Commit 37f074a338 ("x86/msr: introduce guest_rdmsr()") introduced a
function to combine the MSR_READ handling between PV and HVM.
Unfortunately, by returning directly, it skipped the trace generation,
leading to gaps in the trace record, as well as xenalyze errors like
this:
hvm_generic_postprocess: d2v0 Strange, exit 7c(VMEXIT_MSR) missing a handler
Replace the `return` with `goto out`.
Fixes: 37f074a338 ("x86/msr: introduce guest_rdmsr()")
Signed-off-by: George Dunlap <george.dunlap@cloud.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
As now we got a separate config option for VMX which itself depends on
CONFIG_HVM, we need to use it to provide vmx_pi_hooks_{assign,deassign}
stubs for case when VMX is disabled while HVM is enabled.
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
The symbol svm_stgi_label is AMD-V specific so guard its usage in common code
with CONFIG_AMD_SVM.
Since SVM depends on HVM, it can be used alone.
Also, use #ifdef instead of #if.
No functional change intended.
Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Replace cpu_has_svm check with using_svm(), so that not only SVM support in CPU
is being checked at runtime, but also at build time we ensure the availability
of functions svm_load_segs() and svm_load_segs_prefetch().
Since SVM depends on HVM, it can be used alone.
Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Replace cpu_has_vmx check with using_vmx(), so that not only VMX support in CPU
is being checked at runtime, but also at build time we ensure the availability
of functions vmx_vmcs_enter() & vmx_vmcs_exit().
Also since CONFIG_VMX is checked in using_vmx and it depends on CONFIG_HVM,
we can drop #ifdef CONFIG_HVM lines around using_vmx.
Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Replace cpu_has_vmx check with using_vmx(), so that DCE would remove calls
to functions ept_p2m_init() and ept_p2m_uninit() on non-VMX build.
Since currently Intel EPT implementation depends on CONFIG_INTEL_VMX config
option, when VMX is off these functions are unavailable.
Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
As we now have AMD_SVM/INTEL_VMX config options for enabling/disabling these
features completely in the build, we need some build-time checks to ensure that
vmx/svm code can be used and things compile. Macros cpu_has_{svm,vmx} used to be
doing such checks at runtime, however they do not check if SVM/VMX support is
enabled in the build.
Also cpu_has_{svm,vmx} can potentially be called from non-{VMX,SVM} build
yet running on {VMX,SVM}-enabled CPU, so would correctly indicate that VMX/SVM
is indeed supported by CPU, but code to drive it can't be used.
New routines using_{vmx,svm}() indicate that both CPU _and_ build provide
corresponding technology support, while cpu_has_{vmx,svm} still remains for
informational runtime purpose, just as their naming suggests.
These new helpers are used right away in several sites, namely guard calls to
start_nested_{svm,vmx} and start_{svm,vmx} to fix a build when INTEL_VMX=n or
AMD_SVM=n.
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Add new option to make altp2m code inclusion optional.
Currently altp2m implemented for Intel EPT only, so option is dependant on VMX.
Also the prompt itself depends on EXPERT=y, so that option is available
for fine-tuning, if one want to play around with it.
Use this option instead of more generic CONFIG_HVM option.
That implies the possibility to build hvm code without altp2m support,
hence we need to declare altp2m routines for hvm code to compile successfully
(altp2m_vcpu_initialise(), altp2m_vcpu_destroy(), altp2m_vcpu_enable_ve())
Also guard altp2m routines, so that they can be disabled completely in the
build -- when target platform does not actually support altp2m
(AMD-V & ARM as of now).
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Explicitly check whether altp2m is on for domain when getting altp2m index.
If explicit call to altp2m_active() always returns false, DCE will remove
call to altp2m_vcpu_idx().
p2m_get_mem_access() expects 0 as altp2m_idx parameter when altp2m not active
or not supported, so 0 is a fallback value then.
The purpose of that is later to be able to disable altp2m support and
exclude its code from the build completely, when not supported by target
platform (as of now it's supported for VT-x only).
Also all other calls to altp2m_vcpu_idx() are guarded by altp2m_active(), so
this change puts usage of this routine in line with the rest of code.
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Acked-by: Tamas K Lengyel <tamas@tklengyel.com>
Introduce two new Kconfig options, AMD_SVM and INTEL_VMX, to allow code
specific to each virtualization technology to be separated and, when not
required, stripped.
CONFIG_AMD_SVM will be used to enable virtual machine extensions on platforms
that implement the AMD Virtualization Technology (AMD-V).
CONFIG_INTEL_VMX will be used to enable virtual machine extensions on platforms
that implement the Intel Virtualization Technology (Intel VT-x).
Both features depend on HVM support.
Since, at this point, disabling any of them would cause Xen to not compile,
the options are enabled by default if HVM and are not selectable by the user.
No functional change intended.
Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Note that trap_init() isn't declared with the __init attribute to
avoid removing __init when multi-CPU support for Xen is added.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
As common code is available it is better to use printk() instead
of early_printk().
Also the printing of "Hello from RISC-V world" is dropped as
it is useless and "All set up is enough".
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Build AMD Architectural P-state driver when CONFIG_AMD is on, and
Intel Hardware P-States driver together with ACPI Processor P-States driver
when CONFIG_INTEL is on respectively, allowing for a platform-specific build.
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Separate ACPI driver from generic initialization cpufreq code.
This way acpi-cpufreq can become optional in the future and be disabled
from non-Intel builds.
no changes to code were introduced, except:
acpi_cpufreq_register() helper added
clean up a list of included headers
license transformed into an SPDX line
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Making the union non-anonymous would cause a lot of headaches, because a lot of
code relies on it being so, but it's possible to make a typedef of the anonymous
union so all callsites currently relying on typeof() can stop doing so directly.
This commit creates a `fpusse_t` typedef to the anonymous union at the head of
the XSAVE area and uses it instead of typeof().
No functional change.
Signed-off-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Transactional Synchronization Extensions are supported on certain Intel's
CPUs only, hence can be put under CONFIG_INTEL build option.
The whole TSX support, even if supported by CPU, may need to be disabled via
options, by microcode or through spec-ctrl, depending on a set of specific
conditions. To make sure nothing gets accidentally runtime-broken all
modifications of global TSX configuration variables is secured by #ifdef's,
while variables themselves redefined to 0, so that ones can't mistakenly be
written to.
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
A last minute review request was to dedup the expression calculating the
domain hash bucket.
While the code reads correctly, it is buggy because rcu_assign_pointer() is a
deeply misleading API assigning by name not value, and - contrary to it's name
- does not hide an indirection.
Therefore, rcu_assign_pointer(bucket, d); updates the local bucket variable on
the stack, not domain_hash[], causing all subsequent domid lookups to fail.
Rework the logic to use pd in the same way that domlist_remove() does.
Fixes: 19995bc70c ("xen/domain: Factor domlist_{insert,remove}() out of domain_{create,destroy}()")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Address compilation error on bullseye-riscv64 container:
undefined reference to `guest_physmap_remove_page`
Since there is no current implementation of `guest_physmap_remove_page()`,
a stub function has been added.
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
These are opencoded linked list and hashtable manipulations. Factor them out
into static inline helpers, and discuss the consequence for the domain.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
This addresses violations of MISRA C:2012 Rule 5.3 which states as
following: An identifier declared in an inner scope shall not hide an
identifier declared in an outer scope. Right here the conflict is with
the global named "e820".
No functional change.
Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@bugseng.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
In case cpu_schedule_up() is failing, it needs to undo all externally
visible changes it has done before.
Reason is that cpu_schedule_callback() won't be called with the
CPU_UP_CANCELED notifier in case cpu_schedule_up() did fail.
Fixes: 207589dbac ("xen/sched: move per cpu scheduler private data into struct sched_resource")
Reported-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
As a defensive measure, make sure to signal an error to the caller
if an unreachable program point is reached.
Signed-off-by: Federico Serafini <federico.serafini@bugseng.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
MISRA C Rule 16.3 states that "An unconditional `break' statement shall
terminate every switch-clause".
Add pseudo keyword fallthrough or missing break statement
to address violations of the rule.
Signed-off-by: Federico Serafini <federico.serafini@bugseng.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
constant_test_bit() is functionally the same as generic_test_bit(),
so constant_test_bit() can be dropped and replaced with
generic_test_bit().
Requested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Taken from Linux-6.4.0-rc1
Xen's bitops.h consists of several Linux's headers:
* linux/arch/include/asm/bitops.h:
* The following function were removed as they aren't used in Xen:
* test_and_set_bit_lock
* clear_bit_unlock
* __clear_bit_unlock
* The following functions were renamed in the way how they are
used by common code:
* __test_and_set_bit
* __test_and_clear_bit
* The declaration and implementation of the following functios
were updated to make Xen build happy:
* clear_bit
* set_bit
* __test_and_clear_bit
* __test_and_set_bit
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
The following generic functions were introduced:
* test_bit
* generic__test_and_set_bit
* generic__test_and_clear_bit
* generic__test_and_change_bit
These functions and macros can be useful for architectures
that don't have corresponding arch-specific instructions.
Also, the patch introduces the following generics which are
used by the functions mentioned above:
* BITOP_BITS_PER_WORD
* BITOP_MASK
* BITOP_WORD
* BITOP_TYPE
The following approach was chosen for generic*() and arch*() bit
operation functions:
If the bit operation function that is going to be generic starts
with the prefix "__", then the corresponding generic/arch function
will also contain the "__" prefix. For example:
* test_bit() will be defined using arch_test_bit() and
generic_test_bit().
* __test_and_set_bit() will be defined using
arch__test_and_set_bit() and generic__test_and_set_bit().
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
The current code in ALT_CALL_ARG() won't successfully workaround the clang
code-generation issue if the arg parameter has a size that's not a power of 2.
While there are no such sized parameters at the moment, improve the workaround
to also be effective when such sizes are used.
Instead of using a union with a long use an unsigned long that's first
initialized to 0 and afterwards set to the argument value.
Reported-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
Suggested-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
One of the error paths in the PV dom0 builder section that runs on the guest
page-tables wasn't restoring the Xen value of %cr3, neither removing the
mapcache override.
Fixes: 079ff2d32c ('libelf-loader: introduce elf_load_image')
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Therefore with SHADOW_PAGING=n this is better compiled out, to avoid
leaving around unreachable/dead code.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
No other arch-*.h does so, and arch-x86/xen.h really just takes the role
of arch-x86_32.h and arch-x86_64.h (by those two forwarding there). With
xen.h itself including the per-arch headers, doing so is also kind of
backwards anyway, and just calling for problems. There's exactly one
place where arch-x86/xen.h is included when really xen.h is meant (for
wanting XEN_GUEST_HANDLE_64() to be made available, the default
definition of which lives in the common xen.h).
This then addresses a violation of Misra C:2012 Directive 4.10
("Precautions shall be taken in order to prevent the contents of a
header file being included more than once").
Reported-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
There's no use of them anymore except in the definitions of the non-
underscore-prefixed aliases.
On Arm convert the (renamed) inline function to a macro.
On x86 rename the inline functions, adjust the virt_to_maddr() #define,
and purge the maddr_to_virt() one, thus eliminating a bogus cast which
would have allowed the passing of a pointer type variable into
maddr_to_virt() to go silently.
No functional change intended.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Julien Grall <jgrall@amazon.com>
With arch_domain_create() no longer being called with the idle domain, drop
the last remaining logic.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
With x86 implementing arch_init_idle_domain(), there is no longer any need to
call arch_domain_create() with the idle domain.
Have the idle domain exit early with all other system domains. Move the
static-analysis ASSERT() earlier. Then, remove the !is_idle_domain()
protections around the majority of domain_create() and remove one level of
indentation.
No practical change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
The idle domain needs d->arch.ctxt_switch initialised on x86. Implement the
new arch_init_idle_domain() in order to do this.
Intentionally remove cpu_policy's initialisation to ZERO_BLOCK_PTR. It has
never tripped since it's introduction, and is weird to have in isolation
without a similar approach on other pointers.
No practical change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
The idle domain causes a large amount of complexity in domain_create() because
of x86's need to initialise d->arch.ctxt_switch in arch_domain_create().
In order to address this, introduce an optional hook to perform extra
initialisation of the idle domain.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Add a test script and related job for running x86_64 dom0 tests.
Signed-off-by: Victor Lira <victorm.lira@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
In practice, we are already following R18.6 and we have zero violations
reported by ECLAIR (there are some cautions being reported.)
Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>
Acked-by: Bertrand Marquis <bertrand.marquis@arm.com>
As discussed during the last MISRA C meeting, add Rule 12.2 to the list
of MISRA C rules we accept, together with an explanation that we use gcc
-fsanitize=undefined to check for violations.
Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
This patch adds a bunch of rules to rules.rst that are uncontroversial
and have zero violations in Xen. As such, they have been approved for
adoption.
All the ones that regard the standard library have the link to the
existing footnote in the notes.
Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
In the file include/xen/event.h macro set_bit is called with argument
current->pause_flags.
Once expanded this set_bit's argument is used in sizeof operations
and thus 'current', being a macro that expands to a function
call with potential side effects, generates a violation.
To address this violation the value of current is therefore stored in a
variable called 'v' before passing it to macro set_bit.
No functional change.
Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@bugseng.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
To change the cd-rom medium, libxl will:
- QMP eject the medium from QEMU
- block-detach the old PV disk
- block-attach the new PV disk
- QMP change the medium to the new PV disk by fdset-id
The QMP code is reused, and remove and attach are implemented here.
The stubdom must internally handle adding /dev/xvdc to the appropriate
fdset. libxl in dom0 doesn't see the result of adding to the fdset as
that is internal to the stubdom, but the fdset's opaque fields will be
set to stub-devid:$devid, so libxl can identify it. $devid is common
between the stubdom and libxl, so it can be identified on both side.
The stubdom will name the device xvdY regardless of the guest name hdY,
sdY, or xvdY, but the stubdom will be assigned the same devid
facilitating lookup. Because the stubdom add-fd call is asynchronous,
libxl needs to poll query-fdsets to identify when add-fd has completed.
For cd-eject, we still need to attach the empty vbd. This is necessary
since xenstore is used to determine that hdc exists. Otherwise after
eject, hdc would be gone and the cd-insert would fail to find the drive
to insert new media.
Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Signed-off-by: Jason Andryuk <jason.andryuk@amd.com>
Reviewed-by: Anthony PERARD <anthony.perard@vates.tech>
Upgrade Yocto to a newer version. Use ext4 as image format for testing
with QEMU on ARM and ARM64 as the default is WIC and it is not available
for our xen-image-minimal target.
Also update the tar.bz2 filename for the rootfs.
Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>
Reviewed-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
George Dunlap
Sergiy Kibrik
Xenia Ragiadakou
Oleksii Kurochko
Alejandro Vallejo
Petr Beneš
Andrew Cooper
Maria Celeste Cesario
Alessandro Zucchelli
Juergen Gross
Federico Serafini
Fouad Hilly
Roger Pau Monné
Jan Beulich
Victor Lira
Stefano Stabellini
Stefano Stabellini
Jason Andryuk