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ANDROID: KVM: arm64: Refactor code for reclaiming guest memory into a function

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Tidies up code and enables the reuse of this function.

No functional change intended.

Bug: 232070947
Signed-off-by: Fuad Tabba <tabba@google.com>
Change-Id: I3a93dd0284e3c177b12d0cabf5e99747dceb0fb4
This commit is contained in:
Fuad Tabba
2022-10-10 08:33:23 +01:00
committed by Will Deacon
parent 232bdcbd66
commit 66be6be8fb
1 changed files with 20 additions and 15 deletions
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35
arch/arm64/kvm/hyp/nvhe/pkvm.c
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@@ -738,16 +738,27 @@ err:
return ret; return ret;
} }
static void teardown_donated_memory(struct kvm_hyp_memcache *mc, void *addr,
size_t size)
{
u64 pfn = hyp_phys_to_pfn(__hyp_pa(addr));
u64 nr_pages = size >> PAGE_SHIFT;
void *start;
memset(addr, 0, size);
for (start = addr; start < addr + size; start += PAGE_SIZE)
push_hyp_memcache(mc, start, hyp_virt_to_phys);
WARN_ON(__pkvm_hyp_donate_host(pfn, nr_pages));
}
int __pkvm_teardown_shadow(int shadow_handle) int __pkvm_teardown_shadow(int shadow_handle)
{ {
struct kvm_hyp_memcache *mc; struct kvm_hyp_memcache *mc;
struct kvm_shadow_vm *vm; struct kvm_shadow_vm *vm;
struct kvm *host_kvm; struct kvm *host_kvm;
size_t shadow_size;
int err; int err;
u64 pfn;
u64 nr_pages;
void *addr;
int i; int i;
/* Lookup then remove entry from the shadow table. */ /* Lookup then remove entry from the shadow table. */
@@ -763,6 +774,8 @@ int __pkvm_teardown_shadow(int shadow_handle)
goto err_unlock; goto err_unlock;
} }
host_kvm = vm->host_kvm;
/* /*
* Clear the tracking for last_loaded_vcpu for all cpus for this vm in * Clear the tracking for last_loaded_vcpu for all cpus for this vm in
* case the same addresses for those vcpus are reused for future vms. * case the same addresses for those vcpus are reused for future vms.
@@ -782,22 +795,14 @@ int __pkvm_teardown_shadow(int shadow_handle)
hyp_spin_unlock(&shadow_lock); hyp_spin_unlock(&shadow_lock);
/* Reclaim guest pages, and page-table pages */ /* Reclaim guest pages, and page-table pages */
mc = &vm->host_kvm->arch.pkvm.teardown_mc; mc = &host_kvm->arch.pkvm.teardown_mc;
reclaim_guest_pages(vm, mc); reclaim_guest_pages(vm, mc);
drain_shadow_vcpus(vm->shadow_vcpus, vm->created_vcpus, mc); drain_shadow_vcpus(vm->shadow_vcpus, vm->created_vcpus, mc);
unpin_host_vcpus(vm->shadow_vcpus, vm->created_vcpus); unpin_host_vcpus(vm->shadow_vcpus, vm->created_vcpus);
/* Push the metadata pages to the teardown memcache */ teardown_donated_memory(mc, vm, vm->shadow_area_size);
shadow_size = vm->shadow_area_size;
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)); hyp_unpin_shared_mem(host_kvm, host_kvm + 1);
nr_pages = shadow_size >> PAGE_SHIFT;
WARN_ON(__pkvm_hyp_donate_host(pfn, nr_pages));
return 0; return 0;
err_unlock: err_unlock: