All hardware with VT-d/AMD-Vi has CMPXCHG16B support. Check this at
initialisation time, and otherwise refuse to use the IOMMU.
If the local APICs support x2APIC mode the IOMMU support for interrupt
remapping will be checked earlier using a specific helper. If no support
for CX16 is detected by that earlier hook disable the IOMMU at that point
and prevent further poking for CX16 later in the boot process, which would
also fail.
There's a possible corner case when running virtualized, and the underlying
hypervisor exposing an IOMMU but no CMPXCHG16B support. In which case
ignoring the IOMMU is fine, albeit the most natural would be for the
underlying hypervisor to also expose CMPXCHG16B support if an IOMMU is
available to the VM.
Note this change only introduces the checks, but doesn't remove the now
stale checks for CX16 support sprinkled in the IOMMU code. Further changes
will take care of that.
Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Teddy Astie <teddy.astie@vates.tech>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
The MMIO cache is intended to have one entry used per independent memory
access that an insn does. This, in particular, is supposed to be
ignoring any page boundary crossing. Therefore when looking up a cache
entry, the access'es starting (linear) address is relevant, not the one
possibly advanced past a page boundary.
In order for the same offset-into-buffer variable to be usable in
hvmemul_phys_mmio_access() for both the caller's buffer and the cache
entry's it is further necessary to have the un-adjusted caller buffer
passed into there.
Fixes: 2d527ba310 ("x86/hvm: split all linear reads and writes at page boundary")
Reported-by: Manuel Andreas <manuel.andreas@tum.de>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Both caches may need higher capacity, and the upper bound will need to
be determined dynamically based on CPUID policy (for AMX'es TILELOAD /
TILESTORE at least).
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
To avoid overrunning the internal buffer we need to take the offset into
the buffer into account.
Fixes: d95da91fb4 ("x86/HVM: grow MMIO cache data size to 64 bytes")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Add a new randconfig job for each FreeBSD version. This requires some
rework of the template so common parts can be shared between the full and
the randconfig builds. Such randconfig builds are relevant because FreeBSD
is the only tested system that has a full non-GNU toolchain.
While there replace the usage of the python311 package with python3, which is
already using 3.11, and remove the install of the plain python package for full
builds.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-Acked-by: Oleksii Kurochko<oleksii.kurochko@gmail.com>
MISRA C Rule 20.7 states:
"Expressions resulting from the expansion of macro parameters shall
be enclosed in parentheses".
Document the behaviour of ECLAIR with respect to the CPP extension
that allows variable macro arguments to be named.
Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
The ssid_label field requires separate freeing; make sure to call
libxl_dominfo_dispose() as well as libxl_dominfo_init(). Since vcpuset()
calls only the former, add a call to the latter there at the same time.
Coverity-ID: 1638727
Coverity-ID: 1638728
Fixes: c458c404da ("xl: use libxl_domain_info to get the uuid in printf_info")
Fixes: 48dab9767d ("tools/xl: use libxl_domain_info to get domain type for vcpu-pin")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@vates.tech>
Release-Acked-by: Oleksii Kurochko<oleksii.kurochko@gmail.com>
The backend_domname field requires separate freeing; make sure to call
libxl_device_vtpm_dispose() also on respective error paths.
Coverity-ID: 1638719
Fixes: dde22055ac ("libxl: add vtpm support")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@vates.tech>
Release-Acked-By: Oleksii Kurochko <oleksii.kurochko@gmail.com>
While multiple -c options may be unexpected, we'd still better deal with
them properly.
Also restore the blank line that was bogusly zapped by the same commit.
Coverity-ID: 1638723
Fixes: e4ad283684 ("xentrace: Implement cpu mask range parsing of human values (-c)")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@vates.tech>
Release-Acked-by: Oleksii Kurochko<oleksii.kurochko@gmail.com>
public/arch-ppc.h contains two adjacent #ifndef __ASSEMBLY__ blocks.
With these merged, it becomes very obvious that there's a duplicate
definition of xen_ulong_t, which is also noticed by the docs build:
/usr/bin/perl -w /local/xen.git/docs/xen-headers -O html/hypercall/ppc \
-T 'arch-ppc - Xen public headers' \
-X arch-arm -X arch-riscv -X arch-x86_32 -X arch-x86_64 \
-X xen-arm -X xen-riscv -X xen-x86_32 -X xen-x86_64 \
-X arch-x86 \
/local/xen.git/docs/../xen include/public include/xen/errno.h
include/public/memory.h:63: multiple definitions of Typedef xen_ulong_t: include/public/arch-ppc.h:55
include/public/memory.h:63: multiple definitions of Typedef xen_ulong_t: include/public/arch-ppc.h:61
include/public/memory.h:63: multiple definitions of Typedef xen_ulong_t: include/public/arch-ppc.h:61
include/public/memory.h:63: multiple definitions of Typedef xen_ulong_t: include/public/arch-ppc.h:55
Drop the second typedef. Finally, annotate the #endif so it's clear
what it refers to.
Fixes: 08c192cc11 ("xen/ppc: Add public/arch-ppc.h")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Note I did not transplant the patterns under doc/txt/ (since the whole
dir is ignored already), and adjusted sort order to be fully
alphabetical.
Signed-off-by: Yann Dirson <yann.dirson@vates.tech>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
If randconfig enables coverage support the build times out due to GNU LD
taking too long. For the time being prevent coverage from being enabled in
clang randconfig job.
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>
Release-Acked-by: Oleksii Kurochko<oleksii.kurochko@gmail.com>
The EFI_GET_TIME implementation is well known to be broken for many firmware
implementations, for Xen the result on such implementations are:
----[ Xen-4.19-unstable x86_64 debug=y Tainted: C ]----
CPU: 0
RIP: e008:[<0000000062ccfa70>] 0000000062ccfa70
[...]
Xen call trace:
[<0000000062ccfa70>] R 0000000062ccfa70
[<00000000732e9a3f>] S 00000000732e9a3f
[<ffff82d04034f34f>] F arch/x86/time.c#get_cmos_time+0x1b3/0x26e
[<ffff82d04045926f>] F init_xen_time+0x28/0xa4
[<ffff82d040454bc4>] F __start_xen+0x1ee7/0x2578
[<ffff82d040203334>] F __high_start+0x94/0xa0
Pagetable walk from 0000000062ccfa70:
L4[0x000] = 000000207ef1c063 ffffffffffffffff
L3[0x001] = 000000005d6c0063 ffffffffffffffff
L2[0x116] = 8000000062c001e3 ffffffffffffffff (PSE)
****************************************
Panic on CPU 0:
FATAL PAGE FAULT
[error_code=0011]
Faulting linear address: 0000000062ccfa70
****************************************
Swap the preference to default to CMOS first, and EFI later, in an attempt to
use EFI_GET_TIME as a last resort option only. Note that Linux for example
doesn't allow calling the get_time method, and instead provides a dummy handler
that unconditionally returns EFI_UNSUPPORTED on x86-64.
Such change in the preferences requires some re-arranging of the function
logic, so that panic messages with workaround suggestions are suitably printed.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Acked-By: Oleksii Kurochko<oleksii.kurochko@gmail.com>
Release-Acked-by: Oleksii Kurochko<oleksii.kurochko@gmail.com>
Allow setting the used wallclock from the command line. When the option is set
to a value different than `auto` the probing is bypassed and the selected
implementation is used (as long as it's available).
The `xen` and `efi` options require being booted as a Xen guest (with Xen guest
supported built-in) or from UEFI firmware respectively.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Release-Acked-by: Oleksii Kurochko<oleksii.kurochko@gmail.com>
Rule 11.8 states as following: "A cast shall not remove any `const' or
`volatile' qualification from the type pointed to by a pointer".
Function `__hvm_copy' in `xen/arch/x86/hvm/hvm.c' is a double-use
function, where the parameter needs to not be const because it can be
set for write or not. As it was decided a new const-only function will
lead to more developer confusion than it's worth, this violation is
addressed by deviating the function.
All cases of casting away const-ness are accompanied with a comment
explaining why it is safe given the other flags passed in; such comment is used
by the deviation in order to match the appropriate function call.
No functional change.
Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@bugseng.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
This patch introduces a new XENMEM_access_r_pw permission.
Functionally, it is similar to XENMEM_access_r, but for processors
with TERTIARY_EXEC_EPT_PAGING_WRITE support (Intel 12th Gen/Alder Lake
and later, Xeon 4th Gen/Sappire Rapids and later), it also permits the
CPU to write to the page during guest page-table walks (e.g., updating
A/D bits) without triggering an EPT violation.
This behavior works by both enabling the EPT paging-write feature and
setting the EPT paging-write flag in the EPT leaf entry.
This feature provides a significant performance boost for
introspection tools that monitor guest page-table updates. Previously,
every page-table modification by the guest—including routine updates
like setting A/D bits—triggered an EPT violation, adding unnecessary
overhead. The new XENMEM_access_r_pw permission allows these
"uninteresting" updates to occur without EPT violations, improving
efficiency.
Additionally, this feature simplifies the handling of race conditions
in scenarios where an introspection tool:
- Sets an "invisible breakpoint" in the altp2m view for a function F.
- Monitors guest page-table updates to track whether the page
containing F is paged out.
- Encounters a cleared Access (A) bit on the page containing F while
the guest is about to execute the breakpoint.
In the current implementation:
- If xc_monitor_inguest_pagefault() is enabled, the introspection tool
must emulate both the breakpoint and the setting of the Access bit.
- If xc_monitor_inguest_pagefault() is disabled, Xen handles the EPT
violation without notifying the introspection tool, setting the
Access bit and emulating the instruction. However, Xen fetches the
instruction from the default view instead of the altp2m view,
potentially causing the breakpoint to be missed.
With this patch, setting XENMEM_access_r_pw for monitored guest
page-tables prevents EPT violations in these cases. This change
enhances performance and reduces complexity for introspection tools,
ensuring seamless breakpoint handling while tracking guest page-table
updates.
Signed-off-by: Petr Beneš <w1benny@gmail.com>
Acked-by: Tamas K Lengyel <tamas@tklengyel.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
The EPT Paging-write feature (when enabled by the
TERTIARY_EXEC_EPT_PAGING_WRITE bit) uses bit 58 of the EPT entry to
indicate that guest paging may update the page, even if the W access
is not set.
This patch is a preparation for the EPT Paging-write feature.
Signed-off-by: Petr Beneš <w1benny@gmail.com>
Acked-by: Tamas K Lengyel <tamas@tklengyel.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Use the solution described in [1] to provide a wrapper to the 'date'
command that uses SOURCE_DATE_EPOCH if available. This is needed for
reproducible builds.
The -d "@..." syntax was introduced in GNU date about 2005 (but only
added to the docuemntation in 2011), so I assume a version supporting
this syntax is available, if SOURCE_DATE_EPOCH is defined. If
SOURCE_DATE_EPOCH is not defined, nothing changes with respect to the
current behavior.
Update all users of 'date' in the tree to use the new wrapper.
[1] https://reproducible-builds.org/docs/source-date-epoch/
Signed-off-by: Maximilian Engelhardt <maxi@daemonizer.de>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Not having ppc and riscv included in DOC_ARCHES causes "multiple
definitions of ..." message on documentation build, similar to the
example shown below:
include/public/arch-ppc.h:91: multiple definitions of Typedef
vcpu_guest_core_regs_t: include/public/arch-arm.h:300
include/public/arch-ppc.h:91: multiple definitions of Typedef
vcpu_guest_core_regs_t: include/public/arch-ppc.h:85
It can also make the generated html documentation link to the header
files of another architecture. This is additionally a problem as it can
randomly make the documentation build non-reproducible.
Signed-off-by: Maximilian Engelhardt <maxi@daemonizer.de>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Commit a14593e399 ("xen/device-tree: Allow region overlapping with
/memreserve/ ranges") introduced a type in the 'struct membanks_hdr'
but forgot to update the 'struct kernel_info' initialiser, while
it doesn't lead to failures because the field is not currently
used while managing kernel_info structures, it's good to have it
for completeness.
There are other instance of structures using 'struct membanks_hdr'
that are dynamically allocated and don't fully initialise these
fields, provide a static inline helper for that.
Fixes: a14593e399 ("xen/device-tree: Allow region overlapping with /memreserve/ ranges")
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
Release-Acked-By: Oleksii Kurochko <oleksii.kurochko@gmail.com>
There is a possible race scenario between set_global_virq_handler()
and clear_global_virq_handlers() targeting the same domain, which
might result in that domain ending as a zombie domain.
In case set_global_virq_handler() is being called for a domain which
is just dying, it might happen that clear_global_virq_handlers() is
running first, resulting in set_global_virq_handler() taking a new
reference for that domain and entering in the global_virq_handlers[]
array afterwards. The reference will never be dropped, thus the domain
will never be freed completely.
This can be fixed by checking the is_dying state of the domain inside
the region guarded by global_virq_handlers_lock. In case the domain is
dying, handle it as if the domain wouldn't exist, which will be the
case in near future anyway.
Fixes: 87521589aa ("xen: allow global VIRQ handlers to be delegated to other domains")
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Clang 16 reports:
In file included from arch/arm/tee/ffa.c:72:
arch/arm/tee/ffa_private.h:329:17: error: 'used' attribute ignored on a non-definition declaration [-Werror,-Wignored-attributes]
extern uint32_t __ro_after_init ffa_fw_version;
^
The variable ffa_fw_version is only used in ffa.c. Remove the
declaration in the header and make the definition in ffa.c static.
Fixes: 2f9f240a5e ("xen/arm: ffa: Fine granular call support")
Signed-off-by: Stewart Hildebrand <stewart.hildebrand@amd.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
In the original patch e7a80636f1 ("xen/arm: add cache coloring support
for Xen image"), the stub was added under wrong assumption that DCE
won't remove the function call if it's not static. This assumption is
incorrect as we already rely on DCE for cases like this one. Therefore
drop the stub, that otherwise would be a place potentially prone to
errors in the future.
Suggested-by: Julien Grall <julien@xen.org>
Signed-off-by: Michal Orzel <michal.orzel@amd.com>
Reviewed-by: Luca Fancellu <luca.fancellu@arm.com>
Release-Acked-By: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Addition of FLASK permission for this hypercall was overlooked in the
original patch. Fix it. Setting LLC colors is only possible during domain
creation.
Fixes: 6985aa5e0c ("xen: extend domctl interface for cache coloring")
Signed-off-by: Michal Orzel <michal.orzel@amd.com>
Release-Acked-By: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Addition of FLASK permission for this hypercall was overlooked in the
original patch. Fix it. The only dt overlay operation is attaching that can
happen only after the domain is created. Dom0 can attach overlay to itself
as well.
Fixes: 4c733873b5 ("xen/arm: Add XEN_DOMCTL_dt_overlay and device attachment to domains")
Signed-off-by: Michal Orzel <michal.orzel@amd.com>
Release-Acked-By: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Addition of FLASK permission for this hypercall was overlooked in the
original patch. Fix it. The only VUART operation is initialization that
can occur only during domain creation.
Fixes: 86039f2e8c ("xen/arm: vpl011: Add a new domctl API to initialize vpl011")
Signed-off-by: Michal Orzel <michal.orzel@amd.com>
Release-Acked-By: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Daniel P. Smith <dpsmith@apertussolutions.com>
All selector fields under ctxt->regs are (normally) poisoned in the HVM
case, and the four ones besides CS and SS are potentially stale for PV.
Avoid using them in the hypervisor incarnation of the emulator, when
trying to cover for a missing ->read_segment() hook.
To make sure there's always a valid ->read_segment() handler for all HVM
cases, add a respective function to shadow code, even if it is not
expected for FPU insns to be used to update page tables.
Fixes: 0711b59b85 ("x86emul: correct FPU code/data pointers and opcode handling")
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
IOW we shouldn't raise #UD in that case. Be on the safe side though and
only encode fully legitimate forms into the stub to be executed.
Things weren't quite right for VCVT{,U}SI2SD either, in the attempt to
be on the safe side: Clearing EVEX.L'L isn't useful; it's EVEX.b which
primarily needs clearing. Also reflect the somewhat improved doc
situation in the comment there.
Fixes: ed806f3737 ("x86emul: support AVX512F legacy-equivalent packed int/FP conversion insns")
Fixes: baf4a376f5 ("x86emul: support AVX512F legacy-equivalent scalar int/FP conversion insns")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
The corresponding code in the Xen qemu repository was not applied from
qemu-xen-4.18.0.
Signed-off-by: James Dingwall <james@dingwall.me.uk>
Reviewed-by: Anthony PERARD <anthony.perard@vates.tech>
* Strip trailing whitspace.
* Remove PRIperfc. It has never been used and isn't useful.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
This is mostly for the removal of xen/lib.h and xen/smp.h from perfc.h. All
that is needed is xen/macros.h.
Trim and sort the includes for perfc.c too. There's no need for smp.h,
keyhandler.h or mm.h, but cpumask.h is needed.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
... and hook it up for RISC-V and PPC.
On RISC-V at least, no combination of headers pulls in errno.h, so include it
explicitly.
Guard the hypercalls array declaration based on NR_hypercalls existing. This
is sufficient to get PERF_COUNTERS fully working on RISC-V and PPC, so drop
the randconfig override.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Oleksii Kurohcko <oleksii.kurochko@gmail.com>
These were only ever used by the IA64 port, which was droped in commit
570c311ca2 ("remove ia64") in 2012.
Remove them, and clean up the arm/x86 stub headers.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Clang, of at least verion 17 complains:
arch/x86/pv/hypercall.c:30:10: error: variable 'eax' is used uninitialized
whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
30 | if ( !compat )
| ^~~~~~~
arch/x86/pv/hypercall.c:87:29: note: uninitialized use occurs here
87 | perfc_incra(hypercalls, eax);
| ^~~
This function is forced always_inline to cause compat to be
constant-propagated through, but that is only a heuristic to try and get the
compiler to do what we want, not a gurantee that it does.
Clang doesn't appear to be able to see that the only case where compat is
true (and therefore the if() is false) is when there's an else clause on the
end which sets eax too.
Initialise eax to -1, which ought to be optimised out, but if for whatever
reason it happens not to be, then perfc_incra() will fail it's bounds check
and do nothing.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Teddy Astie