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8156d48086
qemu/hw
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Gerd Hoffmann 8156d48086 pc: allow raising low memory via max-ram-below-4g option 
This patch extends the functionality of the max-ram-below-4g option
to also allow increasing lowmem.  Use case: Give as much memory as
possible to legacy non-PAE guests.

While being at it also rework the lowmem calculation logic and add a
longish comment describing how it works and what the compatibility
constrains are.

Note:  This is a incompatible change.  When setting max-ram-below-4g to
a value larger than 3.5G (or 3G with gigabyte alignment) it has no
effect on older qemu versions: qemu silently ignores it.  With the patch
applied it actually has an effect and changes the ram layout.  Highly
unlikely to hit in practive though as there is no reason start old qemu
versions that way.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <1464857305-26675-1-git-send-email-kraxel@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-06-06 18:57:06 +02:00
..
9pfs 9p: switch back to readdir() 2016-06-06 11:52:34 +02:00
acpi acpi: do not use TARGET_PAGE_SIZE 2016-05-19 16:42:28 +02:00
alpha alpha: include cpu-qom.h in files that require AlphaCPU 2016-05-19 16:42:27 +02:00
arm zynqmp: Add the ZCU102 board 2016-06-06 16:59:32 +01:00
audio hw/audio: QOM'ify milkymist-ac97.c 2016-06-03 11:13:38 +02:00
block dma-helpers: change interface to byte-based 2016-05-25 19:04:11 +02:00
bt bt: rewrite csrhci_write to avoid out-of-bounds writes 2016-05-29 09:11:11 +02:00
char hw/char: QOM'ify xilinx_uartlite model 2016-06-06 16:59:32 +01:00
core hw/ptimer: Introduce ptimer_get_limit 2016-06-06 16:59:31 +01:00
cpu explicitly include qom/cpu.h 2016-05-19 16:42:27 +02:00
cris hw/char: QOM'ify etraxfs_ser.c 2016-05-29 09:11:10 +02:00
display virtio-gpu: add live migration support 2016-06-06 09:04:34 +02:00
dma hw: explicitly include qemu/log.h 2016-05-19 16:42:29 +02:00
gpio hw: clean up hw/hw.h includes 2016-05-19 16:42:30 +02:00
i2c i2c: add aspeed i2c controller 2016-06-06 16:59:29 +01:00
i386 pc: allow raising low memory via max-ram-below-4g option 2016-06-06 18:57:06 +02:00
ide dma-helpers: change BlockBackend to opaque value in DMAIOFunc 2016-05-25 19:04:11 +02:00
input hw: explicitly include qemu/log.h 2016-05-19 16:42:29 +02:00
intc hw/intc/gic: RAZ/WI non-sec access to sec interrupts 2016-06-06 16:59:29 +01:00
ipack ipack: Update e-mail address 2016-05-18 15:04:27 +03:00
ipmi include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
isa explicitly include qom/cpu.h 2016-05-19 16:42:27 +02:00
lm32 hw/char: QOM'ify milkymist-uart.c 2016-05-29 09:11:10 +02:00
m68k hw: explicitly include qemu-common.h and cpu.h 2016-03-22 22:20:17 +01:00
mem include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
microblaze hw/char: QOM'ify xilinx_uartlite model 2016-06-06 16:59:32 +01:00
mips mips: use MIPSCPU instead of CPUMIPSState 2016-05-19 16:42:27 +02:00
misc memory: remove qemu_get_ram_fd, qemu_set_ram_fd, qemu_ram_block_host_ptr 2016-05-29 09:11:12 +02:00
moxie hw: explicitly include qemu-common.h and cpu.h 2016-03-22 22:20:17 +01:00
net e1000e: Fix build with gcc 4.6.3 and ust tracing 2016-06-06 09:42:54 +01:00
nvram vl: Replace DT_NOGRAPHIC with machine option 2016-05-20 14:28:54 -03:00
openrisc hw: explicitly include qemu-common.h and cpu.h 2016-03-22 22:20:17 +01:00
pci pcie: Introduce function for DSN capability creation 2016-06-02 10:42:26 +08:00
pci-bridge hw/pci-bridge: Add missing unref in case register-bus fails 2016-04-07 19:57:33 +03:00
pci-host hw: explicitly include qemu/log.h 2016-05-19 16:42:29 +02:00
pcmcia hw: Clean up includes 2016-01-29 15:07:25 +00:00
ppc ppc: Do some batching of TCG tlb flushes 2016-05-30 13:20:04 +10:00
s390x s390: use FILE instead of QEMUFile for creating text file 2016-05-26 11:31:05 +05:30
scsi scsi-disk: fix reads from scsi-disk devices 2016-06-06 13:23:41 +01:00
sd hw: explicitly include qemu/log.h 2016-05-19 16:42:29 +02:00
sh4 cpu: move exec-all.h inclusion out of cpu.h 2016-05-19 16:42:29 +02:00
smbios include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
sparc vl: Replace DT_NOGRAPHIC with machine option 2016-05-20 14:28:54 -03:00
sparc64 util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
ssi hw: explicitly include qemu/log.h 2016-05-19 16:42:29 +02:00
timer aspeed: include qemu/log.h 2016-05-20 13:09:22 +01:00
tpm tpm: Fix write to file descriptor function 2016-04-13 19:52:34 +03:00
tricore hw: explicitly include qemu-common.h and cpu.h 2016-03-22 22:20:17 +01:00
unicore32 hw: explicitly include qemu-common.h and cpu.h 2016-03-22 22:20:17 +01:00
usb usb/ohci: Fix crash with when specifying too many num-ports 2016-05-23 14:59:40 +02:00
vfio vfio: Check that IOMMU MR translates to system address space 2016-05-26 11:12:09 -06:00
virtio memory: split memory_region_from_host from qemu_ram_addr_from_host 2016-05-29 09:11:12 +02:00
watchdog nmi: remove x86 specific nmi handling 2016-05-23 16:53:46 +02:00
xen xen: write information about supported backends 2016-05-23 13:30:03 +02:00
xenpv xen: add pvUSB backend 2016-05-23 13:30:03 +02:00
xtensa qemu-common: push cpu.h inclusion out of qemu-common.h 2016-05-19 16:42:29 +02:00
Makefile.objs Add a base IPMI interface 2015-12-22 18:39:19 +02:00