[SeaBIOS] [PATCH seabios 1/3] kvmtool: initial support
Gerd Hoffmann
kraxel at redhat.com
Thu Nov 2 16:50:29 CET 2017
Add CONFIG_KVMTOOL config option.
kvmtool supports virtio only, so disable drivers
for all kinds of qemu emulated hardware and leave
only virtio-blk and virtio-scsi enabled.
Set rom default size to 128k.
Enable serial console for kvmtool.
Add ram detection.
Add pci devices scan.
Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
---
Makefile | 1 +
src/fw/paravirt.h | 3 +++
src/fw/paravirt.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
src/post.c | 4 +++-
src/sercon.c | 2 ++
src/Kconfig | 23 +++++++++++++++++++++--
6 files changed, 78 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile
index eb8ad583ae..6ea8e19ee7 100644
--- a/Makefile
+++ b/Makefile
@@ -92,6 +92,7 @@ endif
target-y :=
target-$(CONFIG_QEMU) += $(OUT)bios.bin
+target-$(CONFIG_KVMTOOL) += $(OUT)bios.bin
target-$(CONFIG_CSM) += $(OUT)Csm16.bin
target-$(CONFIG_COREBOOT) += $(OUT)bios.bin.elf
target-$(CONFIG_BUILD_VGABIOS) += $(OUT)vgabios.bin
diff --git a/src/fw/paravirt.h b/src/fw/paravirt.h
index a14d83e101..57ee0cfc4d 100644
--- a/src/fw/paravirt.h
+++ b/src/fw/paravirt.h
@@ -60,4 +60,7 @@ int qemu_cfg_write_file(void *src, struct romfile_s *file, u32 offset, u32 len);
int qemu_cfg_write_file_simple(void *src, u16 key, u32 offset, u32 len);
u16 qemu_get_romfile_key(struct romfile_s *file);
+void kvmtool_preinit(void);
+void kvmtool_platform_setup(void);
+
#endif
diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c
index 9674ab8ba8..0d4855e2e2 100644
--- a/src/fw/paravirt.c
+++ b/src/fw/paravirt.c
@@ -621,3 +621,51 @@ void qemu_cfg_init(void)
dprintf(1, "Moving pm_base to 0x%x\n", acpi_pm_base);
}
}
+
+void
+kvmtool_platform_setup(void)
+{
+ if (!CONFIG_KVMTOOL)
+ return;
+
+ pci_probe_devices();
+}
+
+void
+kvmtool_preinit(void)
+{
+ /*
+ * When started without firmware kvmtool creates a e820 map for
+ * the guest kernel. When started with "--firmware $file" it
+ * doesn't, so we have to figure.
+ *
+ * Detects only memory below 4G for now as we run in 32bit mode.
+ * For memory above 4G we would have to:
+ * (1) get hints from kvmtool somehow, or
+ * (2) enable paging, or
+ * (3) enter long mode.
+ *
+ * There is a 768M memory hole for I/O,
+ * see x86/include/kvm/kvm-arch.h in kvmtool.
+ */
+ static const u32 max_mb_32bit = 4096 - 768;
+ u32 mb, *ptr;
+
+ if (!CONFIG_KVMTOOL)
+ return;
+
+ for (mb = 16; mb < max_mb_32bit; mb++) {
+ ptr = (void*)(mb * 1024 * 1024 - 4);
+ *ptr = mb;
+ }
+ for (mb = 16; mb < max_mb_32bit; mb++) {
+ ptr = (void*)(mb * 1024 * 1024 - 4);
+ if (*ptr != mb)
+ break;
+ RamSize = mb * 1024 * 1024;
+ }
+
+ dprintf(1,"kvmtool: probed %d MB low RAM.\n",
+ RamSize / (1024 * 1024));
+ e820_add(0, RamSize, E820_RAM);
+}
diff --git a/src/post.c b/src/post.c
index f93106a1c9..f7268ecb8f 100644
--- a/src/post.c
+++ b/src/post.c
@@ -147,6 +147,7 @@ platform_hardware_setup(void)
// Platform specific setup
qemu_platform_setup();
+ kvmtool_platform_setup();
coreboot_platform_setup();
// Setup timers and periodic clock interrupt
@@ -307,6 +308,7 @@ dopost(void)
// Detect ram and setup internal malloc.
qemu_preinit();
+ kvmtool_preinit();
coreboot_preinit();
malloc_preinit();
@@ -320,7 +322,7 @@ dopost(void)
void VISIBLE32FLAT
handle_post(void)
{
- if (!CONFIG_QEMU && !CONFIG_COREBOOT)
+ if (!CONFIG_QEMU && !CONFIG_COREBOOT && !CONFIG_KVMTOOL)
return;
serial_debug_preinit();
diff --git a/src/sercon.c b/src/sercon.c
index 5d27051efb..0b7722ec08 100644
--- a/src/sercon.c
+++ b/src/sercon.c
@@ -517,6 +517,8 @@ void sercon_setup(void)
u16 addr;
addr = romfile_loadint("etc/sercon-port", 0);
+ if (!addr && CONFIG_KVMTOOL)
+ addr = 0x3f8;
if (!addr)
return;
dprintf(1, "sercon: using ioport 0x%x\n", addr);
diff --git a/src/Kconfig b/src/Kconfig
index 00108057d7..985594c51b 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -25,6 +25,11 @@ choice
Configure to be used by EFI firmware as Compatibility Support
module (CSM) to provide legacy BIOS services.
+ config KVMTOOL
+ bool "Build for kvmtool"
+ help
+ Configure for an emulated machine (kvmtool).
+
endchoice
config QEMU_HARDWARE
@@ -61,6 +66,7 @@ endchoice
Support an interactive boot menu at end of post.
config BOOTSPLASH
depends on BOOTMENU
+ depends on !KVMTOOL
bool "Graphical boot splash screen"
default y
help
@@ -124,6 +130,7 @@ endchoice
config ROM_SIZE
int "ROM size (in KB)"
+ default 128 if KVMTOOL
default 0
help
Set the ROM size. Say '0' here to make seabios figure the
@@ -138,6 +145,7 @@ endmenu
menu "Hardware support"
config ATA
depends on DRIVES
+ depends on !KVMTOOL
bool "ATA controllers"
default y
help
@@ -156,24 +164,26 @@ menu "Hardware support"
Use 32bit PIO accesses on ATA (minor optimization on PCI transfers).
config AHCI
depends on DRIVES
+ depends on !KVMTOOL
bool "AHCI controllers"
default y
help
Support for AHCI disk code.
config SDCARD
depends on DRIVES
+ depends on !KVMTOOL
bool "SD controllers"
default y
help
Support for SD cards on PCI host controllers.
config VIRTIO_BLK
- depends on DRIVES && QEMU_HARDWARE
+ depends on DRIVES && (QEMU_HARDWARE || KVMTOOL)
bool "virtio-blk controllers"
default y
help
Support boot from virtio-blk storage.
config VIRTIO_SCSI
- depends on DRIVES && QEMU_HARDWARE
+ depends on DRIVES && (QEMU_HARDWARE || KVMTOOL)
bool "virtio-scsi controllers"
default y
help
@@ -204,6 +214,7 @@ menu "Hardware support"
Support boot from qemu-emulated lsi53c895a scsi storage.
config MEGASAS
depends on DRIVES
+ depends on !KVMTOOL
bool "LSI MegaRAID SAS controllers"
default y
help
@@ -216,6 +227,7 @@ menu "Hardware support"
Support boot from LSI MPT Fusion scsi storage.
config FLOPPY
depends on DRIVES && HARDWARE_IRQ
+ depends on !KVMTOOL
bool "Floppy controller"
default y
help
@@ -229,6 +241,7 @@ menu "Hardware support"
QEMU fw_cfg.
config NVME
depends on DRIVES
+ depends on !KVMTOOL
bool "NVMe controllers"
default y
help
@@ -236,6 +249,7 @@ menu "Hardware support"
config PS2PORT
depends on KEYBOARD || MOUSE
+ depends on !KVMTOOL
bool "PS/2 port"
default y
help
@@ -243,6 +257,7 @@ menu "Hardware support"
config USB
bool "USB"
+ depends on !KVMTOOL
default y
help
Support USB devices.
@@ -355,6 +370,7 @@ menu "Hardware support"
Initialize the Memory Type Range Registers (on emulators).
config PMTIMER
bool "Support ACPI timer"
+ depends on !KVMTOOL
default y
help
Detect and use the ACPI timer for timekeeping.
@@ -404,6 +420,7 @@ menu "BIOS interfaces"
config OPTIONROMS
bool "Option ROMS"
default y
+ depends on !KVMTOOL
help
Support finding and running option roms during POST.
config PMM
@@ -466,6 +483,7 @@ menu "BIOS interfaces"
config TCGBIOS
depends on S3_RESUME
+ depends on !KVMTOOL
bool "TPM support and TCG BIOS extensions"
default y
help
@@ -493,6 +511,7 @@ menu "BIOS Tables"
sometimes called DMI.
config ACPI
bool "ACPI"
+ depends on !KVMTOOL
default y
help
Support generation of ACPI tables.
--
2.9.3
More information about the SeaBIOS
mailing list