The Big QEMU Lock (BQL) has many names and they are confusing. The
actual QemuMutex variable is called qemu_global_mutex but it's commonly
referred to as the BQL in discussions and some code comments. The
locking APIs, however, are called qemu_mutex_lock_iothread() and
qemu_mutex_unlock_iothread().
The "iothread" name is historic and comes from when the main thread was
split into into KVM vcpu threads and the "iothread" (now called the main
loop thread). I have contributed to the confusion myself by introducing
a separate --object iothread, a separate concept unrelated to the BQL.
The "iothread" name is no longer appropriate for the BQL. Rename the
locking APIs to:
- void bql_lock(void)
- void bql_unlock(void)
- bool bql_locked(void)
There are more APIs with "iothread" in their names. Subsequent patches
will rename them. There are also comments and documentation that will be
updated in later patches.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Acked-by: Fabiano Rosas <farosas@suse.de>
Acked-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Peter Xu <peterx@redhat.com>
Acked-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Acked-by: Hyman Huang <yong.huang@smartx.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-id: 20240102153529.486531-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
No changes in the output from the following command.
[gshan@gshan q]$ ./build/qemu-system-hppa -cpu ?
Available CPUs:
hppa
hppa64
Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20231114235628.534334-13-gshan@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
For all targets, the CPU class returned from CPUClass::class_by_name()
and object_class_dynamic_cast(oc, CPU_RESOLVING_TYPE) need to be
compatible. Lets apply the check in cpu_class_by_name() for once,
instead of having the check in CPUClass::class_by_name() for individual
target.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Gavin Shan <gshan@redhat.com>
Message-ID: <20231114235628.534334-4-gshan@redhat.com>
Since commit 3a9d0d7b64 ("hw/cpu: Call object_class_is_abstract()
once in cpu_class_by_name()"), there is no need to check if @oc is
abstract because it has been covered by cpu_class_by_name().
Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231114235628.534334-3-gshan@redhat.com>
[PMD: Mention commit 3a9d0d7b64]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Two patches for 8.2.
The SHRPD patch fixes a real translation bug which then allows to boot
the 64-bit Linux kernels of the Debian-11 and Debian-12 installation CDs.
The second patch adds the instruction byte sequence to the
assembly log. This is not an actual bug fix, but it's important since
it helps a lot when trying to fix qemu translation bugs on hppa.
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Merge tag 'hppa64-fixes-pull-request' of https://github.com/hdeller/qemu-hppa into staging
HPPA64-PATCHES-for-8.2
Two patches for 8.2.
The SHRPD patch fixes a real translation bug which then allows to boot
the 64-bit Linux kernels of the Debian-11 and Debian-12 installation CDs.
The second patch adds the instruction byte sequence to the
assembly log. This is not an actual bug fix, but it's important since
it helps a lot when trying to fix qemu translation bugs on hppa.
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# gpg: Signature made Fri 17 Nov 2023 15:04:15 EST
# gpg: using EDDSA key BCE9123E1AD29F07C049BBDEF712B510A23A0F5F
# gpg: Good signature from "Helge Deller <deller@gmx.de>" [unknown]
# gpg: aka "Helge Deller <deller@kernel.org>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 4544 8228 2CD9 10DB EF3D 25F8 3E5F 3D04 A7A2 4603
# Subkey fingerprint: BCE9 123E 1AD2 9F07 C049 BBDE F712 B510 A23A 0F5F
* tag 'hppa64-fixes-pull-request' of https://github.com/hdeller/qemu-hppa:
disas/hppa: Show hexcode of instruction along with disassembly
target/hppa: Fix 64-bit SHRPD instruction
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
When shifting the two joined 64-bit registers right, shift the upper
64-bit register to the left and the lower 64-bit register to the right
before merging them with OR.
Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Fixes: bb67ec32a0 "target/hppa: Include PSW_P in tb flags and mmu index"
Fixes: d7553f3591 "target/hppa: Populate an interval tree with valid tlb entries"
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This is the value that is supported by both PA-8500 and Astro.
If we support a larger address space than expected, we trip up
software that did not fill in all of the page table bits,
expecting them to be ignored.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Align the language with pa2.0, separating absolute and physical.
The translation from absolute to physical depends on PSW.W, and
we prefer not to flush between changes, therefore use 2 mmu_idx.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reduce the number of direct checks against MMU_PHYS_IDX.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Coverty found that the shift of TARGET_PAGE_SIZE (32-bit type) might
overflow. Fix it by casting TARGET_PAGE_SIZE to a 64-bit type before
doing the shift (CID 1523902 and CID 1523908).
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <ZU6F/H8CZr3q4pP/@p100>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Need to use iasq_b and iaoq_b to determine back register of CR_IIASQ.
This fixes random faults when booting up Linux user space.
Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Direct privilege level to mmu_idx mapping has been
false for some time. Provide the correct value to
hppa_get_physical_address.
Fixes: fa824d99f9 ("target/hppa: Switch to use MMU indices 11-15")
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
During the conversion to decodetree, the 2-bit mask was lost.
Fixes: deee69a19f ("target/hppa: Convert memory management insns")
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The system mask is a restricted subset of the psw, with only
a couple of reserved bits. It is better to handle this up
front in the translator than require helper_swap_system_mask
to use cpu_hppa_get_psw and cpu_hppa_put_psw.
Signed-off-by: Helge Deller <deller@gmx.de>
[rth: Handle this in expand_sm_imm not helper_swap_system_mask.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The OBJECT_DECLARE_CPU_TYPE() macro forward-declares each
ArchCPUClass type. These forward declarations are sufficient
for code in hw/ to use the QOM definitions. No need to expose
these structure definitions. Keep each local to their target/
by moving them to the corresponding "cpu.h" header.
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231013140116.255-13-philmd@linaro.org>
"target/foo/cpu-qom.h" is supposed to be target agnostic
(include-able by any target). Add such mention in the
header.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231013140116.255-3-philmd@linaro.org>
Enforce the style described by commit 067109a11c ("docs/devel:
mention the spacing requirement for QOM"):
The first declaration of a storage or class structure should
always be the parent and leave a visual space between that
declaration and the new code. It is also useful to separate
backing for properties (options driven by the user) and internal
state to make navigation easier.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Message-Id: <20231013140116.255-2-philmd@linaro.org>
Fill in the insn_start value during form_gva, and copy
it out to the env field in hppa_restore_state_to_opc.
The value is not yet consumed.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The previous decoding misnamed the bit it called "local".
Other than the name, the implementation was correct for pa1.x.
Rename this field to "tlbe".
PA2.0 adds (a real) local bit to PxTLB, and also adds a range
of pages to flush in GR[b].
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
These are aliased onto the normal integer loads to %g0.
Since we don't emulate caches, prefetch is a nop.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reduce the number of times we look for the constant 0.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The default PSW is set by the operating system with the PDC_PSW
firmware call. Use that setting to decide if wide mode is to be
enabled for interruptions and EIRR usage.
Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Split out the tlb to a subsection so that it can be separately
versioned -- the format is only partially following the architecture
and is partially guided by the qemu implementation.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The conversions to/from i64 can be eliminated entirely,
folding computation into adjacent operations.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Rename the existing insert tlb helpers to emphasize that they
are for pa1.1 cpus. Implement a combined i/d tlb for pa2.0.
Still missing is the new 'P' tlb bit.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
