[Xen-devel] [PATCH V1 2/2] Xen acpi memory hotplug hypercall

["Liu, Jinsong" <jinsong.liu@xxxxxxxxx>]

>From dd622978066d2cf29a26f246ad6c55f51a0a6272 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <jinsong.liu@xxxxxxxxx>
Date: Wed, 21 Nov 2012 15:39:47 +0800
Subject: [PATCH 2/2] Xen acpi memory hotplug hypercall

This patch implement Xen acpi memory hotplug hypercall, extracting
memory information then hypercall to hypervisor.

Signed-off-by: Liu Jinsong <jinsong.liu@xxxxxxxxx>
---
 drivers/xen/xen-acpi-memhotplug.c |   44 +++++++++++++++++++++++++++++++++++++
 include/xen/interface/platform.h  |    9 +++++++
 2 files changed, 53 insertions(+), 0 deletions(-)

diff --git a/drivers/xen/xen-acpi-memhotplug.c 
b/drivers/xen/xen-acpi-memhotplug.c
index f0c7990..877f5c8 100644
--- a/drivers/xen/xen-acpi-memhotplug.c
+++ b/drivers/xen/xen-acpi-memhotplug.c
@@ -18,7 +18,10 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/types.h>
+#include <linux/acpi.h>
 #include <acpi/acpi_drivers.h>
+#include <xen/interface/platform.h>
+#include <asm/xen/hypercall.h>
 
 #define ACPI_MEMORY_DEVICE_CLASS               "memory"
 #define ACPI_MEMORY_DEVICE_HID                 "PNP0C80"
@@ -61,9 +64,50 @@ struct acpi_memory_device {
 
 static int acpi_hotmem_initialized;
 
+static int xen_hotadd_memory(int pxm, struct acpi_memory_info *info)
+{
+       struct xen_platform_op op;
+
+       op.cmd = XENPF_mem_hotadd;
+       op.u.mem_add.spfn = info->start_addr >> PAGE_SHIFT;
+       op.u.mem_add.epfn = (info->start_addr + info->length) >> PAGE_SHIFT;
+       op.u.mem_add.pxm = pxm;
+
+       return HYPERVISOR_dom0_op(&op);
+}
 
 int xen_acpi_memory_enable_device(struct acpi_memory_device *mem_device)
 {
+       int pxm, result;
+       int num_enabled = 0;
+       struct acpi_memory_info *info;
+
+       if (!mem_device)
+               return -EINVAL;
+
+       pxm = acpi_get_pxm(mem_device->device->handle);
+       if (pxm < 0)
+               return -EINVAL;
+
+       list_for_each_entry(info, &mem_device->res_list, list) {
+               if (info->enabled) { /* just sanity check...*/
+                       num_enabled++;
+                       continue;
+               }
+
+               if (!info->length)
+                       continue;
+
+               result = xen_hotadd_memory(pxm, info);
+               if (result)
+                       continue;
+               info->enabled = 1;
+               num_enabled++;
+       }
+
+       if (!num_enabled)
+               return -EINVAL;
+
        return 0;
 }
 
diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
index 4755b5f..45215d9 100644
--- a/include/xen/interface/platform.h
+++ b/include/xen/interface/platform.h
@@ -324,6 +324,14 @@ struct xenpf_cpu_ol {
 };
 DEFINE_GUEST_HANDLE_STRUCT(xenpf_cpu_ol);
 
+#define XENPF_mem_hotadd    59
+struct xenpf_mem_hotadd {
+       uint64_t spfn;
+       uint64_t epfn;
+       uint32_t pxm;
+       uint32_t flags;
+};
+
 struct xen_platform_op {
        uint32_t cmd;
        uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -341,6 +349,7 @@ struct xen_platform_op {
                struct xenpf_set_processor_pminfo set_pminfo;
                struct xenpf_pcpuinfo          pcpu_info;
                struct xenpf_cpu_ol            cpu_ol;
+               struct xenpf_mem_hotadd        mem_add;
                uint8_t                        pad[128];
        } u;
 };
-- 
1.7.1

Attachment: 0002-Xen-acpi-memory-hotplug-hypercall.patch
Description: 0002-Xen-acpi-memory-hotplug-hypercall.patch

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