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[Qemu-devel] [RFC PATCH V4 2/2] qemu: support xen hvm direct kernel boot
From: |
Chunyan Liu |
Subject: |
[Qemu-devel] [RFC PATCH V4 2/2] qemu: support xen hvm direct kernel boot |
Date: |
Tue, 1 Jul 2014 15:06:01 +0800 |
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 <address@hidden>
---
Changes to v3:
- add assertion before adding option rom as Stefan suggests
hw/i386/pc.c | 25 +++++++++++++++++++++++++
hw/i386/pc_piix.c | 7 +++++++
hw/i386/xen/xen_apic.c | 1 +
include/hw/i386/pc.h | 5 +++++
4 files changed, 38 insertions(+)
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 2cf22b1..9e58982 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1190,6 +1190,31 @@ 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(MachineState *machine,
MemoryRegion *system_memory,
ram_addr_t below_4g_mem_size,
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 2dccb34..63e2198 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -180,6 +180,13 @@ static void pc_init1(MachineState *machine,
fw_cfg = pc_memory_init(machine, system_memory,
below_4g_mem_size, above_4g_mem_size,
rom_memory, &ram_memory, guest_info);
+ } else if (machine->kernel_filename != NULL) {
+ /* For xen HVM direct kernel boot, load linux here */
+ fw_cfg = xen_load_linux(machine->kernel_filename,
+ machine->kernel_cmdline,
+ machine->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 63bb7f7..f5acd6a 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 1c0c382..b47aaa9 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -187,6 +187,11 @@ 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(MachineState *machine,
MemoryRegion *system_memory,
ram_addr_t below_4g_mem_size,
--
1.8.4.5