Roger Pau Monne 659019909b x86/xen: attempt to inflate the memory balloon on PVH ... [ Upstream commit 38620fc4e8 ] When running as PVH or HVM Linux will use holes in the memory map as scratch space to map grants, foreign domain pages and possibly miscellaneous other stuff. However the usage of such memory map holes for Xen purposes can be problematic. The request of holesby Xen happen quite early in the kernel boot process (grant table setup already uses scratch map space), and it's possible that by then not all devices have reclaimed their MMIO space. It's not unlikely for chunks of Xen scratch map space to end up using PCI bridge MMIO window memory, which (as expected) causes quite a lot of issues in the system. At least for PVH dom0 we have the possibility of using regions marked as UNUSABLE in the e820 memory map. Either if the region is UNUSABLE in the native memory map, or it has been converted into UNUSABLE in order to hide RAM regions from dom0, the second stage translation page-tables can populate those areas without issues. PV already has this kind of logic, where the balloon driver is inflated at boot. Re-use the current logic in order to also inflate it when running as PVH. onvert UNUSABLE regions up to the ratio specified in EXTRA_MEM_RATIO to RAM, while reserving them using xen_add_extra_mem() (which is also moved so it's no longer tied to CONFIG_PV). [jgross: fixed build for CONFIG_PVH without CONFIG_XEN_PVH] Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20240220174341.56131-1-roger.pau@citrix.com Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-04-13 13:10:10 +02:00
..
events	xen/events: increment refcnt only if event channel is refcounted	2024-03-26 18:17:34 -04:00
xen-pciback	xen-pciback: Consider INTx disabled when MSI/MSI-X is enabled	2023-10-16 15:20:31 +02:00
xenbus	xen/xenbus: document will_handle argument for xenbus_watch_path()	2024-02-12 18:03:14 +01:00
xenfs
acpi.c
arm-device.c
balloon.c	x86/xen: attempt to inflate the memory balloon on PVH	2024-04-13 13:10:10 +02:00
biomerge.c
cpu_hotplug.c
dbgp.c
efi.c
evtchn.c	xen/evtchn: avoid WARN() when unbinding an event channel	2024-03-26 18:17:34 -04:00
features.c
gntalloc.c	xen/gntalloc: Replace UAPI 1-element array	2024-02-13 09:06:48 +01:00
gntdev-common.h
gntdev-dmabuf.c	xen/gntdev: Fix the abuse of underlying struct page in DMA-buf import	2024-01-10 07:32:40 +01:00
gntdev-dmabuf.h
gntdev.c
grant-dma-iommu.c
grant-dma-ops.c
grant-table.c	locking/atomic, xen: Use sync_try_cmpxchg() instead of sync_cmpxchg()	2023-10-09 18:14:34 +02:00
Kconfig	xen: privcmd: Add support for ioeventfd	2023-10-16 15:18:33 +02:00
Makefile
manage.c
mcelog.c
mem-reservation.c
pci.c
pcpu.c	xen: pcpu: make xen_pcpu_subsys const	2024-02-13 09:03:31 +01:00
platform-pci.c
privcmd-buf.c
privcmd.c	xen/privcmd: Use memdup_array_user() in alloc_ioreq()	2024-02-13 08:58:21 +01:00
privcmd.h
pvcalls-back.c
pvcalls-front.c
pvcalls-front.h
swiotlb-xen.c	swiotlb-xen: provide the "max_mapping_size" method	2023-11-17 10:45:46 +01:00
sys-hypervisor.c
time.c
unpopulated-alloc.c
xen-acpi-pad.c
xen-acpi-processor.c
xen-balloon.c	xen: balloon: make balloon_subsys const	2024-02-13 09:03:34 +01:00
xen-front-pgdir-shbuf.c	xen/shbuf: eliminate 17 kernel-doc warnings	2023-11-13 08:14:42 +01:00
xen-scsiback.c	scsi: target: Have drivers report if they support direct submissions	2023-10-13 15:53:57 -04:00
xlate_mmu.c