shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 03:15:31 +09:00
Code Issues Packages Projects Releases Wiki Activity

ANDROID: KVM: arm64: Free shadow data vCPUs memcache

Browse Source 
In protected mode, shadow VM structures are created at EL2. They include
shadow vCPUs and their memcache where some pages donated by the host might
be temporarily stored. They need to be freed on VM teardown to not get
lost. Pages found there have not been used for anything by the hypervisor.
Clearing is therefore not necessary.

Bug: 237506543
Change-Id: Ic37d794ac33e9f844fa6ae1b4943febcdad5b033
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
This commit is contained in:
Vincent Donnefort
2022-06-29 16:32:56 +01:00
parent f677cbf076
commit 825e1059b5
1 changed files with 20 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
arch/arm64/kvm/hyp/nvhe/pkvm.c
View File

@@ -600,6 +600,25 @@ static int check_shadow_size(int nr_vcpus, size_t shadow_size)
return 0;
}
static void drain_shadow_vcpus(struct shadow_vcpu_state *shadow_vcpus,
unsigned int nr_vcpus,
struct kvm_hyp_memcache *mc)
{
int i;
for (i = 0; i < nr_vcpus; i++) {
struct kvm_vcpu *shadow_vcpu = &shadow_vcpus[i].vcpu;
struct kvm_hyp_memcache *vcpu_mc = &shadow_vcpu->arch.pkvm_memcache;
void *addr;
while (vcpu_mc->nr_pages) {
addr = pop_hyp_memcache(vcpu_mc, hyp_phys_to_virt);
push_hyp_memcache(mc, addr, hyp_virt_to_phys);
WARN_ON(__pkvm_hyp_donate_host(hyp_virt_to_pfn(addr), 1));
}
}
}
/*
* Initialize the shadow copy of the protected VM state using the memory
* donated by the host.
@@ -753,6 +772,7 @@ int __pkvm_teardown_shadow(int shadow_handle)
/* Reclaim guest pages, and page-table pages */
mc = &vm->host_kvm->arch.pkvm.teardown_mc;
reclaim_guest_pages(vm, mc);
drain_shadow_vcpus(vm->shadow_vcpus, vm->created_vcpus, mc);
unpin_host_vcpus(vm->shadow_vcpus, vm->created_vcpus);
/* Push the metadata pages to the teardown memcache */