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

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Date:	Wed, 21 Nov 2012 11:46:53 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
CC:	"lenb@...nel.org" <lenb@...nel.org>
Subject: [PATCH V1 2/2] Xen acpi memory hotplug hypercall

>From dd622978066d2cf29a26f246ad6c55f51a0a6272 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <jinsong.liu@...el.com>
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@...el.com>
---
 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

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