xen: arm: implement remap interfaces needed for privcmd mappings.
We use XENMEM_add_to_physmap_range which is the preferred interface for foreign mappings. Acked-by: Mukesh Rathor <mukesh.rathor@oracle.com> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Ian Campbell
parent
7892f6928d
commit
f832da068b
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@ -49,6 +49,7 @@ DEFINE_GUEST_HANDLE(void);
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DEFINE_GUEST_HANDLE(uint64_t);
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DEFINE_GUEST_HANDLE(uint32_t);
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DEFINE_GUEST_HANDLE(xen_pfn_t);
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DEFINE_GUEST_HANDLE(xen_ulong_t);
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/* Maximum number of virtual CPUs in multi-processor guests. */
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#define MAX_VIRT_CPUS 1
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@ -9,6 +9,7 @@
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#include <xen/platform_pci.h>
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#include <xen/xenbus.h>
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#include <xen/page.h>
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#include <xen/xen-ops.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include <linux/interrupt.h>
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@ -18,6 +19,8 @@
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#include <linux/of_irq.h>
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#include <linux/of_address.h>
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#include <linux/mm.h>
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struct start_info _xen_start_info;
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struct start_info *xen_start_info = &_xen_start_info;
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EXPORT_SYMBOL_GPL(xen_start_info);
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@ -43,15 +46,106 @@ EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
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static __read_mostly int xen_events_irq = -1;
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/* map fgmfn of domid to lpfn in the current domain */
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static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
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unsigned int domid)
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{
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int rc;
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struct xen_add_to_physmap_range xatp = {
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.domid = DOMID_SELF,
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.foreign_domid = domid,
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.size = 1,
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.space = XENMAPSPACE_gmfn_foreign,
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};
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xen_ulong_t idx = fgmfn;
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xen_pfn_t gpfn = lpfn;
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set_xen_guest_handle(xatp.idxs, &idx);
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set_xen_guest_handle(xatp.gpfns, &gpfn);
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rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
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if (rc) {
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pr_warn("Failed to map pfn to mfn rc:%d pfn:%lx mfn:%lx\n",
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rc, lpfn, fgmfn);
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return 1;
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}
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return 0;
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}
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struct remap_data {
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xen_pfn_t fgmfn; /* foreign domain's gmfn */
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pgprot_t prot;
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domid_t domid;
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struct vm_area_struct *vma;
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int index;
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struct page **pages;
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struct xen_remap_mfn_info *info;
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};
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static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
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void *data)
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{
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struct remap_data *info = data;
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struct page *page = info->pages[info->index++];
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unsigned long pfn = page_to_pfn(page);
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pte_t pte = pfn_pte(pfn, info->prot);
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if (map_foreign_page(pfn, info->fgmfn, info->domid))
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return -EFAULT;
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set_pte_at(info->vma->vm_mm, addr, ptep, pte);
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return 0;
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}
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int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
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unsigned long addr,
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unsigned long mfn, int nr,
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pgprot_t prot, unsigned domid)
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xen_pfn_t mfn, int nr,
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pgprot_t prot, unsigned domid,
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struct page **pages)
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{
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return -ENOSYS;
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int err;
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struct remap_data data;
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/* TBD: Batching, current sole caller only does page at a time */
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if (nr > 1)
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return -EINVAL;
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data.fgmfn = mfn;
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data.prot = prot;
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data.domid = domid;
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data.vma = vma;
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data.index = 0;
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data.pages = pages;
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err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
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remap_pte_fn, &data);
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return err;
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}
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EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
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int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
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int nr, struct page **pages)
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{
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int i;
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for (i = 0; i < nr; i++) {
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struct xen_remove_from_physmap xrp;
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unsigned long rc, pfn;
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pfn = page_to_pfn(pages[i]);
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xrp.domid = DOMID_SELF;
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xrp.gpfn = pfn;
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rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
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if (rc) {
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pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
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pfn, rc);
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return rc;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
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/*
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* see Documentation/devicetree/bindings/arm/xen.txt for the
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* documentation of the Xen Device Tree format.
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@ -63,6 +63,7 @@ DEFINE_GUEST_HANDLE(void);
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DEFINE_GUEST_HANDLE(uint64_t);
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DEFINE_GUEST_HANDLE(uint32_t);
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DEFINE_GUEST_HANDLE(xen_pfn_t);
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DEFINE_GUEST_HANDLE(xen_ulong_t);
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#endif
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#ifndef HYPERVISOR_VIRT_START
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@ -153,6 +153,14 @@ struct xen_machphys_mapping {
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};
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DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t);
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#define XENMAPSPACE_shared_info 0 /* shared info page */
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#define XENMAPSPACE_grant_table 1 /* grant table page */
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#define XENMAPSPACE_gmfn 2 /* GMFN */
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#define XENMAPSPACE_gmfn_range 3 /* GMFN range, XENMEM_add_to_physmap only. */
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#define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another dom,
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* XENMEM_add_to_physmap_range only.
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*/
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/*
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* Sets the GPFN at which a particular page appears in the specified guest's
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* pseudophysical address space.
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@ -167,8 +175,6 @@ struct xen_add_to_physmap {
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uint16_t size;
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/* Source mapping space. */
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#define XENMAPSPACE_shared_info 0 /* shared info page */
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#define XENMAPSPACE_grant_table 1 /* grant table page */
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unsigned int space;
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/* Index into source mapping space. */
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@ -182,6 +188,24 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
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/*** REMOVED ***/
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/*#define XENMEM_translate_gpfn_list 8*/
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#define XENMEM_add_to_physmap_range 23
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struct xen_add_to_physmap_range {
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/* Which domain to change the mapping for. */
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domid_t domid;
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uint16_t space; /* => enum phys_map_space */
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/* Number of pages to go through */
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uint16_t size;
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domid_t foreign_domid; /* IFF gmfn_foreign */
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/* Indexes into space being mapped. */
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GUEST_HANDLE(xen_ulong_t) idxs;
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/* GPFN in domid where the source mapping page should appear. */
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GUEST_HANDLE(xen_pfn_t) gpfns;
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};
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DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap_range);
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/*
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* Returns the pseudo-physical memory map as it was when the domain
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* was started (specified by XENMEM_set_memory_map).
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@ -217,4 +241,20 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map);
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* during a driver critical region.
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*/
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extern spinlock_t xen_reservation_lock;
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/*
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* Unmaps the page appearing at a particular GPFN from the specified guest's
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* pseudophysical address space.
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* arg == addr of xen_remove_from_physmap_t.
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*/
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#define XENMEM_remove_from_physmap 15
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struct xen_remove_from_physmap {
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/* Which domain to change the mapping for. */
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domid_t domid;
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/* GPFN of the current mapping of the page. */
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xen_pfn_t gpfn;
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};
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DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap);
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#endif /* __XEN_PUBLIC_MEMORY_H__ */
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