Page tables allocated in that function should be mapped and unmapped
now.
Note that pl2e now maybe mapped and unmapped in different iterations, so
we need to add clean-ups for that.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Page tables allocated in that function should be mapped and unmapped
now.
Take the opportunity to avoid a potential double map in
map_pages_to_xen() by initialising pl1e to NULL and only map it if it
was not mapped earlier.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Rewrite those functions to use the new APIs. Modify its callers to unmap
the pointer returned. Since alloc_xen_pagetable_new() is almost never
useful unless accompanied by page clearing and a mapping, introduce a
helper alloc_map_clear_xen_pt() for this sequence.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
As of commit 6fa7408d72b3 ("ld: don't generate base relocations in PE
output for absolute symbols") I'm feeling sufficiently confident in GNU
ld to use its logic for generating base relocations, which was enabled
for executables at some point last year (prior to that this would have
got done only for DLLs).
GNU ld, seeing the original relocations coming from the ELF object files,
generates different relocation types for our page tables (64-bit ones,
while mkreloc produces 32-bit ones). This requires also permitting and
handling that type in efi_arch_relocate_image().
Note that in the case that we leave base relocation generation to ld,
while efi/relocs-dummy.o then won't be linked into any executable
anymore, it still needs generating (and hence dependencies need to be
kept as they are) in order to have VIRT_BASE pulled out of it.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Now that its contents matches prelink.o, use that one uniformly.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
There's no need to link relocs-dummy.o into the ELF binary. The two
symbols needed can as well be provided by the linker script. Then our
mkreloc tool also doesn't need to put them in the generated assembler
source.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
While they apparently do no harm when building xen.efi, their use is
potentially misleading. Conditionalize their use to be for just the ELF
binary we produce.
No change to the resulting binaries.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Since we'd like the updates to be done as synchronously as possible,
make an attempt at yielding immediately after the TSC write.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
To reduce latency on time_calibration_tsc_rendezvous()'s last loop
iteration, read the value to be written on the last iteration at the end
of the loop body (i.e. in particular at the end of the second to last
iteration).
On my single-socket 18-core Skylake system this reduces the average loop
exit time on CPU0 (from the TSC write on the last iteration to until
after the main loop) from around 32k cycles to around 29k (albeit the
values measured on separate runs vary quite significantly).
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Add a debian build container with cross-gcc for arm32 installed.
Add build jobs to cross-compile Xen-only for arm32.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Acked-by: Wei Liu <wl@xen.org>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Revert the code that associates the group pointer with the S2CR as this
code causing an issue when the SMMU device has more than one master
device with same stream-id. This issue is introduced by commit
0435784cc7 ("xen/arm: smmuv1: Intelligent SMR allocation”
Reverting the code will not impact to use of SMMU if two devices use the
same stream-id but each device will be in a separate group. This is the same
behaviour before the code is merged.
Fixes: 0435784cc7 ("xen/arm: smmuv1: Intelligent SMR allocation”
Signed-off-by: Rahul Singh <rahul.singh@arm.com>
Some CPUs can speculate past a RET instruction and potentially perform
speculative accesses to memory before processing the return.
There is no known gadget available after the RET instruction today.
However some of the registers (such as in check_pending_guest_serror())
may contain a value provided by the guest.
In order to harden the code, it would be better to add a speculation
barrier after each RET instruction. The performance impact is meant to
be negligeable as the speculation barrier is not meant to be
architecturally executed.
Rather than manually inserting a speculation barrier, use a macro
which overrides the mnemonic RET and replace with RET + SB. We need to
use the opcode for RET to prevent any macro recursion.
This patch is only covering the assembly code. C code would need to be
covered separately using the compiler support.
Note that the definition of the macros sb needs to be moved earlier in
asm-arm/macros.h so it can be used by the new macro.
This is part of the work to mitigate straight-line speculation.
Signed-off-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Current interrupt pass though code will setup a timer for each
interrupt injected to the guest that requires an EOI from the guest.
Such timer would perform two actions if the guest doesn't EOI the
interrupt before a given period of time. The first one is deasserting
the virtual line, the second is perform an EOI of the physical
interrupt source if it requires such.
The deasserting of the guest virtual line is wrong, since it messes
with the interrupt status of the guest. This seems to have been done
in order to compensate for missing deasserts when certain interrupt
controller actions are performed. The original motivation of the
introduction of the timer was to fix issues when a GSI was shared
between different guests. We believe that other changes in the
interrupt handling code (ie: proper propagation of EOI related actions
to dpci) will have fixed such errors now.
Performing an EOI of the physical interrupt source is redundant, since
there's already a timer that takes care of this for all interrupts,
not just the HVM dpci ones, see irq_guest_action_t struct eoi_timer
field.
Since both of the actions performed by the dpci timer are not
required, remove it altogether.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
When pins are cleared from either ISR or IRR as part of the
initialization sequence forward the clearing of those pins to the dpci
EOI handler, as it is equivalent to an EOI. Not doing so can bring the
interrupt controller state out of sync with the dpci handling logic,
that expects a notification when a pin has been EOI'ed.
Fixes: 7b3cb5e541 ('IRQ injection changes for HVM PCI passthru.')
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Wait until the end of the init sequence to trigger the unmask event.
Note that it will be unconditionally triggered, but that's harmless if
not unmask actually happened.
While there change the variable type to bool.
Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
When the PIC is on the init sequence prevent interrupt delivery. The
state of the registers is in the process of being set during the init
phase, so it makes sense to prevent any int line changes during that
process.
Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Like ERMS this can always be exposed to guests, but I guess once we
introduce full validation we want to make sure we don't reject incoming
policies with any of these set when in the raw/host policies they're
clear.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
By excluding the file from being built for !HVM, #ifdef-ary can be
removed from it.
The new HVM dependency on the Kconfig option is benign for Arm.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Tamas K Lengyel <tamas@tklengyel.com>
Reviewed-by: Alexandru Isaila <aisaila@bitdefender.com>
Some of them have entries with stale comments. Rather than correcting
these comments, re-arrange how these arrays get populated: Use dedicated
element initializers, serving the purpose of what the comments did so
far. This then also makes these arrays independent of the actual
ordering of the individual SH_type_*.
While tightening respective ASSERT()s in hash_{vcpu,domain}_foreach(),
also tighten related ones in shadow_hash_{insert,delete}().
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Tim Deegan <tim@xen.org>
This hunk was missing from the work to drop gettext as a build dependency.
Fixes: e21a6a4f96 ("tools: Drop gettext as a build dependency")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
At the moment, we are computing offsets/masks for each level and
granularity. This is a bit of waste given that we only need to
know the offsets/masks for the granularity used by the guest.
All the LPAE information can easily be inferred with just the
page shift for a given granularity and the level.
So rather than providing a set of helpers per granularity, we can
provide a single set that takes the granularity and the level in
parameters.
With the new helpers in place, we can rework guest_walk_ld() to
only compute necessary information.
Signed-off-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Tested-by: Bertrand Marquish <bertrand.marquis@arm.com>
In a follow-up patch we may want to automatically replace some
mnemonics (such as ret) with a different sequence.
To ensure all the assembly files will include asm/macros.h it is best to
automatically include it on single assembly. This can be done via
config.h.
It was necessary to include a few more headers as dependency:
- <asm/asm_defns.h> to define sizeof_*
- <xen/page-size.h> which is already a latent issue given STACK_ORDER
rely on PAGE_SIZE.
Unfortunately the build system will use -D__ASSEMBLY__ when generating
the linker script. A new option -D__LINKER__ is introduceed and used for
the linker script to avoid including headers (such as asm/macros.h) that
may not be compatible with the syntax.
Lastly, take the opportunity to remove both asm/asm-offsets.h and
asm/macros.h from the various assembly files as they are now
automagically included.
Signed-off-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
The type is no longer appropriate for anything other than PV, and therefore
should not retain its generic name.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
dom0_update_physmap() is mostly called in two tight loops, where the lfences
hidden in is_pv_32bit_domain() have a substantial impact.
None of the boot time construction needs protection against malicious
speculation, so use a local variable and calculate is_pv_32bit_domain() just
once.
Reformat the some of the code for legibility, now that the volume has reduced,
and removal of some gratuitous negations.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
These standard functions shouldn't need custom declarations. The only
case where redundancy might be needed is if there were inline functions
there. But we don't have any here (anymore). Prune the per-arch headers
of duplicate declarations while moving the asm/string.h inclusion past
the declarations.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>
These were built for 32-bit architectures only (the same code could,
with some tweaking, sensibly be used to provide TI-mode helpers on
64-bit arch-es) - retain this property, while still avoiding to have
a CU without any contents at all. For this, Arm's CONFIG_64BIT gets
generalized.
Note that we imply "32-bit arch" to be the same as BITS_PER_LONG == 32,
i.e. we aren't (not just here) prepared to have a 64-bit arch with
BITS_PER_LONG == 32. Yet even if we supported such, likely the compiler
would get away there without invoking these helpers, so the code would
remain unused in practice.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>
Make this a separate archive member under lib/. While doing so, don't
move latently broken x86 assembly though: Fix the constraints, such
that properly extending inputs to 64-bit won't just be a side effect of
needing to copy registers, and such that we won't fail to clobber %rdx.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
With xen/common/decompress.h now agreeing in both build modes about
what STATIC expands to, there's no need for these abstractions anymore.
Requested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>
While tools/libs/guest/xg_private.h has its own (non-conflicting for our
purposes) __init, which hence needs to be #undef-ed, there's no other
need for this abstraction.
Requested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>
Commit e1de4c196a ("x86/timer: Fix boot on Intel systems using ITSSPRC
static PIT clock gating") was reported to cause boot failures on certain
AMD Ryzen systems.
Refine the fix to do nothing in the default case, and only attempt to
configure legacy replacement mode if IRQ0 is found to not be working. If
legacy replacement mode doesn't help, undo it before falling back to other IRQ
routing configurations.
In addition, introduce a "hpet" command line option so this heuristic
can be overridden. Since it makes little sense to introduce just
"hpet=legacy-replacement", also allow for a boolean argument as well as
"broadcast" to replace the separate "hpetbroadcast" option.
Reported-by: Frédéric Pierret frederic.pierret@qubes-os.org
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Tested-by: Frédéric Pierret <frederic.pierret@qubes-os.org>
This reverts commit e680cc48b7.
It was committed despite multiple objections. The agreed upon fix is a
different variation of the same original patch, and the delta between the two
is far from clear.
By reverting this commit first, the fixes are clear and coherent as individual
patches, and in the appropriate form for backport to the older trees.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
This patch prevents the dom0 to be loaded skipping its
building and going forward to build domUs when the dom0
kernel is not found and at least one domU is present.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
This patch adds a comment in create_domUs() right before
domain_create() to explain the importance of the pre-increment
operator on the variable max_init_domid, to ensure that the
domid 0 is allocated only during start_xen() function by the
create_dom0() and not on any other possible code path to the
domain_create() function.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Acked-by: Julien Grall <jgrall@amazon.com>
There are a few places on Arm where we use pretty much an open-coded
version of is_hardware_domain(). The main difference, is the helper
will also block speculation (not yet implemented on Arm).
The existing users are not in hot path, so blocking speculation
would not hurt when it is implemented. So remove the open-coded
version within the arm codebase.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
[julieng: Rework the commit message]
Acked-by: Julien Grall <jgrall@amazon.com>
Move dom0 create and start from setup.c to a dedicated
function in domain_build.c.
With this change, the function construct_dom0() is not
used outside of domain_build.c anymore.
So it is now a static function.
No functional changes intended.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Split the logic to attempt to setup LFENCE to be dispatch serializing
on AMD into a helper, so it can be shared with Hygon.
No functional change intended.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
It was probably a mistake to, over time, drop various CONFIG_COMPAT
conditionals from x86-specific code, as we now have a build
configuration again where we'd prefer this to be unset. Arrange for
CONFIG_COMPAT to actually be off in this case, dealing with fallout.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Wei Liu <wl@xen.org>
In such a build various of the compat handlers aren't needed. Don't
reference them from the hypercall table, and compile out those which
aren't needed for HVM. Also compile out switch_compat(), which has no
purpose in such a build.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Wei Liu <wl@xen.org>
Except for the initial part of cstar_enter compat/entry.S is all dead
code in this case. Further, along the lines of the PV conditionals we
already have in entry.S, make code PV32-conditional there too (to a
fair part because this code actually references compat/entry.S).
This has the side effect of moving the tail part (now at compat_syscall)
of the code out of .text.entry (in line with e.g. compat_sysenter).
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Wei Liu <wl@xen.org>
Now that the Alpine Linux build jobs complete successfully on staging we
can remove the "allow_failure: true" tag.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Acked-by: Wei Liu <wl@xen.org>
Clang 11 will throw the following error:
smmu.c:2284:18: error: cast to smaller integer type 'enum arm_smmu_arch_version' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast]
smmu->version = (enum arm_smmu_arch_version)of_id->data;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The error can be prevented by initially casting to (uintptr_t) and then
enum.
Signed-off-by: Julien Grall <jgrall@amazon.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Some callers of flush_page_to_ram() expect the memory to be
invalidated. Reverts commit 9617d5f9c1
to unblock OssTest.
Signed-off-by: Julien Grall <jgrall@amazon.com>
Implementing qrexec+usbip+qemu in Linux-based stub domain leads me to
an issue where a device model stub domain doesn't have maptrack entries.
Signed-off-by: Dmitry Fedorov <d.fedorov@tabit.pro>
Acked-by: Wei Liu <wl@xen.org>
While part of the original AMD64 spec, Long Mode Segment Limit was a feature
not picked up by Intel, and therefore didn't see much adoption in software.
AMD have finally dropped the feature from hardware, and allocated a CPUID bit
to indicate its absence.
Xen has never supported the feature for guests, even when running on capable
hardware, so advertise the feature's absence unilaterally.
There is nothing specifically wrong with exposing this bit to PV guests, but
the PV ABI doesn't include a working concept of MSR_EFER in the first place,
so exposing it to PV guests would be out-of-place.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Put it next to another boolean, so they will "share" the subsequent
padding hole.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Wei Liu