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xen/privcmd: move remap_domain_mfn_range() to core xen code and export.

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This allows xenfs to be built as a module, previously it required flush_tlb_all
and arbitrary_virt_to_machine to be exported.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Ian Campbell 2009-05-21 10:09:46 +01:00 committed by Jeremy Fitzhardinge
parent f020e29051
commit de1ef2065c
3 changed files with 79 additions and 73 deletions
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66
arch/x86/xen/mmu.c
View File

@ -2265,6 +2265,72 @@ void __init xen_hvm_init_mmu_ops(void)
}
#endif
#define REMAP_BATCH_SIZE 16
struct remap_data {
unsigned long mfn;
pgprot_t prot;
struct mmu_update *mmu_update;
};
static int remap_area_mfn_pte_fn(pte_t *ptep, pgtable_t token,
unsigned long addr, void *data)
{
struct remap_data *rmd = data;
pte_t pte = pte_mkspecial(pfn_pte(rmd->mfn++, rmd->prot));
rmd->mmu_update->ptr = arbitrary_virt_to_machine(ptep).maddr;
rmd->mmu_update->val = pte_val_ma(pte);
rmd->mmu_update++;
return 0;
}
int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
unsigned long addr,
unsigned long mfn, int nr,
pgprot_t prot, unsigned domid)
{
struct remap_data rmd;
struct mmu_update mmu_update[REMAP_BATCH_SIZE];
int batch;
unsigned long range;
int err = 0;
prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP);
vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
rmd.mfn = mfn;
rmd.prot = prot;
while (nr) {
batch = min(REMAP_BATCH_SIZE, nr);
range = (unsigned long)batch << PAGE_SHIFT;
rmd.mmu_update = mmu_update;
err = apply_to_page_range(vma->vm_mm, addr, range,
remap_area_mfn_pte_fn, &rmd);
if (err)
goto out;
err = -EFAULT;
if (HYPERVISOR_mmu_update(mmu_update, batch, NULL, domid) < 0)
goto out;
nr -= batch;
addr += range;
}
err = 0;
out:
flush_tlb_all();
return err;
}
EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
#ifdef CONFIG_XEN_DEBUG_FS
static struct dentry *d_mmu_debug;

71
drivers/xen/xenfs/privcmd.c
View File

@ -31,76 +31,12 @@
#include <xen/interface/xen.h>
#include <xen/features.h>
#include <xen/page.h>
#define REMAP_BATCH_SIZE 16
#include <xen/xen-ops.h>
#ifndef HAVE_ARCH_PRIVCMD_MMAP
static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma);
#endif
struct remap_data {
unsigned long mfn;
pgprot_t prot;
struct mmu_update *mmu_update;
};
static int remap_area_mfn_pte_fn(pte_t *ptep, pgtable_t token,
unsigned long addr, void *data)
{
struct remap_data *rmd = data;
pte_t pte = pte_mkspecial(pfn_pte(rmd->mfn++, rmd->prot));
rmd->mmu_update->ptr = arbitrary_virt_to_machine(ptep).maddr;
rmd->mmu_update->val = pte_val_ma(pte);
rmd->mmu_update++;
return 0;
}
static int remap_domain_mfn_range(struct vm_area_struct *vma,
unsigned long addr,
unsigned long mfn, int nr,
pgprot_t prot, unsigned domid)
{
struct remap_data rmd;
struct mmu_update mmu_update[REMAP_BATCH_SIZE];
int batch;
unsigned long range;
int err = 0;
prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP);
vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
rmd.mfn = mfn;
rmd.prot = prot;
while (nr) {
batch = min(REMAP_BATCH_SIZE, nr);
range = (unsigned long)batch << PAGE_SHIFT;
rmd.mmu_update = mmu_update;
err = apply_to_page_range(vma->vm_mm, addr, range,
remap_area_mfn_pte_fn, &rmd);
if (err)
goto out;
err = -EFAULT;
if (HYPERVISOR_mmu_update(mmu_update, batch, NULL, domid) < 0)
goto out;
nr -= batch;
addr += range;
}
err = 0;
out:
flush_tlb_all();
return err;
}
static long privcmd_ioctl_hypercall(void __user *udata)
{
struct privcmd_hypercall hypercall;
@ -233,7 +169,7 @@ static int mmap_mfn_range(void *data, void *state)
((msg->va+(msg->npages<<PAGE_SHIFT)) > vma->vm_end))
return -EINVAL;
rc = remap_domain_mfn_range(vma,
rc = xen_remap_domain_mfn_range(vma,
msg->va & PAGE_MASK,
msg->mfn, msg->npages,
vma->vm_page_prot,
@ -315,8 +251,7 @@ static int mmap_batch_fn(void *data, void *state)
xen_pfn_t *mfnp = data;
struct mmap_batch_state *st = state;
if (remap_domain_mfn_range(st->vma, st->va & PAGE_MASK,
*mfnp, 1,
if (xen_remap_domain_mfn_range(st->vma, st->va & PAGE_MASK, *mfnp, 1,
st->vma->vm_page_prot, st->domain) < 0) {
*mfnp |= 0xf0000000U;
st->err++;

5
include/xen/xen-ops.h
View File

@ -23,4 +23,9 @@ int xen_create_contiguous_region(unsigned long vstart, unsigned int order,
void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order);
int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
unsigned long addr,
unsigned long mfn, int nr,
pgprot_t prot, unsigned domid);
#endif /* INCLUDE_XEN_OPS_H */