 05.
Patches 02-04 implement the aforementioned migration of the hyp state
to the vmemmap. Patches 05 and 06 are cleanups enabled by that
migration.
Patches based on 6.14-rc4, tested on Qemu.
Thanks!
Quentin
[1] https://lore.kernel.org/kvmarm/Z79ZJVOHtNu6YsVt@google.com/
Fuad Tabba (1):
KVM: arm64: Track SVE state in the hypervisor vcpu structure
Quentin Perret (5):
KVM: arm64: Use 0b11 for encoding PKVM_NOPAGE
KVM: arm64: Introduce {get,set}_host_state() helpers
KVM: arm64: Move hyp state to hyp_vmemmap
KVM: arm64: Defer EL2 stage-1 mapping on share
KVM: arm64: Unconditionally cross check hyp state
arch/arm64/include/asm/kvm_host.h | 12 +--
arch/arm64/kvm/hyp/include/nvhe/memory.h | 35 ++++++--
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 4 -
arch/arm64/kvm/hyp/nvhe/mem_protect.c | 106 ++++++++++++-----------
arch/arm64/kvm/hyp/nvhe/pkvm.c | 54 ++++++++++--
arch/arm64/kvm/hyp/nvhe/setup.c | 10 ++-
6 files changed, 147 insertions(+), 74 deletions(-)
--
2.48.1.658.g4767266eb4-goog
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