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ANDROID: KVM: arm64: Reclaim vm state pages in teardown memcache

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Push the memory pages used to store VM metadata in the teardown memcache
to let the host know they can be reclaimed.

Signed-off-by: Quentin Perret <qperret@google.com>
Bug: 209580772
Change-Id: Ie3b21c54093509a0cc04141bf4fc2d5feb126668
Signed-off-by: Will Deacon <willdeacon@google.com>
This commit is contained in:
Quentin Perret
2021-11-03 16:07:06 +00:00
committed by Will Deacon
parent ea8ad30e3a
commit 4fc088eb4d
1 changed files with 12 additions and 4 deletions
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16
arch/arm64/kvm/hyp/nvhe/pkvm.c
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@@ -588,11 +588,14 @@ err:
int __pkvm_teardown_shadow(struct kvm *kvm)
{
struct kvm_hyp_memcache *mc;
struct kvm_shadow_vm *vm;
struct kvm *host_kvm;
size_t shadow_size;
int shadow_handle;
u64 pfn;
u64 nr_pages;
void *addr;
kvm = kern_hyp_va(kvm);
@@ -605,13 +608,18 @@ int __pkvm_teardown_shadow(struct kvm *kvm)
shadow_size = vm->shadow_area_size;
reclaim_guest_pages(vm, &vm->host_kvm->arch.pkvm.teardown_mc);
unpin_host_vcpus(vm);
hyp_unpin_shared_mem(vm->host_kvm, vm->host_kvm + 1);
/* Reclaim guest pages, and page-table pages */
mc = &vm->host_kvm->arch.pkvm.teardown_mc;
reclaim_guest_pages(vm, mc);
remove_shadow_table(shadow_handle);
unpin_host_vcpus(vm);
/* Clear the shadow memory since hyp is releasing it back to host. */
/* Push the metadata pages to the teardown memcache */
host_kvm = vm->host_kvm;
memset(vm, 0, shadow_size);
for (addr = vm; addr < ((void *)vm + shadow_size); addr += PAGE_SIZE)
push_hyp_memcache(mc, addr, hyp_virt_to_phys);
hyp_unpin_shared_mem(host_kvm, host_kvm + 1);
pfn = hyp_phys_to_pfn(__hyp_pa(vm));
nr_pages = shadow_size >> PAGE_SHIFT;