From: Chunyan Liu <cyliu@suse.com>
Date: Mon, 7 Jul 2014 06:34:35 +0000 (+0800)
Subject: qemu: support xen hvm direct kernel boot
X-Git-Tag: qemu-xen-4.5.0-rc1~2
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=e9ba6139d411aedf5df36c07d6f867503fd883ba;p=qemu-upstream-4.5-testing.git

qemu: support xen hvm direct kernel boot

qemu side patch to support xen HVM direct kernel boot:
if -kernel exists, calls xen_load_linux(), which will read kernel/initrd
and add a linuxboot.bin or multiboot.bin option rom. The
linuxboot.bin/multiboot.bin will load kernel/initrd and jump to execute
kernel directly. It's working when xen uses seabios.

During this work, found the 'kvmvapic' is in option_rom list, it should
not be there in xen case. Set s->vapic_control = 0 in xen_apic_realize()
to handle that.

Signed-off-by: Chunyan Liu <cyliu@suse.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>

Conflicts:
	hw/i386/pc.c
	hw/i386/pc_piix.c
	include/hw/i386/pc.h
---

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 14f0d91f7..30d3bfaa8 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1157,6 +1157,31 @@ void pc_acpi_init(const char *default_dsdt)
     }
 }
 
+FWCfgState *xen_load_linux(const char *kernel_filename,
+                           const char *kernel_cmdline,
+                           const char *initrd_filename,
+                           ram_addr_t below_4g_mem_size,
+                           PcGuestInfo *guest_info)
+{
+    int i;
+    FWCfgState *fw_cfg;
+
+    assert(kernel_filename != NULL);
+
+    fw_cfg = fw_cfg_init(BIOS_CFG_IOPORT, BIOS_CFG_IOPORT + 1, 0, 0);
+    rom_set_fw(fw_cfg);
+
+    load_linux(fw_cfg, kernel_filename, initrd_filename,
+               kernel_cmdline, below_4g_mem_size);
+    for (i = 0; i < nb_option_roms; i++) {
+        assert(!strcmp(option_rom[i].name, "linuxboot.bin") ||
+               !strcmp(option_rom[i].name, "multiboot.bin"));
+        rom_add_option(option_rom[i].name, option_rom[i].bootindex);
+    }
+    guest_info->fw_cfg = fw_cfg;
+    return fw_cfg;
+}
+
 FWCfgState *pc_memory_init(MemoryRegion *system_memory,
                            const char *kernel_filename,
                            const char *kernel_cmdline,
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index d5066300a..1b3cd18e5 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -179,6 +179,13 @@ static void pc_init1(QEMUMachineInitArgs *args,
                        args->initrd_filename,
                        below_4g_mem_size, above_4g_mem_size,
                        rom_memory, &ram_memory, guest_info);
+    } else if (args->kernel_filename != NULL) {
+        /* For xen HVM direct kernel boot, load linux here */
+        fw_cfg = xen_load_linux(args->kernel_filename,
+                                args->kernel_cmdline,
+                                args->initrd_filename,
+                                below_4g_mem_size,
+                                guest_info);
     }
 
     gsi_state = g_malloc0(sizeof(*gsi_state));
diff --git a/hw/i386/xen/xen_apic.c b/hw/i386/xen/xen_apic.c
index 63bb7f77c..f5acd6a09 100644
--- a/hw/i386/xen/xen_apic.c
+++ b/hw/i386/xen/xen_apic.c
@@ -40,6 +40,7 @@ static void xen_apic_realize(DeviceState *dev, Error **errp)
 {
     APICCommonState *s = APIC_COMMON(dev);
 
+    s->vapic_control = 0;
     memory_region_init_io(&s->io_memory, OBJECT(s), &xen_apic_io_ops, s,
                           "xen-apic-msi", APIC_SPACE_SIZE);
 
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 9010246cb..b3ec56227 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -134,6 +134,11 @@ PcGuestInfo *pc_guest_info_init(ram_addr_t below_4g_mem_size,
 void pc_pci_as_mapping_init(Object *owner, MemoryRegion *system_memory,
                             MemoryRegion *pci_address_space);
 
+FWCfgState *xen_load_linux(const char *kernel_filename,
+                           const char *kernel_cmdline,
+                           const char *initrd_filename,
+                           ram_addr_t below_4g_mem_size,
+                           PcGuestInfo *guest_info);
 FWCfgState *pc_memory_init(MemoryRegion *system_memory,
                            const char *kernel_filename,
                            const char *kernel_cmdline,