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ANDROID: KVM: arm64: Add __pkvm_hyp_donate_host()

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The hypervisor will soon need to donate memory pages to the host to
return pages backing guest VM metadata during guest teardown, so provide
a helper allowing hyp-to-host memory donations.

Signed-off-by: Quentin Perret <qperret@google.com>
Bug: 209580772
Change-Id: I3013e8f69e9d26fae751bb81cc1e66253f0f5039
Signed-off-by: Will Deacon <willdeacon@google.com>
This commit is contained in:
Quentin Perret
2021-10-18 21:50:22 +01:00
committed by Will Deacon
parent 2c2efee64d
commit 394b00e804
2 changed files with 33 additions and 0 deletions
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1
arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
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@@ -57,6 +57,7 @@ int __pkvm_prot_finalize(void);
int __pkvm_host_share_hyp(u64 pfn);
int __pkvm_host_unshare_hyp(u64 pfn);
int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages);
int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages);
bool addr_is_memory(phys_addr_t phys);
int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_prot prot);

32
arch/arm64/kvm/hyp/nvhe/mem_protect.c
View File

@@ -1069,3 +1069,35 @@ int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages)
return ret;
}
int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages)
{
int ret;
u64 host_addr = hyp_pfn_to_phys(pfn);
u64 hyp_addr = (u64)__hyp_va(host_addr);
struct pkvm_mem_donation donation = {
.tx = {
.nr_pages = nr_pages,
.initiator = {
.id = PKVM_ID_HYP,
.addr = hyp_addr,
.hyp = {
.completer_addr = host_addr,
},
},
.completer = {
.id = PKVM_ID_HOST,
},
},
};
host_lock_component();
hyp_lock_component();
ret = do_donate(&donation);
hyp_unlock_component();
host_unlock_component();
return ret;
}