KVM: arm64: Introduce the EL1 pKVM MMU

Browse source

Introduce a set of helper functions allowing to manipulate the pKVM
guest stage-2 page-tables from EL1 using pKVM's HVC interface.

Each helper has an exact one-to-one correspondance with the traditional
kvm_pgtable_stage2_*() functions from pgtable.c, with a strictly
matching prototype. This will ease plumbing later on in mmu.c.

These callbacks track the gfn->pfn mappings in a simple rb_tree indexed
by IPA in lieu of a page-table. This rb-tree is kept in sync with pKVM's
state and is protected by the mmu_lock like a traditional stage-2
page-table.

Signed-off-by: Quentin Perret <qperret@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20241218194059.3670226-18-qperret@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

...

This commit is contained in:

Quentin Perret 2024-12-18 19:40:58 +00:00 • committed by Marc Zyngier

parent 0adce4d42f

commit e912efed48

4 changed files with 242 additions and 9 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

1

arch/arm64/include/asm/kvm_host.h

View file

21

arch/arm64/include/asm/kvm_pgtable.h

View file

26

arch/arm64/include/asm/kvm_pkvm.h

View file

201

arch/arm64/kvm/pkvm.c

View file