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Subject[PATCH v6 17/19] xen: introduce XENMEM_pin
Date
Introduce a new hypercall to pin one or more pages whose machine
addresses respect a dma_mask passed as an argument

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
arch/arm/xen/mm.c | 16 ++++++++++++++++
arch/x86/xen/mmu.c | 7 +++++++
include/xen/interface/memory.h | 32 ++++++++++++++++++++++++++++++++
include/xen/xen-ops.h | 1 +
4 files changed, 56 insertions(+), 0 deletions(-)

diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index b305b94..146c1c3 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -55,6 +55,22 @@ static int xen_exchange_memory(xen_ulong_t extents_in,
return success;
}

+int xen_pin_page(xen_pfn_t *in_frame, unsigned int address_bits)
+{
+ struct xen_pin pin = {
+ .in = {
+ .nr_extents = 1,
+ .extent_order = 0,
+ .domid = DOMID_SELF,
+ .address_bits = address_bits
+ },
+ };
+ set_xen_guest_handle(pin.in.extent_start, in_frame);
+
+ return HYPERVISOR_memory_op(XENMEM_pin, &pin);
+}
+EXPORT_SYMBOL_GPL(xen_pin_page);
+
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle)
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 8830883..8f76ce2 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2568,3 +2568,10 @@ int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
return -EINVAL;
}
EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
+
+int xen_pin_page(xen_pfn_t *in_frame, unsigned int address_bits)
+{
+ return -ENOSYS;
+}
+EXPORT_SYMBOL_GPL(xen_pin_page);
+
diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
index 49db252..66ab578 100644
--- a/include/xen/interface/memory.h
+++ b/include/xen/interface/memory.h
@@ -314,4 +314,36 @@ struct xen_unpin {
};
DEFINE_GUEST_HANDLE_STRUCT(xen_unpin);

+/*
+ * XENMEM_pin pins a set of pages to make sure that the hypervisor does
+ * not change the p2m mappings for them.
+ *
+ */
+#define XENMEM_pin 28
+struct xen_pin {
+ /*
+ * [IN/OUT] Details of memory extents to be pinned (GMFN bases).
+ * Xen copies back the MFNs corresponding to the GMFNs passed in as
+ * argument.
+ * @in.address_bits contains the maximum number of bits addressable
+ * by the caller. If the machine addresses of the pages to be pinned
+ * are not addressable according to @in.address_bits, the hypercall
+ * fails and returns an errors. The pages are not pinned. Otherwise
+ * the hypercall succeeds.
+ */
+ struct xen_memory_reservation in;
+
+ /*
+ * [OUT] Number of input extents that were successfully pinned.
+ * 1. The first @nr_pinned input extents were successfully
+ * pinned.
+ * 2. All other input extents are untouched.
+ * 3. If not all input extents are pinned then the return code of this
+ * command will be non-zero.
+ */
+ xen_ulong_t nr_pinned;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xen_pin);
+
+
#endif /* __XEN_PUBLIC_MEMORY_H__ */
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index fb2ea8f..4cf4fc5 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -22,6 +22,7 @@ extern unsigned long *xen_contiguous_bitmap;
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle);
+int xen_pin_page(xen_pfn_t *in_frame, unsigned int address_bits);

void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order);

--
1.7.2.5


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