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qemu/include/sysemu
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David Woodhouse d40ddd5290 hw/xen: Add xen_overlay device for emulating shared xenheap pages 
For the shared info page and for grant tables, Xen shares its own pages
from the "Xen heap" to the guest. The guest requests that a given page
from a certain address space (XENMAPSPACE_shared_info, etc.) be mapped
to a given GPA using the XENMEM_add_to_physmap hypercall.

To support that in qemu when *emulating* Xen, create a memory region
(migratable) and allow it to be mapped as an overlay when requested.

Xen theoretically allows the same page to be mapped multiple times
into the guest, but that's hard to track and reinstate over migration,
so we automatically *unmap* any previous mapping when creating a new
one. This approach has been used in production with.... a non-trivial
number of guests expecting true Xen, without any problems yet being
noticed.

This adds just the shared info page for now. The grant tables will be
a larger region, and will need to be overlaid one page at a time. I
think that means I need to create separate aliases for each page of
the overall grant_frames region, so that they can be mapped individually.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
2023-03-01 08:22:49 +00:00
..
accel-blocker.h accel: Clean up includes 2023-02-08 07:28:05 +01:00
accel-ops.h gdbstub: Use vaddr type for generic insert/remove_breakpoint() API 2023-02-27 22:29:01 +01:00
arch_init.h hw/loongarch: Add support loongson3 virt machine type. 2022-06-06 18:09:03 +00:00
balloon.h qapi: Restrict balloon-related commands to machine code 2020-09-29 15:41:35 +02:00
block-backend-common.h block-backend-common.h: split function pointers in BlockDevOps 2022-03-04 18:18:26 +01:00
block-backend-global-state.h block: Create no_co_wrappers for open functions 2023-02-17 11:22:19 +01:00
block-backend-io.h block: Mark bdrv_co_is_inserted() and callers GRAPH_RDLOCK 2023-02-23 19:49:25 +01:00
block-backend.h include/sysemu/block-backend: split header into I/O and global state (GS) API 2022-03-04 18:18:25 +01:00
block-ram-registrar.h block: add BlockRAMRegistrar 2022-10-26 14:56:42 -04:00
blockdev.h include/sysemu/blockdev.h: global state API 2022-03-04 18:18:25 +01:00
cpu-throttle.h cpu-throttle: new module, extracted from cpus.c 2020-07-10 18:04:49 -04:00
cpu-timers.h replay: notify vCPU when BH is scheduled 2022-06-06 09:26:53 +02:00
cpus.h exec: Remove unused 'qemu/timer.h' timer 2023-02-27 22:29:01 +01:00
cryptodev-vhost-user.h cryptodev: Fix Lesser GPL version number 2020-10-27 16:48:49 +01:00
cryptodev-vhost.h cryptodev: Fix Lesser GPL version number 2020-10-27 16:48:49 +01:00
cryptodev.h cryptodev: Add a lkcf-backend for cryptodev 2022-11-02 06:56:32 -04:00
device_tree.h device-tree: add re-randomization helper function 2022-10-27 11:34:31 +01:00
dirtylimit.h softmmu/dirtylimit: Implement virtual CPU throttle 2022-07-20 12:15:08 +01:00
dirtyrate.h include: Include headers where needed 2023-01-08 01:54:22 -05:00
dma.h hw/dma: Let dma_buf_read() / dma_buf_write() propagate MemTxResult 2022-01-18 12:56:29 +01:00
dump-arch.h dump: Add architecture section and section string table support 2022-10-24 22:30:10 +04:00
dump.h include: Include headers where needed 2023-01-08 01:54:22 -05:00
event-loop-base.h Don't include headers already included by qemu/osdep.h 2023-02-08 07:28:05 +01:00
hax.h accel/hax: Introduce CONFIG_HAX_IS_POSSIBLE 2022-03-06 13:15:42 +01:00
hostmem.h hostmem: Allow for specifying a ThreadContext for preallocation 2022-10-27 11:01:03 +02:00
hvf.h include/sysemu: Poison all accelerator CONFIG switches in common code 2021-05-14 12:31:44 +02:00
hvf_int.h arm/hvf: Add a WFI handler 2021-09-21 16:28:26 +01:00
hw_accel.h accel: Introduce AccelOpsClass::cpus_are_resettable() 2022-03-06 13:15:42 +01:00
iothread.h Introduce event-loop-base abstract class 2022-05-09 10:43:23 +01:00
kvm.h sysemu/kvm: Remove CONFIG_USER_ONLY guard 2023-02-27 22:29:01 +01:00
kvm_int.h i386/kvm: Add xen-version KVM accelerator property and init KVM Xen support 2023-03-01 08:22:49 +00:00
kvm_xen.h hw/xen: Add xen_overlay device for emulating shared xenheap pages 2023-03-01 08:22:49 +00:00
memory_mapping.h sysemu/memory_mapping: Become target-agnostic 2022-03-06 13:15:42 +01:00
numa.h numa: drop support for '-numa node' (without memory specified) 2020-09-30 19:09:20 +02:00
nvmm.h Only check CONFIG_NVMM when NEED_CPU_H is defined 2021-09-13 13:56:26 +02:00
os-posix.h block: move fcntl_setfl() 2022-05-03 15:17:53 +04:00
os-win32.h sysemu/os-win32: fix setjmp/longjmp on windows-arm64 2023-02-21 13:45:48 -10:00
qtest.h cpu-timers, icount: new modules 2020-10-05 16:41:22 +02:00
replay.h replay: Extract core API to 'exec/replay-core.h' 2023-02-27 22:29:01 +01:00
reset.h reset: allow registering handlers that aren't called by snapshot loading 2022-10-27 11:34:31 +01:00
rng-random.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
rng.h qom: Remove module_obj_name parameter from OBJECT_DECLARE* macros 2020-09-18 14:12:32 -04:00
rtc.h rtc: Move RTC function prototypes to their own header 2022-01-28 14:29:46 +00:00
runstate-action.h vl: Add option to avoid stopping VM upon guest panic 2020-12-15 12:51:58 -05:00
runstate.h whpx: Added support for breakpoints and stepping 2022-04-06 14:31:55 +02:00
seccomp.h sandbox: disable -sandbox if CONFIG_SECCOMP undefined 2018-06-01 13:44:15 +02:00
stats.h stats: Move QMP commands from monitor/ to stats/ 2023-02-04 07:56:54 +01:00
sysemu.h pci: Move HMP command from hw/pci/pcie_aer.c to pci-hmp-cmds.c 2022-12-19 16:21:56 +01:00
tcg.h accel/tcg: Merge tcg_exec_init into tcg_init_machine 2021-06-11 09:26:28 -07:00
tpm.h sysemu: tpm: Add a stub function for TPM_IS_CRB 2022-05-06 09:06:50 -06:00
tpm_backend.h sysemu: Make TPM structures inaccessible if CONFIG_TPM is not defined 2021-06-15 10:55:12 -04:00
tpm_util.h tpm: Fix Lesser GPL version number 2020-11-15 16:44:18 +01:00
vhost-user-backend.h qom: Remove module_obj_name parameter from OBJECT_DECLARE* macros 2020-09-18 14:12:32 -04:00
watchdog.h watchdog: remove -watchdog option 2022-09-29 11:40:28 +02:00
whpx.h include/sysemu: Poison all accelerator CONFIG switches in common code 2021-05-14 12:31:44 +02:00
xen-mapcache.h include: Make headers more self-contained 2019-08-16 13:31:51 +02:00
xen.h sysemu/xen: Add missing 'exec/cpu-common.h' header for ram_addr_t type 2020-09-30 19:11:36 +02:00