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ANDROID: KVM: arm64: Add mapping removal interface for nVHE hyp

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The new pkvm_remove_mappings() allows the caller to unmap a memory range
from the hypervisor.

This is to allow later introduction of in-hypervisor tracing.

Bug: 244543039
Bug: 229972309
Change-Id: I9edc7c2ae55c4b7f5d464d26ce3351b5fd4bf9f3
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
This commit is contained in:
Vincent Donnefort 2022-06-27 14:03:28 +01:00 committed by Quentin Perret
parent d996511e43
commit 8a3e189fbd
2 changed files with 10 additions and 0 deletions
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1
arch/arm64/kvm/hyp/include/nvhe/mm.h
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@ -28,5 +28,6 @@ int __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
enum kvm_pgtable_prot prot,
unsigned long *haddr);
int pkvm_alloc_private_va_range(size_t size, unsigned long *haddr);
void pkvm_remove_mappings(void *from, void *to);
#endif /* __KVM_HYP_MM_H */

9
arch/arm64/kvm/hyp/nvhe/mm.c
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@ -136,6 +136,15 @@ int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot)
return ret;
}
void pkvm_remove_mappings(void *from, void *to)
{
unsigned long size = (unsigned long)to - (unsigned long)from;
hyp_spin_lock(&pkvm_pgd_lock);
WARN_ON(kvm_pgtable_hyp_unmap(&pkvm_pgtable, (u64)from, size) != size);
hyp_spin_unlock(&pkvm_pgd_lock);
}
int hyp_back_vmemmap(phys_addr_t back)
{
unsigned long i, start, size, end = 0;