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2023-11-07target/riscv/tcg: add tcg_cpu_finalize_features()Daniel Henrique Barboza
The query-cpu-model-expansion API is capable of passing extra properties to a given CPU model and tell callers if this custom configuration is valid. The RISC-V version of the API is not quite there yet. The reason is the realize() flow in the TCG driver, where most of the validation is done in tcg_cpu_realizefn(). riscv_cpu_finalize_features() is then used to validate satp_mode for both TCG and KVM CPUs. Our ARM friends uses a concept of 'finalize_features()', a step done in the end of realize() where the CPU features are validated. We have a riscv_cpu_finalize_features() helper that, at this moment, is only validating satp_mode. Re-use this existing helper to do all CPU extension validation we required after at the end of realize(). Make it public to allow APIs to use it. At this moment only the TCG driver requires a realize() time validation, thus, to avoid adding accelerator specific helpers in the API, riscv_cpu_finalize_features() uses riscv_tcg_cpu_finalize_features() if we are running TCG. The API will then use riscv_cpu_finalize_features() regardless of the current accelerator. Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20231018195638.211151-4-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07qapi,risc-v: add query-cpu-model-expansionDaniel Henrique Barboza
This API is used to inspect the characteristics of a given CPU model. It also allows users to validate a CPU model with a certain configuration, e.g. if "-cpu X,a=true,b=false" is a valid setup for a given QEMU binary. We'll start implementing the first part. The second requires more changes in RISC-V CPU boot flow. The implementation is inspired by the existing ARM query-cpu-model-expansion impl in target/arm/arm-qmp-cmds.c. We'll create a RISCVCPU object with the required model, fetch its existing properties, add a couple of relevant boolean options (pmp and mmu) and display it to users. Here's an usage example: ./build/qemu-system-riscv64 -S -M virt -display none \ -qmp tcp:localhost:1234,server,wait=off ./scripts/qmp/qmp-shell localhost:1234 Welcome to the QMP low-level shell! Connected to QEMU 8.1.50 (QEMU) query-cpu-model-expansion type=full model={"name":"rv64"} {"return": {"model": {"name": "rv64", "props": {"zicond": false, "x-zvfh": false, "mmu": true, "x-zvfbfwma": false, "x-zvfbfmin": false, "xtheadbs": false, "xtheadbb": false, "xtheadba": false, "xtheadmemidx": false, "smstateen": false, "zfinx": false, "Zve64f": false, "Zve32f": false, "x-zvfhmin": false, "xventanacondops": false, "xtheadcondmov": false, "svpbmt": false, "zbs": true, "zbc": true, "zbb": true, "zba": true, "zicboz": true, "xtheadmac": false, "Zfh": false, "Zfa": true, "zbkx": false, "zbkc": false, "zbkb": false, "Zve64d": false, "x-zfbfmin": false, "zk": false, "x-epmp": false, "xtheadmempair": false, "zkt": false, "zks": false, "zkr": false, "zkn": false, "Zfhmin": false, "zksh": false, "zknh": false, "zkne": false, "zknd": false, "zhinx": false, "Zicsr": true, "sscofpmf": false, "Zihintntl": true, "sstc": true, "xtheadcmo": false, "x-zvbb": false, "zksed": false, "x-zvkned": false, "xtheadsync": false, "x-zvkg": false, "zhinxmin": false, "svadu": true, "xtheadfmv": false, "x-zvksed": false, "svnapot": false, "pmp": true, "x-zvknhb": false, "x-zvknha": false, "xtheadfmemidx": false, "x-zvksh": false, "zdinx": false, "zicbom": true, "Zihintpause": true, "svinval": false, "zcf": false, "zce": false, "zcd": false, "zcb": false, "zca": false, "x-ssaia": false, "x-smaia": false, "zmmul": false, "x-zvbc": false, "Zifencei": true, "zcmt": false, "zcmp": false, "Zawrs": true}}}} Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20231018195638.211151-3-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv/kvm/kvm-cpu.c: add missing property getters()Daniel Henrique Barboza
We got along without property getters in the KVM driver because we never needed them. But the incoming query-cpu-model-expansion API will use property getters and setters to retrieve the CPU characteristics. Add the missing getters for the KVM driver for both MISA and multi-letter extension properties. We're also adding an special getter for absent multi-letter properties that KVM doesn't implement that always return false. Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20231018195638.211151-2-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07docs/system/riscv: update 'virt' machine core limitDaniel Henrique Barboza
The 'virt' RISC-V machine does not have a 8 core limit. The current limit is set in include/hw/riscv/virt.h, VIRT_CPUS_MAX, set to 512 at this moment. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1945 Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Message-ID: <20231020200247.334403-2-dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07linux-user/riscv: change default cpu to 'max'Daniel Henrique Barboza
Commit f57d5f8004 deprecated the 'any' CPU type but failed to change the default CPU for linux-user. The result is that all linux-users invocations that doesn't specify a different CPU started to show a deprecation warning: $ ./build/qemu-riscv64 ./foo-novect.out qemu-riscv64: warning: The 'any' CPU is deprecated and will be removed in the future. Change the default CPU for RISC-V linux-user from 'any' to 'max'. Reported-by: Richard Henderson <richard.henderson@linaro.org> Fixes: f57d5f8004 ("target/riscv: deprecate the 'any' CPU type") Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20231020074501.283063-1-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: Add HS-mode virtual interrupt and IRQ filtering support.Rajnesh Kanwal
This change adds support for inserting virtual interrupts from HS-mode into VS-mode using hvien and hvip csrs. This also allows for IRQ filtering from HS-mode. Also, the spec doesn't mandate the interrupt to be actually supported in hardware. Which allows HS-mode to assert virtual interrupts to VS-mode that have no connection to any real interrupt events. This is defined as part of the AIA specification [0], "6.3.2 Virtual interrupts for VS level". [0]: https://github.com/riscv/riscv-aia/releases/download/1.0/riscv-interrupts-1.0.pdf Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com> Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Message-ID: <20231016111736.28721-7-rkanwal@rivosinc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: Add M-mode virtual interrupt and IRQ filtering support.Rajnesh Kanwal
This change adds support for inserting virtual interrupts from M-mode into S-mode using mvien and mvip csrs. IRQ filtering is a use case of this change, i-e M-mode can stop delegating an interrupt to S-mode and instead enable it in MIE and receive those interrupts in M-mode and then selectively inject the interrupt using mvien and mvip. Also, the spec doesn't mandate the interrupt to be actually supported in hardware. Which allows M-mode to assert virtual interrupts to S-mode that have no connection to any real interrupt events. This is defined as part of the AIA specification [0], "5.3 Interrupt filtering and virtual interrupts for supervisor level". [0]: https://github.com/riscv/riscv-aia/releases/download/1.0/riscv-interrupts-1.0.pdf Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com> Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Message-ID: <20231016111736.28721-6-rkanwal@rivosinc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: Split interrupt logic from riscv_cpu_update_mip.Rajnesh Kanwal
This is to allow virtual interrupts to be inserted into S and VS modes. Given virtual interrupts will be maintained in separate mvip and hvip CSRs, riscv_cpu_update_mip will no longer be in the path and interrupts need to be triggered for these cases from rmw_hvip64 and rmw_mvip64 functions. Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20231016111736.28721-5-rkanwal@rivosinc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: Set VS* bits to one in mideleg when H-Ext is enabledRajnesh Kanwal
With H-Ext supported, VS bits are all hardwired to one in MIDELEG denoting always delegated interrupts. This is being done in rmw_mideleg but given mideleg is used in other places when routing interrupts this change initializes it in riscv_cpu_realize to be on the safe side. Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20231016111736.28721-4-rkanwal@rivosinc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: Check for async flag in case of RISCV_EXCP_SEMIHOST.Rajnesh Kanwal
RISCV_EXCP_SEMIHOST is set to 0x10, which can be a local interrupt id as well. This change moves RISCV_EXCP_SEMIHOST to switch case so that async flag check is performed before invoking semihosting logic. Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20231016111736.28721-3-rkanwal@rivosinc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: Without H-mode mask all HS mode inturrupts in mie.Rajnesh Kanwal
Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20231016111736.28721-2-rkanwal@rivosinc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: rename ext_icboz to ext_zicbozDaniel Henrique Barboza
Add a leading 'z' to improve grepping. When one wants to search for uses of zicboz they're more likely to do 'grep -i zicboz' than 'grep -i icboz'. Suggested-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Message-ID: <20231012164604.398496-5-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: rename ext_icbom to ext_zicbomDaniel Henrique Barboza
Add a leading 'z' to improve grepping. When one wants to search for uses of zicbom they're more likely to do 'grep -i zicbom' than 'grep -i icbom'. Suggested-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Message-ID: <20231012164604.398496-4-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: rename ext_icsr to ext_zicsrDaniel Henrique Barboza
Add a leading 'z' to improve grepping. When one wants to search for uses of zicsr they're more likely to do 'grep -i zicsr' than 'grep -i icsr'. Suggested-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Message-ID: <20231012164604.398496-3-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-07target/riscv: rename ext_ifencei to ext_zifenceiDaniel Henrique Barboza
Add a leading 'z' to improve grepping. When one wants to search for uses of zifencei they're more likely to do 'grep -i zifencei' than 'grep -i ifencei'. Suggested-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Message-ID: <20231012164604.398496-2-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2023-11-06tcg/sparc64: Implement tcg_out_extrl_i64_i32Richard Henderson
Build fix for missing symbol. Cc: qemu-stable@nongnu.org Fixes: dad2f2f5af ("tcg/sparc64: Disable TCG_TARGET_HAS_extr_i64_i32") Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-11-06tcg/optimize: Canonicalize sub2 with constants to add2Richard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-Id: <20231026013945.1152174-4-richard.henderson@linaro.org>
2023-11-06tcg/optimize: Canonicalize subi to addi during optimizationRichard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-Id: <20231026013945.1152174-3-richard.henderson@linaro.org>
2023-11-06tcg: Canonicalize subi to addi during opcode generationRichard Henderson
Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-Id: <20231026013945.1152174-2-richard.henderson@linaro.org>
2023-11-06tcg/optimize: Split out arg_new_constantRichard Henderson
Fixes a bug wherein raw uses of tcg_constant_internal do not have their TempOptInfo initialized. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-11-06tcg: Eliminate duplicate env store operationsRichard Henderson
Notice when a constant is stored to the same location twice. Reviewed-by: Song Gao <gaosong@loongson.cn> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-11-06tcg/optimize: Optimize env memory operationsRichard Henderson
Propagate stores to loads, loads to loads. Reviewed-by: Song Gao <gaosong@loongson.cn> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-11-06tcg/optimize: Split out cmp_better_copyRichard Henderson
Compare two temps for "better", split out from finding the best from a whole list. Use TCGKind, which already gives the proper priority. Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-11-06tcg/optimize: Pipe OptContext into reset_tsRichard Henderson
Will be needed in the next patch. Reviewed-by: Song Gao <gaosong@loongson.cn> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-11-06tcg: Don't free vector resultsRichard Henderson
Avoid reusing vector temporaries so that we may re-use them when propagating stores to loads. Reviewed-by: Song Gao <gaosong@loongson.cn> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-11-06tcg: Remove TCG_TARGET_HAS_neg_{i32,i64}Richard Henderson
The movcond opcode is now mandatory for backends to implement. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231026041404.1229328-7-richard.henderson@linaro.org>
2023-11-06tcg/loongarch64: Implement neg opcodesRichard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231026041404.1229328-6-richard.henderson@linaro.org>
2023-11-06tcg/mips: Implement neg opcodesRichard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231026041404.1229328-5-richard.henderson@linaro.org>
2023-11-06tcg: Remove TCG_TARGET_HAS_movcond_{i32,i64}Richard Henderson
The movcond opcode is now mandatory for backends to implement. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231026041404.1229328-4-richard.henderson@linaro.org>
2023-11-06tcg/mips: Always implement movcondRichard Henderson
Expand as branch over move if not supported in the ISA. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231026041404.1229328-3-richard.henderson@linaro.org>
2023-11-06tcg/mips: Split out tcg_out_setcond_intRichard Henderson
Return the temp and a set of flags, to be used as a primitive for setcond, brcond, movcond. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231026041404.1229328-2-richard.henderson@linaro.org>
2023-11-06tcg: Move tcg_temp_free_* out of lineRichard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-12-richard.henderson@linaro.org>
2023-11-06tcg: Move tcg_temp_new_*, tcg_global_mem_new_* out of lineRichard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-11-richard.henderson@linaro.org>
2023-11-06tcg: Move tcg_constant_* out of lineRichard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-10-richard.henderson@linaro.org>
2023-11-06tcg: Unexport tcg_gen_op*_{i32,i64}Richard Henderson
These functions are no longer used outside tcg-op.c. There are several that are completely unused, so remove them. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-9-richard.henderson@linaro.org>
2023-11-06tcg: Move tcg_gen_opN declarations to tcg-internal.hRichard Henderson
These are used within tcg-op.c and tcg-op-ldst.c. There are no uses outside tcg/. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-8-richard.henderson@linaro.org>
2023-11-06tcg: Move vec_gen_* declarations to tcg-internal.hRichard Henderson
These are used within tcg-op-vec.c and tcg/host/tcg-target.c.inc. There are no uses outside tcg/. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-7-richard.henderson@linaro.org>
2023-11-06tcg: Move 64-bit expanders out of lineRichard Henderson
This one is more complicated, combining 32-bit and 64-bit expansion with C if instead of preprocessor #if. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-6-richard.henderson@linaro.org>
2023-11-06tcg: Move 32-bit expanders out of lineRichard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-5-richard.henderson@linaro.org>
2023-11-06tcg: Move generic expanders out of lineRichard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-4-richard.henderson@linaro.org>
2023-11-06tcg: Move tcg_gen_op* out of lineRichard Henderson
In addition to moving out of line, with CONFIG_DEBUG_TCG mark them all noinline. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-3-richard.henderson@linaro.org>
2023-11-06tcg: Mark tcg_gen_op* as noinlineRichard Henderson
Encourage the compiler to tail-call rather than inline across the dozens of opcode expanders. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20231029210848.78234-2-richard.henderson@linaro.org>
2023-11-06accel/tcg: Fix condition for store_atom_insert_al16Richard Henderson
Store bytes under a mask is fundamentally a cmpxchg, not a straight store. Use HAVE_CMPXCHG128 instead of HAVE_ATOMIC128_RW. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230916220151.526140-8-richard.henderson@linaro.org>
2023-11-06accel/tcg: Remove redundant case in store_atom_16Richard Henderson
We handled the HAVE_ATOMIC128_RW case with atomic16_set at the top of the function; the only thing left for a host without that support is to fall through to cpu_loop_exit_atomic. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230916220151.526140-7-richard.henderson@linaro.org>
2023-11-06host/include/loongarch64: Add atomic16 load and storeRichard Henderson
While loongarch64 does not have a 128-bit cmpxchg, it does have 128-bit atomic load and store via the vector unit. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230916220151.526140-6-richard.henderson@linaro.org>
2023-11-06tcg/loongarch64: Use cpuinfo.hRichard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Jiajie Chen <c@jia.je> Message-Id: <20230916220151.526140-5-richard.henderson@linaro.org>
2023-11-06util: Add cpuinfo for loongarch64Richard Henderson
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Jiajie Chen <c@jia.je> Message-Id: <20230916220151.526140-4-richard.henderson@linaro.org>
2023-11-06tcg/loongarch64: Use C_N2_I1 for INDEX_op_qemu_ld_a*_i128Richard Henderson
Use new registers for the output, so that we never overlap the input address, which could happen for user-only. This avoids a "tmp = addr + 0" in that case. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Jiajie Chen <c@jia.je> Message-Id: <20230916220151.526140-3-richard.henderson@linaro.org>
2023-11-06tcg: Add C_N2_I1Richard Henderson
Constraint with two outputs, both in new registers. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Jiajie Chen <c@jia.je> Message-Id: <20230916220151.526140-2-richard.henderson@linaro.org>
2023-11-06accel/tcg: Move HMP info jit and info opcount codeRichard Henderson
Move all of it into accel/tcg/monitor.c. This puts everything about tcg that is only used by the monitor in the same place. Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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