shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 19:30:30 +09:00
Code Issues Packages Projects Releases Wiki Activity

ANDROID: KVM: arm64: Implement hyp -> host memory donation

Browse Source 
Returning memory ownership of KVM metadata pages to the host once it is
no longer required (i.e. after VM teardown) can be achieved using a
series of memory donations from the hypervisor to the host.

Implement hyp-to-host memory donation.

Signed-off-by: Quentin Perret <qperret@google.com>
Bug: 209580772
Change-Id: I7c77bf6dae0ee7f96cd032d06b1ced5502530786
Signed-off-by: Will Deacon <willdeacon@google.com>
This commit is contained in:
Quentin Perret
2021-10-18 21:48:28 +01:00
committed by Will Deacon
parent 7479c4b499
commit 17086543c9
1 changed files with 60 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
arch/arm64/kvm/hyp/nvhe/mem_protect.c
View File

@@ -457,6 +457,9 @@ struct pkvm_mem_transition {
/* Address in the completer's address space */
u64 completer_addr;
} host;
struct {
u64 completer_addr;
} hyp;
};
} initiator;
@@ -596,6 +599,30 @@ static int host_initiate_donation(u64 *completer_addr,
return host_stage2_set_owner_locked(tx->initiator.addr, size, owner_id);
}
static bool __host_ack_skip_pgtable_check(const struct pkvm_mem_transition *tx)
{
return !(IS_ENABLED(CONFIG_NVHE_EL2_DEBUG) ||
tx->initiator.id != PKVM_ID_HYP);
}
static int host_ack_donation(u64 addr, const struct pkvm_mem_transition *tx)
{
u64 size = tx->nr_pages * PAGE_SIZE;
if (__host_ack_skip_pgtable_check(tx))
return 0;
return __host_check_page_state_range(addr, size, PKVM_NOPAGE);
}
static int host_complete_donation(u64 addr, const struct pkvm_mem_transition *tx)
{
u64 size = tx->nr_pages * PAGE_SIZE;
u8 host_id = completer_owner_id(tx);
return host_stage2_set_owner_locked(addr, size, host_id);
}
static enum pkvm_page_state hyp_get_page_state(kvm_pte_t pte)
{
if (!kvm_pte_valid(pte))
@@ -616,6 +643,27 @@ static int __hyp_check_page_state_range(u64 addr, u64 size,
return check_page_state_range(&pkvm_pgtable, addr, size, &d);
}
static int hyp_request_donation(u64 *completer_addr,
const struct pkvm_mem_transition *tx)
{
u64 size = tx->nr_pages * PAGE_SIZE;
u64 addr = tx->initiator.addr;
*completer_addr = tx->initiator.hyp.completer_addr;
return __hyp_check_page_state_range(addr, size, PKVM_PAGE_OWNED);
}
static int hyp_initiate_donation(u64 *completer_addr,
const struct pkvm_mem_transition *tx)
{
u64 size = tx->nr_pages * PAGE_SIZE;
int ret;
*completer_addr = tx->initiator.hyp.completer_addr;
ret = kvm_pgtable_hyp_unmap(&pkvm_pgtable, tx->initiator.addr, size);
return (ret != size) ? -EFAULT : 0;
}
static bool __hyp_ack_skip_pgtable_check(const struct pkvm_mem_transition *tx)
{
return !(IS_ENABLED(CONFIG_NVHE_EL2_DEBUG) ||
@@ -846,6 +894,9 @@ static int check_donation(struct pkvm_mem_donation *donation)
case PKVM_ID_HOST:
ret = host_request_owned_transition(&completer_addr, tx);
break;
case PKVM_ID_HYP:
ret = hyp_request_donation(&completer_addr, tx);
break;
default:
ret = -EINVAL;
}
@@ -854,6 +905,9 @@ static int check_donation(struct pkvm_mem_donation *donation)
return ret;
switch (tx->completer.id){
case PKVM_ID_HOST:
ret = host_ack_donation(completer_addr, tx);
break;
case PKVM_ID_HYP:
ret = hyp_ack_donation(completer_addr, tx);
break;
@@ -874,6 +928,9 @@ static int __do_donate(struct pkvm_mem_donation *donation)
case PKVM_ID_HOST:
ret = host_initiate_donation(&completer_addr, tx);
break;
case PKVM_ID_HYP:
ret = hyp_initiate_donation(&completer_addr, tx);
break;
default:
ret = -EINVAL;
}
@@ -882,6 +939,9 @@ static int __do_donate(struct pkvm_mem_donation *donation)
return ret;
switch (tx->completer.id){
case PKVM_ID_HOST:
ret = host_complete_donation(completer_addr, tx);
break;
case PKVM_ID_HYP:
ret = hyp_complete_donation(completer_addr, tx);
break;