ppc only migrates reserve_addr, so the destination machine can get a
valid reservation with an incorrect reservation value of 0. Prior to
commit 392d328abe ("target/ppc: Ensure stcx size matches larx"),
this could permit a stcx. to incorrectly succeed. That commit
inadvertently fixed that bug because the target machine starts with an
impossible reservation size of 0, so any stcx. will fail.
This behaviour is permitted by the ISA because reservation loss may
have implementation-dependent cause. What's more, with KVM machines it
is impossible save or reasonably restore reservation state. However if
the vmstate is being used for record-replay, the reservation must be
saved and restored exactly in order for execution from snapshot to
match the record.
This patch deprecates the existing incomplete reserve_addr vmstate,
and adds a new vmstate subsection with complete reservation state.
The new vmstate is needed only when record-replay mode is active.
Acked-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reading the time more than once to perform an operation always increases
complexity and fragility due to introduced deltas. Simplify the
decrementer write by reading the clock once for the operation.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Lower interrupts, delete timers, and set time facility registers
back to initial state on machine reset.
This is not so important for record-replay since timebase and
decrementer are migrated, but it gives a cleaner reset state.
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Cc: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[ clg: checkpatch.pl fixes ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
TCG does not maintain the DEC reigster in the SPR array, so it does get
migrated. TCG also needs to re-start the decrementer timer on the
destination machine.
Load and store the decrementer into the SPR when migrating. This works
for the level-triggered (book3s) decrementer, and should be compatible
with existing KVM machines that do keep the DEC value there.
This fixes lost decrementer interrupt on migration that can cause
hangs, as well as other problems including record-replay bugs.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
When writing a value to the decrementer that raises an exception, the
irq is raised, but the value is not stored so the store doesn't appear
to have changed the register when it is read again.
Always store the write value to the register.
Fixes: e81a982aa5 ("PPC: Clean up DECR implementation")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
When storing a large decrementer value with the most significant
implemented bit set, it is to be treated as a negative and sign
extended.
This isn't hit for book3s DEC because of another bug, fixing it
in the next patch exposes this one and can cause additional
problems, so fix this first. It can be hit with HDECR and other
edge triggered types.
Fixes: a8dafa5251 ("target/ppc: Implement large decrementer support for TCG")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[ clg: removed extra cpu and pcc variables shadowing local variables ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
The decrementer register contains a relative time in timebase units.
When writing to DECR this is converted and stored as an absolute value
in nanosecond units, reading DECR converts back to relative timebase.
The tb<->ns conversion of the relative part can cause rounding such that
a value writen to the decrementer can read back a different, with time
held constant. This is a particular problem for a deterministic icount
and record-replay trace.
Fix this by storing the absolute value in timebase units rather than
nanoseconds. The math before:
store: decr_next = now_ns + decr * ns_per_sec / tb_per_sec
load: decr = (decr_next - now_ns) * tb_per_sec / ns_per_sec
load(store): decr = decr * ns_per_sec / tb_per_sec * tb_per_sec /
ns_per_sec
After:
store: decr_next = now_ns * tb_per_sec / ns_per_sec + decr
load: decr = decr_next - now_ns * tb_per_sec / ns_per_sec
load(store): decr = decr
Fixes: 9fddaa0c0c ("PowerPC merge: real time TB and decrementer - faster and simpler exception handling (Jocelyn Mayer)")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
The rule of timers is typically that they should never expire before the
timeout, but some time afterward. Rounding timer intervals up when doing
conversion is the right thing to do.
Under most circumstances it is impossible observe the decrementer
interrupt before the dec register has triggered. However with icount
timing, problems can arise. For example setting DEC to 0 can schedule
the timer for now, causing it to fire before any more instructions
have been executed and DEC is still 0.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This will be used for converting time intervals in different base units
to host units, for the purpose of scheduling timers to emulate target
timers. Timers typically must not fire before their requested expiry
time but may fire some time afterward, so rounding up is the right way
to implement these.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
[ clg: renamed __muldiv64() to muldiv64_rounding() ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
These calculations are repeated several times, and they will become
a little more complicated with subsequent changes.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Failing to reset the of_instance_last makes ihandle allocation continue
to increase, which causes record-replay replay fail to match the
recorded trace.
Not resetting claimed_base makes VOF eventually run out of memory after
some resets.
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>
Fixes: fc8c745d50 ("spapr: Implement Open Firmware client interface")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Convention is to reset the exception_index and error_code after handling
an interrupt. The vhyp hcall handler fails to do this. This does not
appear to have ill effects because cpu_handle_exception() clears
exception_index later, but it is fragile and inconsistent. Reset the
exception state after handling vhyp hcall like other handlers.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Wire up the H_SET_MODE debug resources to the CIABR and DAWR0 debug
facilities in TCG.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
ISA v2.07S introduced the watchpoint facility based on the DAWR0
and DAWRX0 SPRs. Implement this in TCG.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
ISA v2.07S introduced the breakpoint facility based on the CIABR SPR.
Implement this in TCG.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
BookS does not take single step interrupts on completion of rfi and
similar (rfid, hrfid, rfscv). This is not a completely clean way to
do it, but in general non-branch instructions that change NIP on
completion are excluded.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Improve the emulation accuracy of the single step and branch trace
interrupts for v2.07S. Set SRR1[33]=1, and set SIAR to completed
instruction address.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Single-step interrupts are suppressed if the nip is between 0x100 and
0xf00. This has been the case for a long time and it's not clear what
the intention is. Likely either an attempt to suppress trace interrupts
for instructions that cause an interrupt on completion, or a workaround
to prevent software tripping over itself single stepping its interrupt
handlers.
BookE interrupt vectors are set by IVOR registers, and BookS has AIL
modes and new interrupt types, so there are many interrupts including
the debug interrupt which can be outside this range. So any effect it
might have had does not cover most cases (including Linux on recent
BookS CPUs).
Remove this special case.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[ clg : fixed typo in commit logs ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Linux sets these to control cache flush behaviour on Power9. Supervisor
and hypervisor are allowed to write, and reads are noops.
Add implementations to avoid noisy messages when booting Linux under the
pseries machine with guest_errors enabled.
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Change radix model to always generate a storage interrupt when the R/C
bits are not set appropriately in a PTE instead of setting the bits
itself. According to the ISA both behaviors are valid, but in practice
this change more closely matches behavior observed on the POWER9 CPU.
From the POWER9 Processor User's Manual, Section 4.10.13.1: "When
performing Radix translation, the POWER9 hardware triggers the
appropriate interrupt ... for the mode and type of access whenever
Reference (R) and Change (C) bits require setting in either the guest or
host page-table entry (PTE)."
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
* Check for availablility of more devices in qtests before using them
* Some other minor qtest fixes
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Merge tag 'pull-request-2023-08-31' of https://gitlab.com/thuth/qemu into staging
* Use precise selfmodifying code mode on s390x TCG
* Check for availablility of more devices in qtests before using them
* Some other minor qtest fixes
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# gpg: Signature made Thu 31 Aug 2023 15:16:14 EDT
# gpg: using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg: issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg: aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg: aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg: aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3 EAB9 2ED9 D774 FE70 2DB5
* tag 'pull-request-2023-08-31' of https://gitlab.com/thuth/qemu:
meson: test for CONFIG_TCG in config_all
subprojects/berkeley-testfloat-3: Update to fix a problem with compiler warnings
tests/qtest/bios-tables-test: Check for virtio-iommu device before using it
tests/qtest/netdev-socket: Avoid variable-length array in inet_get_free_port_multiple()
tests/qtest/usb-hcd-xhci-test: Check availability of devices before using them
tests/tcg/s390x: Test precise self-modifying code handling
target/s390x: Define TARGET_HAS_PRECISE_SMC
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Recent versions of macOS use clang instead of gcc. The OS_OBJECT_USE_OBJC
define is only necessary when building with gcc. Let's not define it when
building with clang.
With this patch, I can successfully include GCD headers in QEMU when
building with clang.
Signed-off-by: Alexander Graf <graf@amazon.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-ID: <20230830161425.91946-2-graf@amazon.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Since commit 139c1837db ("meson: rename included C source files
to .c.inc"), QEMU standard procedure for included C files is to
use *.c.inc.
Besides, since commit 6a0057aa22 ("docs/devel: make a statement
about includes") this is documented as the Coding Style:
If you do use template header files they should be named with
the ``.c.inc`` or ``.h.inc`` suffix to make it clear they are
being included for expansion.
Therefore rename 'bti-crt.inc.c' as 'bti-crt.c.inc'.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230606141252.95032-6-philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-ID: <20230823065335.1919380-2-mjt@tls.msk.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230823065335.1919380-3-mjt@tls.msk.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Francisco Iglesias <frasse.iglesias@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230522153144.30610-2-philmd@linaro.org>
kvmclock_create() is only implemented in hw/i386/kvm/clock.h.
Restrict the "hw/kvm/clock.h" header to i386 by moving it to
hw/i386/.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230620083228.88796-3-philmd@linaro.org>
We shouldn't call kvmclock_create() when KVM is not available
or disabled:
- check for kvm_enabled() before calling it
- assert KVM is enabled once called
Since the call is elided when KVM is not available, we can
remove the stub (it is never compiled).
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230620083228.88796-2-philmd@linaro.org>
In xhci_get_port_bandwidth(), we use a variable-length array to
construct the buffer to send back to the guest. Avoid the VLA
by using dma_memory_set() to directly request the memory system
to fill the guest memory with a string of '80's.
The codebase has very few VLAs, and if we can get rid of them all we
can make the compiler error on new additions. This is a defensive
measure against security bugs where an on-stack dynamic allocation
isn't correctly size-checked (e.g. CVE-2021-3527).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230824164818.2652452-1-peter.maydell@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-ID: <20230823065335.1919380-14-mjt@tls.msk.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-ID: <20230823065335.1919380-18-mjt@tls.msk.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230823065335.1919380-7-mjt@tls.msk.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230823065335.1919380-15-mjt@tls.msk.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-ID: <20230823065335.1919380-14-mjt@tls.msk.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-ID: <20230823065335.1919380-14-mjt@tls.msk.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
QOM object instance should not modify its class state (because
all other objects instanciated from this class get affected).
Instead of modifying the PMBusDeviceClass 'device_num_pages' field
the first time a instance is initialized (in pmbus_pages_alloc),
introduce a new pmbus_pages_num() helper which returns the page
number from the class without modifying the class state.
The code logic become slighly simplified.
Inspired-by: Bernhard Beschow <shentey@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230523064408.57941-4-philmd@linaro.org>
0x400 is Data Register Break Error (DR_BE),
0x10 is Line Control Register Fifo Enabled (LCR_FEN)
and 0x1 is Send Break (LCR_BRK).
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230522153144.30610-7-philmd@linaro.org>
PL011_INT_TX duplicates INT_TX, and PL011_INT_RX INT_RX.
Follow other register fields definitions from this file,
keep the shorter form.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230522153144.30610-6-philmd@linaro.org>
To avoid knowing the register addresses by heart,
display their name along in the trace events.
Since the MMIO region is 4K wide (0x1000 bytes),
displaying the address with 3 digits is enough,
so reduce the address format.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230522153144.30610-5-philmd@linaro.org>
The pl011_read() and pl011_write() handlers shift the offset
argument by 2, so are implemented on a 32-bit boundary.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230710175102.32429-2-philmd@linaro.org>
GLib recommend to use G_SOURCE_REMOVE / G_SOURCE_CONTINUE
for GSourceFunc callbacks. Our FEWatchFunc is a GSourceFunc
returning such value. Use such definitions which are
"more memorable" [*].
[*] https://docs.gtk.org/glib/callback.SourceFunc.html#return-value
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230705133139.54419-5-philmd@linaro.org>
'qemu/atomic.h' and 'exec/target_page.h' are not used.
'qemu/interval-tree.h' is only required for user emulation.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230828221314.18435-12-philmd@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230828221314.18435-11-philmd@linaro.org>
Since commit fa92bd4af7 ("target/xtensa: fix access to
the INTERRUPT SR") these files use QEMU atomic API.
Explicit the header inclusion instead of relying on
implicit and indirect inclusion.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230828221314.18435-10-philmd@linaro.org>
This files only access the address_space_ld/st API, declared
in "exec/cpu-all.h", already included by "cpu.h".
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230828221314.18435-9-philmd@linaro.org>
"qemu/main-loop.h" declares functions related to QEMU's
main loop mutex, which these files don't access. Remove
the unused "qemu/main-loop.h" header.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230828221314.18435-8-philmd@linaro.org>
These files don't use the CPU ld/st API, remove the unnecessary
"exec/cpu_ldst.h" header.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230828221314.18435-7-philmd@linaro.org>
