| Message ID | 20210719104735.3681732-13-qperret@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Track shared pages at EL2 in protected mode | expand |
Hi Quentin, On Mon, Jul 19, 2021 at 11:48 AM Quentin Perret <qperret@google.com> wrote: > > Refactor the hypervisor stage-1 locking in nVHE protected mode to expose > a new pkvm_create_mappings_locked() function. This will be used in later > patches to allow walking and changing the hypervisor stage-1 without > releasing the lock. > > Signed-off-by: Quentin Perret <qperret@google.com> > --- > arch/arm64/kvm/hyp/include/nvhe/mm.h | 1 + > arch/arm64/kvm/hyp/nvhe/mm.c | 16 ++++++++++++++-- > 2 files changed, 15 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kvm/hyp/include/nvhe/mm.h b/arch/arm64/kvm/hyp/include/nvhe/mm.h > index 8ec3a5a7744b..c76d7136ed9b 100644 > --- a/arch/arm64/kvm/hyp/include/nvhe/mm.h > +++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h > @@ -23,6 +23,7 @@ int hyp_map_vectors(void); > int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back); > int pkvm_cpu_set_vector(enum arm64_hyp_spectre_vector slot); > int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot); > +int pkvm_create_mappings_locked(void *from, void *to, enum kvm_pgtable_prot prot); > int __pkvm_create_mappings(unsigned long start, unsigned long size, > unsigned long phys, enum kvm_pgtable_prot prot); > unsigned long __pkvm_create_private_mapping(phys_addr_t phys, size_t size, The locking logic seems to be consistent, with pkvm_create_mappings() holding the lock for the whole duration of the operation rather than per-iteration. It would be nice though to document which lock should be held for the _locked versions. Thanks, /fuad > diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c > index a8efdf0f9003..dde22e2a322a 100644 > --- a/arch/arm64/kvm/hyp/nvhe/mm.c > +++ b/arch/arm64/kvm/hyp/nvhe/mm.c > @@ -67,7 +67,7 @@ unsigned long __pkvm_create_private_mapping(phys_addr_t phys, size_t size, > return addr; > } > > -int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot) > +int pkvm_create_mappings_locked(void *from, void *to, enum kvm_pgtable_prot prot) > { > unsigned long start = (unsigned long)from; > unsigned long end = (unsigned long)to; > @@ -81,7 +81,8 @@ int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot) > int err; > > phys = hyp_virt_to_phys((void *)virt_addr); > - err = __pkvm_create_mappings(virt_addr, PAGE_SIZE, phys, prot); > + err = kvm_pgtable_hyp_map(&pkvm_pgtable, virt_addr, PAGE_SIZE, > + phys, prot); > if (err) > return err; > } > @@ -89,6 +90,17 @@ int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot) > return 0; > } > > +int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot) > +{ > + int ret; > + > + hyp_spin_lock(&pkvm_pgd_lock); > + ret = pkvm_create_mappings_locked(from, to, prot); > + hyp_spin_unlock(&pkvm_pgd_lock); > + > + return ret; > +} > + > int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back) > { > unsigned long start, end; > -- > 2.32.0.402.g57bb445576-goog >
diff --git a/arch/arm64/kvm/hyp/include/nvhe/mm.h b/arch/arm64/kvm/hyp/include/nvhe/mm.h index 8ec3a5a7744b..c76d7136ed9b 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mm.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h @@ -23,6 +23,7 @@ int hyp_map_vectors(void); int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back); int pkvm_cpu_set_vector(enum arm64_hyp_spectre_vector slot); int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot); +int pkvm_create_mappings_locked(void *from, void *to, enum kvm_pgtable_prot prot); int __pkvm_create_mappings(unsigned long start, unsigned long size, unsigned long phys, enum kvm_pgtable_prot prot); unsigned long __pkvm_create_private_mapping(phys_addr_t phys, size_t size, diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c index a8efdf0f9003..dde22e2a322a 100644 --- a/arch/arm64/kvm/hyp/nvhe/mm.c +++ b/arch/arm64/kvm/hyp/nvhe/mm.c @@ -67,7 +67,7 @@ unsigned long __pkvm_create_private_mapping(phys_addr_t phys, size_t size, return addr; } -int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot) +int pkvm_create_mappings_locked(void *from, void *to, enum kvm_pgtable_prot prot) { unsigned long start = (unsigned long)from; unsigned long end = (unsigned long)to; @@ -81,7 +81,8 @@ int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot) int err; phys = hyp_virt_to_phys((void *)virt_addr); - err = __pkvm_create_mappings(virt_addr, PAGE_SIZE, phys, prot); + err = kvm_pgtable_hyp_map(&pkvm_pgtable, virt_addr, PAGE_SIZE, + phys, prot); if (err) return err; } @@ -89,6 +90,17 @@ int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot) return 0; } +int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot) +{ + int ret; + + hyp_spin_lock(&pkvm_pgd_lock); + ret = pkvm_create_mappings_locked(from, to, prot); + hyp_spin_unlock(&pkvm_pgd_lock); + + return ret; +} + int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back) { unsigned long start, end;
Refactor the hypervisor stage-1 locking in nVHE protected mode to expose a new pkvm_create_mappings_locked() function. This will be used in later patches to allow walking and changing the hypervisor stage-1 without releasing the lock. Signed-off-by: Quentin Perret <qperret@google.com> --- arch/arm64/kvm/hyp/include/nvhe/mm.h | 1 + arch/arm64/kvm/hyp/nvhe/mm.c | 16 ++++++++++++++-- 2 files changed, 15 insertions(+), 2 deletions(-)