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ANDROID: KVM: arm64: Add generic hyp_memcache helpers

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The host and hypervisor will need to dynamically exchange memory pages
soon. Indeed, the hypervisor will rely on the host to donate memory
pages it can use to create guest stage-2 page-table and to store
metadata. In order to ease this process, introduce a struct hyp_memcache
which is essentially a linked list of available pages, indexed by
physical addresses.

Signed-off-by: Quentin Perret <qperret@google.com>
Bug: 209580772
Change-Id: Iae46d01e4c0f75cc637adf50a7d0a879d85dff5e
Signed-off-by: Will Deacon <willdeacon@google.com>
This commit is contained in:
Quentin Perret
2021-10-21 10:18:24 +01:00
committed by Will Deacon
parent 2549cef744
commit 4170e1abe7
1 changed files with 54 additions and 0 deletions
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54
arch/arm64/include/asm/kvm_host.h
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@@ -71,6 +71,60 @@ u32 __attribute_const__ kvm_target_cpu(void);
int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
struct kvm_hyp_memcache {
phys_addr_t head;
unsigned long nr_pages;
};
static inline void push_hyp_memcache(struct kvm_hyp_memcache *mc,
phys_addr_t *p,
phys_addr_t (*to_pa)(void *virt))
{
*p = mc->head;
mc->head = to_pa(p);
mc->nr_pages++;
}
static inline void *pop_hyp_memcache(struct kvm_hyp_memcache *mc,
void *(*to_va)(phys_addr_t phys))
{
phys_addr_t *p = to_va(mc->head);
if (!mc->nr_pages)
return NULL;
mc->head = *p;
mc->nr_pages--;
return p;
}
static inline int __topup_hyp_memcache(struct kvm_hyp_memcache *mc,
unsigned long min_pages,
void *(*alloc_fn)(void *arg),
phys_addr_t (*to_pa)(void *virt),
void *arg)
{
while (mc->nr_pages < min_pages) {
phys_addr_t *p = alloc_fn(arg);
if (!p)
return -ENOMEM;
push_hyp_memcache(mc, p, to_pa);
}
return 0;
}
static inline void __free_hyp_memcache(struct kvm_hyp_memcache *mc,
void (*free_fn)(void *virt, void *arg),
void *(*to_va)(phys_addr_t phys),
void *arg)
{
while (mc->nr_pages)
free_fn(pop_hyp_memcache(mc, to_va), arg);
}
struct kvm_vmid {
/* The VMID generation used for the virt. memory system */
u64 vmid_gen;