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([187.11.154.63]) by smtp.gmail.com with ESMTPSA id b23-20020a056830105700b006b8c6eb962esm6149906otp.52.2023.08.02.11.01.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Aug 2023 11:01:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1690999268; x=1691604068; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=ZbCdS8/CIvr20XcpwDEnPJ9tjc+DYre0UOSVutoJ5Lk=; b=EBu0DJ43oTwVWvq6W4vDPfUYRgN5Mw8ZVyNlvdtelslyOf7tAM8fgJbT1z5QP6WQh8 y8vhpd2toLKXOs82YQh4/bx7uNmN+eY6ZwU8EAVSv8T906jGcy05w5d4s6IhNcpBPxlC KzU6Dpv0/fR6SAxcu04v0vhTjROQ+9KFHkwokU1WSIY9zL+5HkrPjMU0hMDWQATlRQUB 3aH3SMFbNOrgdla59nH2TDHfM5V+YAaah/nbyAdu1SrO9Jrlm94WXGUID5GoEFMv/5a1 JJAPx1sy0mMBfoGXcL3a17FbjyLt5Zz5Tx8Df2su/0CA1fIduCaNc0LCgMl908GNxfDq n35w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690999268; x=1691604068; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=ZbCdS8/CIvr20XcpwDEnPJ9tjc+DYre0UOSVutoJ5Lk=; b=lIYEDlj3xrkrVLARqDB0PIye48BazNIX8jWzwTu6V1OstwSze/HThcey7M1NTTlWwQ 9bmvzbPWw8VTMVuqEChbfRBA2S+B5mGwzO8SqX0pQQ9XjrNiQ/Ui+V5pEZKqNoVoFYDb 2T1mRfM+gt2Xi4vYbcHSNc7ZrnOayM3vMsm3bH6fU3vfwc/Xlu3Oh+TWwdN0mQtnPBzd SAnZYC/FoCBlvt8X1FriFuFHesP136Ib7m3QshpiJeLtSqyCmTeTPJr0lwnCP7t92SVA FpwbIsJbZCcdbIYRNi1ea4mt9Wp2AzBJwnYLEkLozuyezVwJhb9qWZn1sKxieMBWWbiR M8lQ== X-Gm-Message-State: ABy/qLYyUf6WHSWbZRBINLw75RNpSceHCtYwWgzEI2agsRIzFNZjxlNI 74sIBAfsBSiAVB3uIzWDarECeDXylwJalc/SXc0kTA== X-Google-Smtp-Source: APBJJlGgCQaaPj9xU2opLgitpkONCyQ3dKVYPoPYnWrlJcdP22LddhRbf728v6E1jeu/GFmidYeiXw== X-Received: by 2002:a9d:7554:0:b0:6b7:52ce:ff38 with SMTP id b20-20020a9d7554000000b006b752ceff38mr15540841otl.16.1690999268117; Wed, 02 Aug 2023 11:01:08 -0700 (PDT) From: Daniel Henrique Barboza To: qemu-devel@nongnu.org Cc: qemu-riscv@nongnu.org, alistair.francis@wdc.com, bmeng@tinylab.org, liweiwei@iscas.ac.cn, zhiwei_liu@linux.alibaba.com, palmer@rivosinc.com, Daniel Henrique Barboza Subject: [PATCH] target/riscv/kvm.c: fix mvendorid size in vcpu_set_machine_ids() Date: Wed, 2 Aug 2023 15:00:58 -0300 Message-ID: <20230802180058.281385-1-dbarboza@ventanamicro.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::32a; envelope-from=dbarboza@ventanamicro.com; helo=mail-ot1-x32a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ventanamicro.com) X-ZM-MESSAGEID: 1690999331878100001 Content-Type: text/plain; charset="utf-8" cpu->cfg.mvendorid is a 32 bit field and kvm_set_one_reg() always write a target_ulong val, i.e. a 64 bit field in a 64 bit host. Given that we're passing a pointer to the mvendorid field, the reg is reading 64 bits starting from mvendorid and going 32 bits in the next field, marchid. Here's an example: $ ./qemu-system-riscv64 -machine virt,accel=3Dkvm -m 2G -smp 1 \ -cpu rv64,marchid=3D0xab,mvendorid=3D0xcd,mimpid=3D0xef(...) (inside the guest) # cat /proc/cpuinfo processor : 0 hart : 0 isa : rv64imafdc_zicbom_zicboz_zihintpause_zbb_sstc mmu : sv57 mvendorid : 0xab000000cd marchid : 0xab mimpid : 0xef 'mvendorid' was written as a combination of 0xab (the value from the adjacent field, marchid) and its intended value 0xcd. Fix it by assigning cpu->cfg.mvendorid to a target_ulong var 'reg' and use it as input for kvm_set_one_reg(). Here's the result with this patch applied and using the same QEMU command line: # cat /proc/cpuinfo processor : 0 hart : 0 isa : rv64imafdc_zicbom_zicboz_zihintpause_zbb_sstc mmu : sv57 mvendorid : 0xcd marchid : 0xab mimpid : 0xef This bug affects only the generic (rv64) CPUs when running with KVM in a 64 bit env since the 'host' CPU does not allow the machine IDs to be changed via command line. Fixes: 1fb5a622f7 ("target/riscv: handle mvendorid/marchid/mimpid for KVM C= PUs") Signed-off-by: Daniel Henrique Barboza Acked-by: Alistair Francis Reviewed-by: Andrew Jones --- target/riscv/kvm.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c index 9d8a8982f9..b1fd2233c0 100644 --- a/target/riscv/kvm.c +++ b/target/riscv/kvm.c @@ -852,12 +852,19 @@ void kvm_arch_init_irq_routing(KVMState *s) static int kvm_vcpu_set_machine_ids(RISCVCPU *cpu, CPUState *cs) { CPURISCVState *env =3D &cpu->env; + target_ulong reg; uint64_t id; int ret; =20 id =3D kvm_riscv_reg_id(env, KVM_REG_RISCV_CONFIG, KVM_REG_RISCV_CONFIG_REG(mvendorid)); - ret =3D kvm_set_one_reg(cs, id, &cpu->cfg.mvendorid); + /* + * cfg.mvendorid is an uint32 but a target_ulong will + * be written. Assign it to a target_ulong var to avoid + * writing pieces of other cpu->cfg fields in the reg. + */ + reg =3D cpu->cfg.mvendorid; + ret =3D kvm_set_one_reg(cs, id, ®); if (ret !=3D 0) { return ret; } --=20 2.41.0