arch/arm64/include/asm/kvm_host.h

Source file repositories/reference/linux-study-clean/arch/arm64/include/asm/kvm_host.h

File Facts

System
Linux kernel
Corpus path
arch/arm64/include/asm/kvm_host.h
Extension
.h
Size
51640 bytes
Lines
1715
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct kvm_hyp_memcache {
	phys_addr_t head;
	unsigned long nr_pages;
	struct pkvm_mapping *mapping; /* only used from EL1 */

#define	HYP_MEMCACHE_ACCOUNT_STAGE2	BIT(1)
	unsigned long flags;
};

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 & PAGE_MASK);

	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);
}

void free_hyp_memcache(struct kvm_hyp_memcache *mc);
int topup_hyp_memcache(struct kvm_hyp_memcache *mc, unsigned long min_pages);

struct kvm_vmid {
	atomic64_t id;
};

struct kvm_s2_mmu {
	struct kvm_vmid vmid;

	/*
	 * stage2 entry level table
	 *
	 * Two kvm_s2_mmu structures in the same VM can point to the same
	 * pgd here.  This happens when running a guest using a
	 * translation regime that isn't affected by its own stage-2
	 * translation, such as a non-VHE hypervisor running at vEL2, or
	 * for vEL1/EL0 with vHCR_EL2.VM == 0.  In that case, we use the
	 * canonical stage-2 page tables.
	 */
	phys_addr_t	pgd_phys;
	struct kvm_pgtable *pgt;

	/*
	 * VTCR value used on the host. For a non-NV guest (or a NV
	 * guest that runs in a context where its own S2 doesn't
	 * apply), its T0SZ value reflects that of the IPA size.
	 *
	 * For a shadow S2 MMU, T0SZ reflects the PARange exposed to
	 * the guest.
	 */
	u64	vtcr;

Annotation

Implementation Notes