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Thu, 25 Jun 2026 22:12:13 -0700 (PDT) From: Charlie Jenkins Date: Thu, 25 Jun 2026 22:12:02 -0700 Subject: [PATCH v2] target/riscv: Report QEMU CPU archid as 42 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260625-marchid-v2-1-3821c351028b@gmail.com> X-B4-Tracking: v=1; b=H4sIAAAAAAAC/2WNQQ7CIBQFr9L8tRhAU6gr72G6oEDLN7YYqETTc HehLl1OMm/eBtEGtBEuzQbBJozolwL80IB2apksQVMYOOUtbfmZzCpoh4ZIaphoBylORkKxn8G O+N5Lt/7H8TXcrV7rvBoO4+rDZ79KrHr/1cQII4qqUXSdoIKN12lW+DhqP0Ofc/4CicF837AAA AA= X-Change-ID: 20260624-marchid-80d176b873d8 To: qemu-devel@nongnu.org Cc: Palmer Dabbelt , Alistair Francis , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Chao Liu , Atish Patra , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , qemu-riscv@nongnu.org, Charlie Jenkins X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1782450732; l=3222; i=thecharlesjenkins@gmail.com; s=20260605; h=from:subject:message-id; bh=uZOfbuZy0m8/ljZTlYxED39bWhMad3LiJsjUokNTdLE=; 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This can help software check if it is running in QEMU. [1] https://github.com/riscv/riscv-isa-manual/blob/main/marchid.md Signed-off-by: Charlie Jenkins Acked-by: Alistair Francis Reviewed-by: Alistair Francis Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- This series was original proposed by Palmer Dabbelt [1] with a follow up by Daniel Henrique Barboza. This patch implement's Daniel's suggestion. When booting with a non-vendor CPU such as with the qemu arg "-cpu rv64" marchid will now be reported as 42. > qemu-system-riscv64 ... -cpu rv64 processor : 0 hart : 0 isa : rv64imafdch_zicbom_zicbop_zicboz_ziccrse_zicntr_zicsr_zif= encei_zihintntl_zihintpause_zihpm_zaamo_zalrsc_zawrs_zfa_zca_zcd_zba_zbb_zb= c_zbs_sstc_svadu_svvptc mmu : sv57 mvendorid : 0x0 marchid : 0x2a mimpid : 0x0 hart isa : rv64imafdch_zicbom_zicbop_zicboz_ziccrse_zicntr_zicsr_zif= encei_zihintntl_zihintpause_zihpm_zaamo_zalrsc_zawrs_zfa_zca_zcd_zba_zbb_zb= c_zbs_sstc_svadu_svvptc When booting with a vendor CPU like veyron-v1, the proper marchid will still appear. > qemu-system-riscv64 ... -cpu veyron-v1 processor : 0 hart : 0 isa : rv64imafdch_zicbom_zicboz_ziccrse_zicntr_zicsr_zifencei_z= ihpm_zaamo_zalrsc_zca_zcd_zba_zbb_zbc_zbs_smaia_smstateen_ssaia_sscofpmf_ss= tc_svinval_svnapot_svpbmt mmu : sv48 mvendorid : 0x61f marchid : 0x8000000000010000 mimpid : 0x111 hart isa : rv64imafdch_zicbom_zicboz_ziccrse_zicntr_zicsr_zifencei_z= ihpm_zaamo_zalrsc_zca_zcd_zba_zbb_zbc_zbs_smaia_smstateen_ssaia_sscofpmf_ss= tc_svinval_svnapot_svpbmt [1] https://lore.kernel.org/all/20240131182430.20174-1-palmer@rivosinc.com/ --- Changes in v2: - Added comment linking the spec allocating 42 to marchid - Cleaned up the id setting - Link to v1: https://lore.kernel.org/qemu-devel/20260624-marchid-v1-1-a0af= 7997071f@gmail.com --- target/riscv/cpu.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index fa497e5e8a..94946d335f 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -47,6 +47,13 @@ static const char riscv_single_letter_exts[] =3D "IEMAFDQCBPVH"; const uint32_t misa_bits[] =3D {RVI, RVE, RVM, RVA, RVF, RVD, RVV, RVC, RVS, RVU, RVH, RVG, RVB, 0}; +#define RISCV_CPU_MVENDORID 0 +#define RISCV_CPU_MIMPID 0 +/* + * marchid allocated for qemu: + * https://github.com/riscv/riscv-isa-manual/blob/main/marchid.md + */ +#define RISCV_CPU_MARCHID 42 =20 /* * From vector_helper.c @@ -1183,6 +1190,10 @@ static void riscv_cpu_init(Object *obj) mcc->def->profile->enabled =3D true; } =20 + cpu->cfg.mvendorid =3D RISCV_CPU_MVENDORID; + cpu->cfg.marchid =3D RISCV_CPU_MARCHID; + cpu->cfg.mimpid =3D RISCV_CPU_MIMPID; + env->misa_ext_mask =3D env->misa_ext =3D mcc->def->misa_ext; riscv_cpu_cfg_merge(&cpu->cfg, &mcc->def->cfg); =20 --- base-commit: b83371668192a705b878e909c5ae9c1233cbd5fb change-id: 20260624-marchid-80d176b873d8 Best regards, -- =20 - Charlie