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Revert "Revert "FROMLIST: KVM: arm64: pkvm: Refcount the pages shared with EL2""

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This reverts commit 95580d6d6d.

Bug: 233587962
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I99efef4e952305d36d83f3cb299000f563a75959
This commit is contained in:
Will Deacon
2022-07-07 15:51:59 +01:00
parent a6cbbe8d2e
commit c62633d340
1 changed files with 69 additions and 11 deletions
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80
arch/arm64/kvm/mmu.c
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@@ -284,23 +284,72 @@ static phys_addr_t kvm_kaddr_to_phys(void *kaddr)
}
}
static int pkvm_share_hyp(phys_addr_t start, phys_addr_t end)
{
phys_addr_t addr;
int ret;
struct hyp_shared_pfn {
u64 pfn;
int count;
struct rb_node node;
};
for (addr = ALIGN_DOWN(start, PAGE_SIZE); addr < end; addr += PAGE_SIZE) {
ret = kvm_call_hyp_nvhe(__pkvm_host_share_hyp,
__phys_to_pfn(addr));
if (ret)
return ret;
static DEFINE_MUTEX(hyp_shared_pfns_lock);
static struct rb_root hyp_shared_pfns = RB_ROOT;
static struct hyp_shared_pfn *find_shared_pfn(u64 pfn, struct rb_node ***node,
struct rb_node **parent)
{
struct hyp_shared_pfn *this;
*node = &hyp_shared_pfns.rb_node;
*parent = NULL;
while (**node) {
this = container_of(**node, struct hyp_shared_pfn, node);
*parent = **node;
if (this->pfn < pfn)
*node = &((**node)->rb_left);
else if (this->pfn > pfn)
*node = &((**node)->rb_right);
else
return this;
}
return 0;
return NULL;
}
static int share_pfn_hyp(u64 pfn)
{
struct rb_node **node, *parent;
struct hyp_shared_pfn *this;
int ret = 0;
mutex_lock(&hyp_shared_pfns_lock);
this = find_shared_pfn(pfn, &node, &parent);
if (this) {
this->count++;
goto unlock;
}
this = kzalloc(sizeof(*this), GFP_KERNEL);
if (!this) {
ret = -ENOMEM;
goto unlock;
}
this->pfn = pfn;
this->count = 1;
rb_link_node(&this->node, parent, node);
rb_insert_color(&this->node, &hyp_shared_pfns);
ret = kvm_call_hyp_nvhe(__pkvm_host_share_hyp, pfn, 1);
unlock:
mutex_unlock(&hyp_shared_pfns_lock);
return ret;
}
int kvm_share_hyp(void *from, void *to)
{
phys_addr_t start, end, cur;
u64 pfn;
int ret;
if (is_kernel_in_hyp_mode())
return 0;
@@ -315,7 +364,16 @@ int kvm_share_hyp(void *from, void *to)
if (kvm_host_owns_hyp_mappings())
return create_hyp_mappings(from, to, PAGE_HYP);
return pkvm_share_hyp(__pa(from), __pa(to));
start = ALIGN_DOWN(__pa(from), PAGE_SIZE);
end = PAGE_ALIGN(__pa(to));
for (cur = start; cur < end; cur += PAGE_SIZE) {
pfn = __phys_to_pfn(cur);
ret = share_pfn_hyp(pfn);
if (ret)
return ret;
}
return 0;
}
/**