diff options
| author | Quentin Perret <qperret@google.com> | 2022-11-10 19:02:47 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-11-11 17:16:25 +0000 |
| commit | aa6948f82f0b7060fbbac21911dc7996b144ba3c (patch) | |
| tree | 6d16f6fd3b93bdd14027b47005ee913926834f45 /arch/arm64/kvm/hyp/nvhe/mem_protect.c | |
| parent | 9d0c063a4d1d10ef8e6288899b8524413e40cfa0 (diff) | |
KVM: arm64: Add per-cpu fixmap infrastructure at EL2
Mapping pages in a guest page-table from within the pKVM hypervisor at
EL2 may require cache maintenance to ensure that the initialised page
contents is visible even to non-cacheable (e.g. MMU-off) accesses from
the guest.
In preparation for performing this maintenance at EL2, introduce a
per-vCPU fixmap which allows the pKVM hypervisor to map guest pages
temporarily into its stage-1 page-table for the purposes of cache
maintenance and, in future, poisoning on the reclaim path. The use of a
fixmap avoids the need for memory allocation or locking on the map()
path.
Tested-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Co-developed-by: Will Deacon <will@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221110190259.26861-15-will@kernel.org
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/mem_protect.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/mem_protect.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c index 459957b3082e..8b4d3f0aa7a0 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -21,7 +21,6 @@ #define KVM_HOST_S2_FLAGS (KVM_PGTABLE_S2_NOFWB | KVM_PGTABLE_S2_IDMAP) -extern unsigned long hyp_nr_cpus; struct host_mmu host_mmu; static struct hyp_pool host_s2_pool; |