An error message can seen from the init-dom0less application on
direct-mapped 1:1 domains:
```
Allocating magic pages
memory.c:238:d0v0 mfn 0x39000 doesn't belong to d1
Error on alloc magic pages
```
This is because populate_physmap() automatically assumes gfn == mfn
for direct mapped domains. This cannot be true for the magic pages
that are allocated later for Dom0less DomUs from the init-dom0less
helper application executed in Dom0. For domain using statically
allocated memory but not 1:1 direct-mapped, similar error "failed to
retrieve a reserved page" can be seen as the reserved memory list
is empty at that time.
This series tries to fix this issue using a DOMCTL-based approach,
because for 1:1 direct-mapped domUs, we need to avoid the RAM regions
and inform the toolstack about the region found by hypervisor for
mapping the magic pages. The first 2 patches are simple clean-ups.
Patch 3 introduced a new DOMCTL to get the guest memory map, currently
only used for the magic page regions. Patch 4 uses the same approach
as finding the extended regions to find the guest magic page regions
for direct-mapped DomUs. Patch 5 makes the init-dom0less application
consume the DOMCTL to avoid hardcoding the guest magic base address.
Henry Wang (5):
xen/arm: Rename assign_static_memory_11() for consistency
xen/domain.h: Centrialize is_domain_direct_mapped()
xen/domctl, tools: Introduce a new domctl to get guest memory map
xen/arm: Find unallocated spaces for magic pages of direct-mapped domU
xen/memory, tools: Make init-dom0less consume XEN_DOMCTL_get_mem_map
tools/helpers/init-dom0less.c | 22 +++++++++---
tools/include/xenctrl.h | 4 +++
tools/libs/ctrl/xc_domain.c | 32 +++++++++++++++++
xen/arch/arm/dom0less-build.c | 45 +++++++++++++++++++++++-
xen/arch/arm/domain.c | 6 ++++
xen/arch/arm/domain_build.c | 30 ++++++++++------
xen/arch/arm/domctl.c | 19 +++++++++-
xen/arch/arm/include/asm/domain.h | 10 ++++--
xen/arch/arm/include/asm/domain_build.h | 2 ++
xen/arch/arm/include/asm/static-memory.h | 8 ++---
xen/arch/arm/static-memory.c | 5 +--
xen/arch/ppc/include/asm/domain.h | 2 --
xen/arch/riscv/include/asm/domain.h | 2 --
xen/arch/x86/include/asm/domain.h | 1 -
xen/common/memory.c | 10 ++++--
xen/include/public/arch-arm.h | 4 +++
xen/include/public/domctl.h | 21 +++++++++++
xen/include/public/memory.h | 5 +++
xen/include/xen/domain.h | 3 ++
xen/include/xen/mm.h | 2 ++
20 files changed, 201 insertions(+), 32 deletions(-)
--
2.34.1