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KVM: arm64: Expose host stage-2 manipulation helpers

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We will need to manipulate the host stage-2 page-table from outside
mem_protect.c soon. Introduce two functions allowing this, and make
them usable to users of mem_protect.h.

Signed-off-by: Quentin Perret <qperret@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210809152448.1810400-14-qperret@google.com
This commit is contained in:
Quentin Perret 2021-08-09 16:24:40 +01:00 • committed by Marc Zyngier
parent ec250a67ea
commit 39257da0e0
2 changed files with 19 additions and 1 deletions
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2
arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
View file

@ -49,6 +49,8 @@ extern struct host_kvm host_kvm;
int __pkvm_prot_finalize(void);
int __pkvm_mark_hyp(phys_addr_t start, phys_addr_t end);
int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_prot prot);
int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id);
int kvm_host_prepare_stage2(void *pgt_pool_base);
void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt);

18
arch/arm64/kvm/hyp/nvhe/mem_protect.c
View file

@ -273,6 +273,22 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
return 0;
}
int host_stage2_idmap_locked(phys_addr_t addr, u64 size,
enum kvm_pgtable_prot prot)
{
hyp_assert_lock_held(&host_kvm.lock);
return host_stage2_try(__host_stage2_idmap, addr, addr + size, prot);
}
int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id)
{
hyp_assert_lock_held(&host_kvm.lock);
return host_stage2_try(kvm_pgtable_stage2_set_owner, &host_kvm.pgt,
addr, size, &host_s2_pool, owner_id);
}
static bool host_stage2_force_pte_cb(u64 addr, u64 end, enum kvm_pgtable_prot prot)
{
/*
@ -309,7 +325,7 @@ static int host_stage2_idmap(u64 addr)
if (ret)
goto unlock;
ret = host_stage2_try(__host_stage2_idmap, range.start, range.end, prot);
ret = host_stage2_idmap_locked(range.start, range.end - range.start, prot);
unlock:
hyp_spin_unlock(&host_kvm.lock);