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ACRN:DM: Add one API to query the memfd/offset for the given GPA

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After using the memfd to allocate memory for guest vm, it needs to
query the offset in memfd for the given GPA. In order to search the
memfd/offset, the added memory_region from memfd needs to be kept in
one arrary.

Tracked-On: #7210

Acked-by: Wang Yu <yu1.wang@intel.com>
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
This commit is contained in:
Zhao Yakui 2022-04-01 10:56:47 +08:00 committed by acrnsi-robot
parent a46b0058d8
commit 3645a9557d
2 changed files with 58 additions and 0 deletions
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52
devicemodel/core/hugetlb.c
View File

@ -128,6 +128,17 @@ static struct hugetlb_info hugetlb_priv[HUGETLB_LV_MAX] = {
},
};
struct vm_mmap_mem_region {
vm_paddr_t gpa_start;
vm_paddr_t gpa_end;
vm_paddr_t fd_offset;
char *hva_base;
int fd;
};
static struct vm_mmap_mem_region mmap_mem_regions[16];
static int mem_idx;
static void *ptr;
static size_t total_size;
static int hugetlb_lv_max;
@ -207,6 +218,10 @@ static int mmap_hugetlbfs_from_level(struct vmctx *ctx, int level, size_t len,
pr_err("exceed max hugetlb level");
return -EINVAL;
}
if (mem_idx >= ARRAY_SIZE(mmap_mem_regions)) {
pr_err("exceed supported regions.\n");
return -EFAULT;
}
fd = hugetlb_priv[level].fd;
addr = mmap(ctx->baseaddr + offset, len, PROT_READ | PROT_WRITE,
@ -217,6 +232,13 @@ static int mmap_hugetlbfs_from_level(struct vmctx *ctx, int level, size_t len,
if (addr_out)
*addr_out = addr;
/* add the mapping into mmap_mem_region */
mmap_mem_regions[mem_idx].gpa_start = offset;
mmap_mem_regions[mem_idx].gpa_end = offset + len;
mmap_mem_regions[mem_idx].fd = fd;
mmap_mem_regions[mem_idx].fd_offset = skip;
mmap_mem_regions[mem_idx].hva_base = addr;
mem_idx++;
pr_info("mmap 0x%lx@%p\n", len, addr);
/* pre-allocate hugepages by touch them */
@ -586,6 +608,8 @@ int hugetlb_setup_memory(struct vmctx *ctx)
unsigned int seal_flag = F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL;
size_t mem_size_level;
mem_idx = 0;
memset(&mmap_mem_regions, 0, sizeof(mmap_mem_regions));
if (ctx->lowmem == 0) {
pr_err("vm requests 0 memory");
goto err;
@ -829,3 +853,31 @@ void hugetlb_unsetup_memory(struct vmctx *ctx)
close_hugetlbfs(level);
}
}
bool
vm_find_memfd_region(struct vmctx *ctx, vm_paddr_t gpa,
struct vm_mem_region *ret_region)
{
int i;
uint64_t offset;
struct vm_mmap_mem_region *mmap_region;
bool ret;
mmap_region = NULL;
for (i = 0; i < mem_idx; i++) {
if ((gpa >= mmap_mem_regions[i].gpa_start) &&
(gpa < mmap_mem_regions[i].gpa_end)) {
mmap_region = &mmap_mem_regions[i];
break;
}
}
if (mmap_region && ret_region) {
ret = true;
offset = gpa - mmap_region->gpa_start;
ret_region->fd = mmap_region->fd;
ret_region->fd_offset = offset + mmap_region->fd_offset;
} else
ret = false;
return ret;
}

6
devicemodel/include/vmmapi.h
View File

@ -89,6 +89,12 @@ struct vm_isa_irq {
int ioapic_irq;
};
struct vm_mem_region {
uint64_t fd_offset;
int fd;
};
bool vm_find_memfd_region(struct vmctx *ctx, vm_paddr_t gpa,
struct vm_mem_region *ret_region);
/*
* Create a device memory segment identified by 'segid'.
*