mm.h File Reference

#include <asm/kvm_pgtable.h>
#include <asm/spectre.h>
#include <linux/memblock.h>
#include <linux/types.h>
#include <nvhe/memory.h>
#include <nvhe/spinlock.h>

Include dependency graph for mm.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
int	hyp_create_pcpu_fixmap (void)
void *	hyp_fixmap_map (phys_addr_t phys)
void	hyp_fixmap_unmap (void)
int	hyp_create_idmap (u32 hyp_va_bits)
int	hyp_map_vectors (void)
int	hyp_back_vmemmap (phys_addr_t back)
int	pkvm_cpu_set_vector (enum arm64_hyp_spectre_vector slot)
int	pkvm_create_mappings (void *from, void *to, enum kvm_pgtable_prot prot)
int	pkvm_create_mappings_locked (void *from, void *to, enum kvm_pgtable_prot prot)
int	__pkvm_create_private_mapping (phys_addr_t phys, size_t size, enum kvm_pgtable_prot prot, unsigned long *haddr)
int	pkvm_create_stack (phys_addr_t phys, unsigned long *haddr)
int	pkvm_alloc_private_va_range (size_t size, unsigned long *haddr)

Variables
struct kvm_pgtable	pkvm_pgtable
hyp_spinlock_t	pkvm_pgd_lock

Function Documentation

__pkvm_create_private_mapping()

int __pkvm_create_private_mapping	(	phys_addr_t	phys,
		size_t	size,
		enum kvm_pgtable_prot	prot,
		unsigned long *	haddr
	)

Definition at line 93 of file mm.c.

{
    unsigned long addr;
    int err;
 
    size = PAGE_ALIGN(size + offset_in_page(phys));
    err = pkvm_alloc_private_va_range(size, &addr);
    if (err)
        return err;
 
    err = __pkvm_create_mappings(addr, size, phys, prot);
    if (err)
        return err;
 
    *haddr = addr + offset_in_page(phys);
    return err;
}

Here is the call graph for this function:

Here is the caller graph for this function:

hyp_back_vmemmap()

int hyp_back_vmemmap

(

phys_addr_t

back

)

Definition at line 149 of file mm.c.

{
    unsigned long i, start, size, end = 0;
    int ret;
 
    for (i = 0; i < hyp_memblock_nr; i++) {
        start = hyp_memory[i].base;
        start = ALIGN_DOWN((u64)hyp_phys_to_page(start), PAGE_SIZE);
        /*
         * The begining of the hyp_vmemmap region for the current
         * memblock may already be backed by the page backing the end
         * the previous region, so avoid mapping it twice.
         */
        start = max(start, end);
 
        end = hyp_memory[i].base + hyp_memory[i].size;
        end = PAGE_ALIGN((u64)hyp_phys_to_page(end));
        if (start >= end)
            continue;
 
        size = end - start;
        ret = __pkvm_create_mappings(start, size, back, PAGE_HYP);
        if (ret)
            return ret;
 
        memset(hyp_phys_to_virt(back), 0, size);
        back += size;
    }
 
    return 0;
}

Here is the call graph for this function:

Here is the caller graph for this function:

hyp_create_idmap()

int hyp_create_idmap

(

u32

hyp_va_bits

)

Definition at line 328 of file mm.c.

{
    unsigned long start, end;
 
    start = hyp_virt_to_phys((void *)__hyp_idmap_text_start);
    start = ALIGN_DOWN(start, PAGE_SIZE);
 
    end = hyp_virt_to_phys((void *)__hyp_idmap_text_end);
    end = ALIGN(end, PAGE_SIZE);
 
    /*
     * One half of the VA space is reserved to linearly map portions of
     * memory -- see va_layout.c for more details. The other half of the VA
     * space contains the trampoline page, and needs some care. Split that
     * second half in two and find the quarter of VA space not conflicting
     * with the idmap to place the IOs and the vmemmap. IOs use the lower
     * half of the quarter and the vmemmap the upper half.
     */
    __io_map_base = start & BIT(hyp_va_bits - 2);
    __io_map_base ^= BIT(hyp_va_bits - 2);
    __hyp_vmemmap = __io_map_base | BIT(hyp_va_bits - 3);
 
    return __pkvm_create_mappings(start, end - start, start, PAGE_HYP_EXEC);
}

Here is the call graph for this function:

Here is the caller graph for this function:

hyp_create_pcpu_fixmap()

int hyp_create_pcpu_fixmap

(

void

)

Definition at line 305 of file mm.c.

{
    unsigned long addr, i;
    int ret;
 
    for (i = 0; i < hyp_nr_cpus; i++) {
        ret = pkvm_alloc_private_va_range(PAGE_SIZE, &addr);
        if (ret)
            return ret;
 
        ret = kvm_pgtable_hyp_map(&pkvm_pgtable, addr, PAGE_SIZE,
                      __hyp_pa(__hyp_bss_start), PAGE_HYP);
        if (ret)
            return ret;
 
        ret = create_fixmap_slot(addr, i);
        if (ret)
            return ret;
    }
 
    return 0;
}

Here is the call graph for this function:

Here is the caller graph for this function:

hyp_fixmap_map()

void* hyp_fixmap_map

(

phys_addr_t

phys

)

Definition at line 232 of file mm.c.

{
    struct hyp_fixmap_slot *slot = this_cpu_ptr(&fixmap_slots);
    kvm_pte_t pte, *ptep = slot->ptep;
 
    pte = *ptep;
    pte &= ~kvm_phys_to_pte(KVM_PHYS_INVALID);
    pte |= kvm_phys_to_pte(phys) | KVM_PTE_VALID;
    WRITE_ONCE(*ptep, pte);
    dsb(ishst);
 
    return (void *)slot->addr;
}

Here is the caller graph for this function:

hyp_fixmap_unmap()

void hyp_fixmap_unmap

(

void

)

Definition at line 268 of file mm.c.

{
    fixmap_clear_slot(this_cpu_ptr(&fixmap_slots));
}

Here is the call graph for this function:

Here is the caller graph for this function:

hyp_map_vectors()

int hyp_map_vectors

(

void

)

Definition at line 210 of file mm.c.

{
    phys_addr_t phys;
    unsigned long bp_base;
    int ret;
 
    if (!kvm_system_needs_idmapped_vectors()) {
        __hyp_bp_vect_base = __bp_harden_hyp_vecs;
        return 0;
    }
 
    phys = __hyp_pa(__bp_harden_hyp_vecs);
    ret = __pkvm_create_private_mapping(phys, __BP_HARDEN_HYP_VECS_SZ,
                        PAGE_HYP_EXEC, &bp_base);
    if (ret)
        return ret;
 
    __hyp_bp_vect_base = (void *)bp_base;
 
    return 0;
}

Here is the call graph for this function:

Here is the caller graph for this function:

pkvm_alloc_private_va_range()

int pkvm_alloc_private_va_range	(	size_t	size,
		unsigned long *	haddr
	)

pkvm_alloc_private_va_range - Allocates a private VA range. @size: The size of the VA range to reserve. @haddr: The hypervisor virtual start address of the allocation.

The private virtual address (VA) range is allocated above __io_map_base and aligned based on the order of @size.

Return: 0 on success or negative error code on failure.

Definition at line 78 of file mm.c.

{
    unsigned long addr;
    int ret;
 
    hyp_spin_lock(&pkvm_pgd_lock);
    addr = __io_map_base;
    ret = __pkvm_alloc_private_va_range(addr, size);
    hyp_spin_unlock(&pkvm_pgd_lock);
 
    *haddr = addr;
 
    return ret;
}

Here is the call graph for this function:

Here is the caller graph for this function:

pkvm_cpu_set_vector()

int pkvm_cpu_set_vector

(

enum arm64_hyp_spectre_vector

slot

)

Definition at line 182 of file mm.c.

{
    void *vector;
 
    switch (slot) {
    case HYP_VECTOR_DIRECT: {
        vector = __kvm_hyp_vector;
        break;
    }
    case HYP_VECTOR_SPECTRE_DIRECT: {
        vector = __bp_harden_hyp_vecs;
        break;
    }
    case HYP_VECTOR_INDIRECT:
    case HYP_VECTOR_SPECTRE_INDIRECT: {
        vector = (void *)__hyp_bp_vect_base;
        break;
    }
    default:
        return -EINVAL;
    }
 
    vector = __kvm_vector_slot2addr(vector, slot);
    *this_cpu_ptr(&kvm_hyp_vector) = (unsigned long)vector;
 
    return 0;
}

Here is the caller graph for this function:

pkvm_create_mappings()

int pkvm_create_mappings	(	void *	from,
		void *	to,
		enum kvm_pgtable_prot	prot
	)

Definition at line 138 of file mm.c.

{
    int ret;
 
    hyp_spin_lock(&pkvm_pgd_lock);
    ret = pkvm_create_mappings_locked(from, to, prot);
    hyp_spin_unlock(&pkvm_pgd_lock);
 
    return ret;
}

Here is the call graph for this function:

Here is the caller graph for this function:

pkvm_create_mappings_locked()

int pkvm_create_mappings_locked	(	void *	from,
		void *	to,
		enum kvm_pgtable_prot	prot
	)

Definition at line 113 of file mm.c.

{
    unsigned long start = (unsigned long)from;
    unsigned long end = (unsigned long)to;
    unsigned long virt_addr;
    phys_addr_t phys;
 
    hyp_assert_lock_held(&pkvm_pgd_lock);
 
    start = start & PAGE_MASK;
    end = PAGE_ALIGN(end);
 
    for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) {
        int err;
 
        phys = hyp_virt_to_phys((void *)virt_addr);
        err = kvm_pgtable_hyp_map(&pkvm_pgtable, virt_addr, PAGE_SIZE,
                      phys, prot);
        if (err)
            return err;
    }
 
    return 0;
}

Here is the call graph for this function:

Here is the caller graph for this function:

pkvm_create_stack()

int pkvm_create_stack	(	phys_addr_t	phys,
		unsigned long *	haddr
	)

Definition at line 353 of file mm.c.

{
    unsigned long addr, prev_base;
    size_t size;
    int ret;
 
    hyp_spin_lock(&pkvm_pgd_lock);
 
    prev_base = __io_map_base;
    /*
     * Efficient stack verification using the PAGE_SHIFT bit implies
     * an alignment of our allocation on the order of the size.
     */
    size = PAGE_SIZE * 2;
    addr = ALIGN(__io_map_base, size);
 
    ret = __pkvm_alloc_private_va_range(addr, size);
    if (!ret) {
        /*
         * Since the stack grows downwards, map the stack to the page
         * at the higher address and leave the lower guard page
         * unbacked.
         *
         * Any valid stack address now has the PAGE_SHIFT bit as 1
         * and addresses corresponding to the guard page have the
         * PAGE_SHIFT bit as 0 - this is used for overflow detection.
         */
        ret = kvm_pgtable_hyp_map(&pkvm_pgtable, addr + PAGE_SIZE,
                      PAGE_SIZE, phys, PAGE_HYP);
        if (ret)
            __io_map_base = prev_base;
    }
    hyp_spin_unlock(&pkvm_pgd_lock);
 
    *haddr = addr + size;
 
    return ret;
}

Here is the call graph for this function:

Here is the caller graph for this function:

Variable Documentation

pkvm_pgd_lock

hyp_spinlock_t pkvm_pgd_lock

extern

Definition at line 22 of file mm.c.

pkvm_pgtable

struct kvm_pgtable pkvm_pgtable

extern

Definition at line 1 of file mm.c.