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Date: Wed, 24 Oct 2012 14:19:36 +0100
From: Ian Campbell <ian.campbell@...rix.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC: Stefano Stabellini <stefano.stabellini@...rix.com>,
xen-devel <xen-devel@...ts.xen.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Ian Campbell <ian.campbell@...rix.com>
Subject: [PATCH 4/5] xen: arm: implement remap interfaces needed for privcmd mappings.
We use XENMEM_add_to_physmap_range which is the preferred interface
for foreign mappings.
Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
---
arch/arm/include/asm/xen/interface.h | 1 +
arch/arm/xen/enlighten.c | 100 +++++++++++++++++++++++++++++++++-
arch/x86/include/asm/xen/interface.h | 1 +
include/xen/interface/memory.h | 18 ++++++
4 files changed, 117 insertions(+), 3 deletions(-)
diff --git a/arch/arm/include/asm/xen/interface.h b/arch/arm/include/asm/xen/interface.h
index 5000397..1151188 100644
--- a/arch/arm/include/asm/xen/interface.h
+++ b/arch/arm/include/asm/xen/interface.h
@@ -49,6 +49,7 @@ DEFINE_GUEST_HANDLE(void);
DEFINE_GUEST_HANDLE(uint64_t);
DEFINE_GUEST_HANDLE(uint32_t);
DEFINE_GUEST_HANDLE(xen_pfn_t);
+DEFINE_GUEST_HANDLE(xen_ulong_t);
/* Maximum number of virtual CPUs in multi-processor guests. */
#define MAX_VIRT_CPUS 1
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index ba5cc13..f28fc1a 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -9,6 +9,7 @@
#include <xen/platform_pci.h>
#include <xen/xenbus.h>
#include <xen/page.h>
+#include <xen/xen-ops.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <linux/interrupt.h>
@@ -18,6 +19,8 @@
#include <linux/of_irq.h>
#include <linux/of_address.h>
+#include <linux/mm.h>
+
struct start_info _xen_start_info;
struct start_info *xen_start_info = &_xen_start_info;
EXPORT_SYMBOL_GPL(xen_start_info);
@@ -43,15 +46,106 @@ EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
static __read_mostly int xen_events_irq = -1;
+/* map fgmfn of domid to lpfn in the current domain */
+static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
+ unsigned int domid)
+{
+ int rc;
+ struct xen_add_to_physmap_range xatp = {
+ .domid = DOMID_SELF,
+ .foreign_domid = domid,
+ .size = 1,
+ .space = XENMAPSPACE_gmfn_foreign,
+ };
+ xen_ulong_t idx = fgmfn;
+ xen_pfn_t gpfn = lpfn;
+
+ set_xen_guest_handle(xatp.idxs, &idx);
+ set_xen_guest_handle(xatp.gpfns, &gpfn);
+
+ rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
+ if (rc) {
+ pr_warn("Failed to map pfn to mfn rc:%d pfn:%lx mfn:%lx\n",
+ rc, lpfn, fgmfn);
+ return 1;
+ }
+ return 0;
+}
+
+struct remap_data {
+ xen_pfn_t fgmfn; /* foreign domain's gmfn */
+ pgprot_t prot;
+ domid_t domid;
+ struct vm_area_struct *vma;
+ int index;
+ struct page **pages;
+ struct xen_remap_mfn_info *info;
+};
+
+static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
+ void *data)
+{
+ struct remap_data *info = data;
+ struct page *page = info->pages[info->index++];
+ unsigned long pfn = page_to_pfn(page);
+ pte_t pte = pfn_pte(pfn, info->prot);
+
+ if (map_foreign_page(pfn, info->fgmfn, info->domid))
+ return -EFAULT;
+ set_pte_at(info->vma->vm_mm, addr, ptep, pte);
+
+ 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)
+ xen_pfn_t mfn, int nr,
+ pgprot_t prot, unsigned domid,
+ struct page **pages)
{
- return -ENOSYS;
+ int err;
+ struct remap_data data;
+
+ /* TBD: Batching, current sole caller only does page at a time */
+ if (nr > 1)
+ return -EINVAL;
+
+ data.fgmfn = mfn;
+ data.prot = prot;
+ data.domid = domid;
+ data.vma = vma;
+ data.index = 0;
+ data.pages = pages;
+ err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
+ remap_pte_fn, &data);
+ return err;
}
EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
+int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
+ int nr, struct page **pages)
+{
+ int i;
+
+ for (i = 0; i < nr; i++) {
+ struct xen_remove_from_physmap xrp;
+ unsigned long rc, pfn;
+
+ pfn = page_to_pfn(pages[i]);
+
+ xrp.domid = DOMID_SELF;
+ xrp.gpfn = pfn;
+ rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
+ if (rc) {
+ pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
+ pfn, rc);
+ return rc;
+ }
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
+
/*
* see Documentation/devicetree/bindings/arm/xen.txt for the
* documentation of the Xen Device Tree format.
diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h
index b459d2e..20e738a 100644
--- a/arch/x86/include/asm/xen/interface.h
+++ b/arch/x86/include/asm/xen/interface.h
@@ -63,6 +63,7 @@ DEFINE_GUEST_HANDLE(void);
DEFINE_GUEST_HANDLE(uint64_t);
DEFINE_GUEST_HANDLE(uint32_t);
DEFINE_GUEST_HANDLE(xen_pfn_t);
+DEFINE_GUEST_HANDLE(xen_ulong_t);
#endif
#ifndef HYPERVISOR_VIRT_START
diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
index ad0dff5..5de2b36 100644
--- a/include/xen/interface/memory.h
+++ b/include/xen/interface/memory.h
@@ -188,6 +188,24 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
/*** REMOVED ***/
/*#define XENMEM_translate_gpfn_list 8*/
+#define XENMEM_add_to_physmap_range 23
+struct xen_add_to_physmap_range {
+ /* Which domain to change the mapping for. */
+ domid_t domid;
+ uint16_t space; /* => enum phys_map_space */
+
+ /* Number of pages to go through */
+ uint16_t size;
+ domid_t foreign_domid; /* IFF gmfn_foreign */
+
+ /* Indexes into space being mapped. */
+ GUEST_HANDLE(xen_ulong_t) idxs;
+
+ /* GPFN in domid where the source mapping page should appear. */
+ GUEST_HANDLE(xen_pfn_t) gpfns;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap_range);
+
/*
* Returns the pseudo-physical memory map as it was when the domain
* was started (specified by XENMEM_set_memory_map).
--
1.7.2.5
--
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