xen/drivers/passthrough/arm/ipmmu-vmsa.c contains a git:// URL in a block
comment. This is also not an example of commented out code, so shouldn't be
considered a R3.1 violation.
Extend the regex to include git://, and swap hyperlink for URL in the
associated documentation to be more precise.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Michal Orzel <michal.orzel@amd.com>
Reviewed-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
When Cscope-ing through Xen, one occasionally finds themselves in
xen-hypercall-defs.h and needing to find the originating file.
This is substantially magic, and even reading the Makefile that produces
xen-hypercall-defs.h is of little help if you're not aware of of the %.i : %.c
pattern rule, and that the header is generated from a .c file in practice.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
As {alloc,free}_domain_struct() are used only within domain.c,
they can be declared static and their declarations removed
from xen/domain.h.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
alloc_vcpu_struct() and free_vcpu_struct() contain little
architecture-specific logic and are suitable for sharing across
architectures. Move both helpers to common code.
To support the remaining architectural differences, introduce
arch_vcpu_struct_memflags(), allowing architectures to override the
memory flags passed to alloc_xenheap_pages(). This is currently needed
by x86, which may require MEMF_bits(32) for HVM guests using shadow
paging.
The ARM implementation of alloc/free_vcpu_struct() is removed and
replaced by the common version. Stub implementations are also dropped
from PPC and RISC-V.
Now that the size of struct vcpu for Arm64 is smaller than PAGE_SIZE,
MAX_PAGES_PER_VCPU is no longer needed and is removed.
Finally, make alloc_vcpu_struct() and free_vcpu_struct() static to
common/domain.c, as they are no longer used outside common code.
No functional changes.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Michal Orzel <michal.orzel@amd.com>
When CONFIG_NEW_VGIC=y and CONFIG_ARM_64=y, the size of struct vcpu
exceeds one page, which requires allocating two pages and led to the
introduction of MAX_PAGES_PER_VCPU.
To remove the need for MAX_PAGES_PER_VCPU, the vgic member of NEW_VGIC's
struct vgic_cpu member private_irqs is changed to a pointer to struct
vgic_irq.
As a result, the size of struct vcpu for Arm64 is reduced to 2176 bytes
in the case when CONFIG_ARM_64=y and CONFIG_NEW_VGIC=y, compared to 3840
bytes (without these changes and with CONFIG_ARM_64=y) and 4736 bytes
(without these changes and with both CONFIG_ARM_64=y and CONFIG_NEW_VGIC=y).
Note that all numbers are based on defconfig with the mentioned options
enabled or disabled as specified.
Since the private_irqs member is now a pointer, vcpu_vgic_init() and
vcpu_vgic_free() are updated to allocate and free private_irqs instance.
As struct vcpu now fits into one page, drop MAX_PAGES_PER_VCPU.
Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Michal Orzel <michal.orzel@amd.com>
In an attempt to debug/workaround occasional console freeze, switch it
to polling mode. If that helps, it will narrow down the search.
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
There is consensus towards using more binary literals in Xen,
so they are enabled both for X86_64 and ARM64.
Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Its sole caller is, and the wrong annotation would cause a build failure
(non-empty .text) if the compiler chose to not inline the function when at
the same time LATE_HWDOM=y.
Fixes: be52cb139f ("x86/mmcfg: add handlers for the PVH Dom0 MMCFG areas")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
The current logic splits the update of the amount of available memory in
the system (total_avail_pages) and pending claims into two separately
locked regions. This leads to a window between counters adjustments where
the result of total_avail_pages - outstanding_claims doesn't reflect the
real amount of free memory available, and can return a negative value due
to total_avail_pages having been updated ahead of outstanding_claims.
Fix by adjusting outstanding_claims and d->outstanding_pages in the same
place where total_avail_pages is updated. Note that accesses to
d->outstanding_pages is protected by the global heap_lock, just like
total_avail_pages or outstanding_claims. Add a comment to the field
declaration, and also adjust the comment at the top of
domain_set_outstanding_pages() to be clearer in that regard.
Note that failures in assign_pages() causes the claimed amount that has
been allocated to be lost, as the amount is not added back to the domain
quota once pages are freed. Given the intended usage of claims is limited
to initial physmap populate, and the current failure paths in
assign_pages() would lead to the domain being destroyed anyway, don't
add extra logic to recover the claimed amount on failure - it's just adding
complexity for no real benefit.
Fixes: 65c9792df6 ("mmu: Introduce XENMEM_claim_pages (subop of memory ops)")
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
XENMAPSPACE_gmfn{_range} allows moving gfn around the guest p2m: the mfn
behind the source gfn is zapped from the origin and mapped at the
requested destination gfn. The destination p2m entries are always created
with type p2m_ram_rw.
With the current checking done in xenmem_add_to_physmap_one() it's possible
to use XENMAPSPACE_gmfn{_range} to change the type of a p2m entry. The
source gfn is only checked to be not shared, and that the underlying page
is owned by the domain.
Make the source checks more strict, by checking that the source gfn is of
type read/write RAM or logdirty. That prevents the operation from
inadvertently changing the type as part of the move.
Fixes: 3e50af3d87 ("New XENMAPSPACE_gmfn parameter for XENMEM_add_to_physmap.")
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Use appropriate types for the control register value as well as the
capability position. Constify a pointer. Use "else" in favor of encoding
the opposite condition of the earlier if().
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
All call sites pass it using the flag from the IOMMU which they also
pass.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
..., thus allowing them to become static. There's nothing x86-specific
about these functions anyway.
Since only the "iommu_inclusive_mapping" parameter declaration would be
left in the file, move that as well. There's nothing VT-d specific about
it (anymore?): "dom0-iommu=map-inclusive" is similarly generic, and
documentation also doesn't say anything.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
..., thus allowing it and qinval_device_iotlb_sync() to become static.
There's nothing x86-specific about the function anyway. While moving,
adjust types to better match ./CODING_STYLE (albeit use of fixed-width
types for parameters is retained to limit the effective change).
Append a UL to a constant while moving, to please Misra. Also insert
blank lines in the switch(), between non-fall-through case blocks.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
..., thus allowing it to become static, and thus reducing scope overlap
between it and pci_ats_device(). There's nothing x86-specific about this
function anyway.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
All callers only care about boolean outcome. For this there's no point
in allocating a duplicate of the respective DRHD structure; a simple
boolean suffices (which eventually may want to become a count, such that
the "any ATS devices assigned state" can also clear again). With that
boolean, remove respective parameters from internal helper functions
right away, as those have access to the flag through another parameter.
(While the corresponding hook can have the parameter dropped too then,
leave this for a separate change, to limit scope here.)
No functional effect intended.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Switch the current version to 15.0-RELEASE. Sadly the 16 snapshot images
are not working, hence use the FREEBSD_CURRENT variable as a placeholder
for 15.0 until the issues with FreeBSD 16.0 snapshot images is solved.
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Introduce an additional memflags field to the xc_dom_image and
xc_sr_context structures and use it to pass additional memflags to use when
populating the domain physmap.
No meaningful usages of this new field are added as part of the patch. The
only know usage will be from the XAPI domain builder, which lives in a
different repository.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@vates.tech>
The coloring allocator ignores claims; reject the usage of the hypercall if
LLC coloring is enabled. Note that the usage of alloc_color_heap_page() is
selected at boot time, and it's a system wide decision. Once enabled all
domains will use alloc_color_heap_page() for allocations, which ignores any
outstanding claims.
The hypercall can be enabled if/when LLC coloring is adjusted to support
claims.
Fixes: 95debe51a9 ("xen: add cache coloring allocator for domains")
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
... on x86, to make sure its bit-rotting can be limited at least a little.
Since on Ubuntu fread()'s return value needs evaluating, adjust the code
there to also skip the test when there's no data at all.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Zen2 (which doesn't expose ERMS) through Zen4 have sub-optimal aliasing
detection for REP MOVS, and fall back to a unit-at-a-time loop when the
two pointers have differing bottom 5 bits. While both forms are
affected, this makes REP MOVSB 8 times slower than REP MOVSQ.
memcpy() has a high likelihood of encountering this slowpath, so avoid
using REP MOVSB. This undoes the ERMS optimisation added in commit
d6397bd0e1 which turns out to be an anti-optimisation on these
microarchitectures.
However, retain the use of ERMS-based REP MOVSB in other cases such as
copy_page_hot() where there parameter alignment is known to avoid the
slowpath.
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Having an #ifdef CONFIG_X86 section in a common library is rude.
Furthermore, for x86 the main logic is 6 bytes, meaning it's ripe for
inlining. Create an x86-specific asm/muldiv.h implementing arch_muldiv64().
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
muldiv64() has 7 users across all architectures, and is limited to time
handling functions. Therefore, move it's declaration out of lib.h into a
dedicated header.
Rename the library function to generic_muldiv64(), as x86 is going to provide
an arch_muldiv64() in a subsequent change.
Explain what the function does, including the limitations; x86's version will
suffer a divide error rather than truncate the result to 64 bits.
Annotate it with attr_const, not that this allows the optimiser to improve any
of Xen's current users. Add one selftest to check the internal precision,
putting it in bitops.c for want of any better place to put it.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Michal Orzel <michal.orzel@amd.com>
WORDS_BIGENDIAN is a QEMU-ism. In the very dim and distant past, we had a
fork of QEMU living in xen.git which wired WORDS_BIGENDIAN in the userspace
part of the build, but nothing ever wired it up in the hypervisor build.
Fixes: 86d5da49a6 ("[HVM] Support multiple HVM time device models coming soon.")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Add support of virtual SBI base extension calls for RISC-V guests, delegating
hardware-specific queries to the underlying SBI and handling version and
firmware ID queries directly.
The changes include:
1. Define new SBI base extension function IDs (SBI_EXT_BASE_GET_MVENDORID,
SBI_EXT_BASE_GET_MARCHID, SBI_EXT_BASE_GET_MIMPID).
2. Introduce XEN_SBI_VER_MAJOR, XEN_SBI_VER_MINOR for imeplenataion of
SBI_EXT_BASE_GET_SPEC_VERSION.
4. Introduce SBI_XEN_IMPID to implement SBI_EXT_BASE_GET_IMP_ID.
5. Implement handling of SBI base extension functions, including version,
firmware ID, and machine-specific queries.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Use XFREE() instead of xfree() so that vcpu_vgic_free() can be idempotent.
With XFREE(), vgic_vcpu->private_irqs is set to NULL, so calling
vcpu_vgic_free() a second time is not an issue.
Update the prototype of vcpu_vgic_free() to return void to satisfy MISRA
Rule 17.7, since the return value of vcpu_vgic_free() is not used by any
callers.
Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Michal Orzel <michal.orzel@amd.com>
Replace the remaining symlink-ing (of test harness and core emulator
files) as well, to avoid mixing approaches. This way various explicit
dependencies can also go away.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Replace the remaining non-local symlink-ing (i.e. of core emulator files)
as well, to avoid mixing approaches. (The symlink-ing of test blob sources
needs to remain for the time being.)
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
MISRA C Rule 17.1 prohibits the use of the features that support
variadic functions. Make the deviation already in place for controlled
use of such features more general, relying on the presence of the
`format' attribute on the function declaration.
Add attributes where missing in order to avoid special-casing
certain functions that use variadic arguments.
Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Force ThumbEE support to not available in the version of the PFR0
register value we present to guest.
Xen does not support ThumbEE and will trap all access to ThumbEE
registers so do not report it being supported if the hardware supports
it.
Fixes: 5bbe1fe413 ("ARM: Drop ThumbEE support")
Signed-off-by: Bertrand Marquis <bertrand.marquis@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
Reviewed-by: Luca Fancellu <luca.fancellu@arm.com>
Tested-by: Luca Fancellu <luca.fancellu@arm.com>
set_guest_*_trapbounce() are only called from assembly so gain asmlinkage to
identify them.
xen_msr_s_cet_value() is called by assembly and C, so asmlinkage isn't
appropriate. Make the declaration unconditional, which silences the
complaint.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
These are mostly name mismatches, but a couple have type alias mismatches too.
For shadow_put_top_level() and is_patch(), the declaration name is the better
choice so change the name in the function.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
The automatically generated hypercall dispatch logic looks like:
case __HYPERVISOR_update_descriptor: \
ret = do_update_descriptor((uint64_t)(a1), (seg_desc_t)(a2)); \
break; \
but seg_desc_t is a union and Eclair considers this to be a violation of MISRA
Rule 1.1. There's also a Rule 8.3 violation for the parameter name mismatch.
Instead of playing games trying to change seg_desc_t to be a struct, or to
alter the AWK generator to know that seg_desc_t is magic and needs braces
rather than brackets, just switch the type to be a plain uint64_t.
The size is fixed by the x86 architecture, so it is never going to change.
This even lets us simplify compat_update_descriptor() a little.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
MISRA doesn't like mixing hexadecimal escape sequences with ASCII text. Use
the same workaround as in commit cd50483537 ("xen: address MISRA C:2012 Rule
4.1").
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
I haven't been actively reviewing Xen RISC-V patches for several years,
so remove myself from the reviewer list to better reflect the current
reality. The RISC-V port has come a long way thanks to Oleksii, current
contributors, and maintainers, and it has been exciting to see. Many
thanks to everyone, I hope we cross paths again in the future!
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Add support for legacy SBI extensions (version 0.1) in Xen for guest
domains.
The changes include:
1. Define all legacy SBI extension IDs (0x0 to 0x8) for better clarity and
completeness.
2. Implement handling of legacy SBI extensions, starting with support for
SBI_EXT_0_1_CONSOLE_PUTCHAR. SBI_EXT_0_1_CONSOLE_GETCHAR is marked as
not supported as legacy SBI console related stuff is expected to be used
only for early debugging of guest.
The implementation uses the existing virtual SBI framework to handle legacy
SBI ecalls, ensuring compatibility with older SBI specifications in
RISC-V guests.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Introduce support for handling virtual SBI extensions in Xen.
The changes include:
- Added new vsbi/core.c and vsbi.h files to implement virtual SBI extension
handling.
- Modified traps.c to handle CAUSE_VIRTUAL_SUPERVISOR_ECALL by calling
vsbi_handle_ecall() when the trap originates from VS-mode.
- Updated xen.lds.S to include a new .vsbi.exts section for virtual SBI
extension data.
- Updated Makefile to include the new vsbi/ directory in the build.
- Add hstatus register to struct cpu_user_regs as it is needed for
a check that CAUSE_VIRTUAL_SUPERVISOR_ECALL happens from VS-mode.
Also, add storing/restoring of hstatus register in handle_trap().
- Introduce vsbi_find_extension() to check if vsbi extension is supported
by Xen. For now it is called only inside vsbi/core.c, but in future
it is going to be called from other files.
- Introduce check_vsbi_ext_ranges() to check if there EIDs ranges
overlapping between extensions.
The implementation allows for registration and handling of SBI
extensions via a new vsbi_ext structure and ".vsbi.exts" section,
enabling extensible virtual SBI support for RISC-V guests.
Note: All EIDs are printed in the format #%#lx and all FIDs in #%lu, as
the SBI spec uses these formats. Printing them this way makes it easier
to search for them in the SBI spec.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Calling a function with 10 arguments is inefficient on many architectures:
x86-64 allows for up to 6 register parameters, Arm64 for up to 8.
Everything else needs passing on the stack, i.e. forcing the compiler to
emit stack manipulation insns at every call site.
Shrinks generated code on x86 (with gcc15) by over 250 bytes. The gains on
Arm64 are a little less.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stewart Hildebrand <stewart.hildebrand@amd.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Legacy PCI devices don't have any extended config space. Reading any part
thereof may very well return all ones. That then necessarily means we
would think we found a "loop", when there simply is nothing.
Fixes: a845b50c12 ("vpci/header: Emulate extended capability list for dom0")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
QEMU used to ignore JSON types and do conversion string <-> integer
automatically for the command "device_add", but that was removed in
QEMU 9.2 (428d1789df91 ("docs/about: Belatedly document tightening of
QMP device_add checking")).
Fixes: 9718ab394d ("libxl_usb: Make libxl__device_usbctrl_add uses ev_qmp")
Fixes: 40c7eca10a ("libxl_usb: Make libxl__device_usbdev_add uses ev_qmp")
Signed-off-by: Anthony PERARD <anthony.perard@vates.tech>
Tested-by: Maximilian Engelhardt <maxi@daemonizer.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
`docker:stable` tag hasn't been updated in 5 years, and has been
deprecated, according to https://hub.docker.com/_/docker, while
`docker:dind` (image use for the service) is using a recent version of
docker.
Now, `docker info` fails with:
Error response from daemon: client version 1.40 is too old. ...
Switch to a newer tag, and just the "cli" version which contains only
the docker client. With that, both `:dind` and `:cli` should keep
using the same version of version. (`:cli` seems to be the base image
used to build `:dind`.)
Signed-off-by: Anthony PERARD <anthony.perard@vates.tech>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Implement the mfn_valid() macro to verify whether a given MFN is valid by
checking that it falls within the range [start_page, max_page).
These bounds are initialized based on the start and end addresses of RAM.
As part of this patch, start_page is introduced and initialized with the
PFN of the first RAM page.
Also, initialize pdx_group_valid() by calling set_pdx_range() when
memory banks are being mapped.
Also, after providing a non-stub implementation of the mfn_valid() macro,
the following compilation errors started to occur:
riscv64-linux-gnu-ld: prelink.o: in function `alloc_heap_pages':
/build/xen/common/page_alloc.c:1054: undefined reference to `page_is_offlinable'
riscv64-linux-gnu-ld: /build/xen/common/page_alloc.c:1035: undefined reference to `page_is_offlinable'
riscv64-linux-gnu-ld: prelink.o: in function `reserve_offlined_page':
/build/xen/common/page_alloc.c:1151: undefined reference to `page_is_offlinable'
riscv64-linux-gnu-ld: ./.xen-syms.0: hidden symbol `page_is_offlinable' isn't defined
riscv64-linux-gnu-ld: final link failed: bad value
make[2]: *** [arch/riscv/Makefile:28: xen-syms] Error 1
To resolve these errors, the following functions have also been introduced,
based on their Arm counterparts:
- page_get_owner_and_reference() and its variant to safely acquire a
reference to a page and retrieve its owner.
- Implement page_is_offlinable() to return false for RISC-V.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Implement put_page(), as it will be used by p2m_put_*-related code.
Although CONFIG_STATIC_MEMORY has not yet been introduced for RISC-V,
a stub for PGC_static is added to avoid cluttering the code of
put_page() with #ifdefs.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Add support for down large memory mappings ("superpages") in the RISC-V
p2m mapping so that smaller, more precise mappings ("finer-grained entries")
can be inserted into lower levels of the page table hierarchy.
To implement that the following is done:
- Introduce p2m_split_superpage(): Recursively shatters a superpage into
smaller page table entries down to the target level, preserving original
permissions and attributes.
- p2m_set_entry() updated to invoke superpage splitting when inserting
entries at lower levels within a superpage-mapped region.
This implementation is based on the ARM code, with modifications to the part
that follows the BBM (break-before-make) approach, some parts are simplified
as according to RISC-V spec:
It is permitted for multiple address-translation cache entries to co-exist
for the same address. This represents the fact that in a conventional
TLB hierarchy, it is possible for multiple entries to match a single
address if, for example, a page is upgraded to a superpage without first
clearing the original non-leaf PTE’s valid bit and executing an SFENCE.VMA
with rs1=x0, or if multiple TLBs exist in parallel at a given level of the
hierarchy. In this case, just as if an SFENCE.VMA is not executed between
a write to the memory-management tables and subsequent implicit read of the
same address: it is unpredictable whether the old non-leaf PTE or the new
leaf PTE is used, but the behavior is otherwise well defined.
In contrast to the Arm architecture, where BBM is mandatory and failing to
use it in some cases can lead to CPU instability, RISC-V guarantees
stability, and the behavior remains safe — though unpredictable in terms of
which translation will be used.
Additionally, the page table walk logic has been adjusted, as ARM uses the
opposite level numbering compared to RISC-V.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Implement the p2m_next_level() function, which enables traversal and dynamic
allocation of intermediate levels (if necessary) in the RISC-V
p2m (physical-to-machine) page table hierarchy.
To support this, the following helpers are introduced:
- page_to_p2m_table(): Constructs non-leaf PTEs pointing to next-level page
tables with correct attributes.
- p2m_alloc_page(): Allocates page table pages, supporting both hardware and
guest domains.
- p2m_create_table(): Allocates and initializes a new page table page and
installs it into the hierarchy.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
This patch adds the initial logic for constructing PTEs from MFNs in the RISC-V
p2m subsystem. It includes:
- Implementation of p2m_pte_from_mfn(): Generates a valid PTE using the
given MFN, p2m_type_t, including permission encoding and PBMT attribute
setup.
- New helper p2m_set_permission(): Encodes access rights (r, w, x) into the
PTE based on both p2m type and access permissions.
- p2m_set_type(): Stores the p2m type in PTE's bits. The storage of types,
which don't fit PTE bits, will be implemented separately later.
- Add detection of Svade extension to properly handle a possible page-fault
if A and D bits aren't set.
PBMT type encoding support:
- Introduces an enum pbmt_type_t to represent the PBMT field values.
- Maps types like p2m_mmio_direct_dev to p2m_mmio_direct_io, others default
to pbmt_pma.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
This patch introduces a working implementation of p2m_free_subtree() for RISC-V
based on ARM's implementation of p2m_free_entry(), enabling proper cleanup
of page table entries in the P2M (physical-to-machine) mapping.
Only few things are changed:
- Introduce and use p2m_get_type() to get a type of p2m entry as
RISC-V's PTE doesn't have enough space to store all necessary types so
a type is stored outside PTE. But, at the moment, handle only types
which fit into PTE's bits.
Key additions include:
- p2m_free_subtree(): Recursively frees page table entries at all levels. It
handles both regular and superpage mappings and ensures that TLB entries
are flushed before freeing intermediate tables.
- p2m_put_page() and helpers:
- p2m_put_4k_page(): Clears GFN from xenheap pages if applicable.
- p2m_put_2m_superpage(): Releases foreign page references in a 2MB
superpage.
- p2m_get_type(): Extracts the stored p2m_type from the PTE bits.
- p2m_free_page(): Returns a page to a domain's freelist.
- Introduce p2m_is_foreign() and connected to it things.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Andrew Cooper