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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729851729; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zbD69XCuYcyIs0z1Iu29EwF5abMuXv4H1xcBzN781Yc=; b=PTMqSo1EQqobM00GTZQEr2LM0Fwh1WKDPhrzI1izP2dhUb9h9TEbPBpUYE68byABge40mi NsJqhxUSrn4E0A+0uqhGEezxIjIi4XoYb6fZFaBA/VUXIBk2vX/mLKlBDVhHRdZy1kYqCw g/nprJcLUfdrfgsGCBD2dEAit//0CK8= X-MC-Unique: o-9TlUjEPHCugcPwj0ipvw-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, cohuck@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, kvmarm@lists.linux.dev, peter.maydell@linaro.org, richard.henderson@linaro.org, alex.bennee@linaro.org, maz@kernel.org, oliver.upton@linux.dev, sebott@redhat.com, shameerali.kolothum.thodi@huawei.com, armbru@redhat.com, berrange@redhat.com, abologna@redhat.com, jdenemar@redhat.com Cc: shahuang@redhat.com, mark.rutland@arm.com, philmd@linaro.org, pbonzini@redhat.com Subject: [RFC 17/21] arm/kvm: write back modified ID regs to KVM Date: Fri, 25 Oct 2024 12:17:36 +0200 Message-ID: <20241025101959.601048-18-eric.auger@redhat.com> In-Reply-To: <20241025101959.601048-1-eric.auger@redhat.com> References: <20241025101959.601048-1-eric.auger@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" We want to give a chance to override the value of host ID regs. In a previous patch we made sure all their values could be fetched through kvm_get_one_reg() calls before their modification. After their potential modification we need to make sure we write back the values through kvm_set_one_reg() calls. Make sure the cpreg_list is modified with updated values and transfer those values back to kvm. Signed-off-by: Eric Auger --- target/arm/kvm.c | 36 +++++++++++++++++++++++++++++++++++- target/arm/trace-events | 1 + 2 files changed, 36 insertions(+), 1 deletion(-) diff --git a/target/arm/kvm.c b/target/arm/kvm.c index a0daf4c382..b63578789d 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -1052,6 +1052,31 @@ void kvm_arm_cpu_post_load(ARMCPU *cpu) } } =20 +static void kvm_arm_writable_idregs_to_cpreg_list(ARMCPU *cpu) +{ + for (int i =3D 0; i < NR_ID_REGS; i++) { + uint64_t writable_mask =3D cpu->writable_map->regs[i]; + uint64_t *cpreg; + + if (writable_mask) { + uint64_t regidx; + uint64_t previous, new; + ARM64SysReg *sysregdesc =3D &arm64_id_regs[i]; + ARMSysReg *sr =3D sysregdesc->sysreg; + + regidx =3D ARM64_SYS_REG(sr->op0, sr->op1, sr->crn, sr->crm, s= r->op2); + cpreg =3D kvm_arm_get_cpreg_ptr(cpu, regidx); + previous =3D *cpreg; + new =3D cpu->isar.idregs.regs[i]; + if (previous !=3D new) { + *cpreg =3D new; + trace_kvm_arm_writable_idregs_to_cpreg_list(sysregdesc->na= me, + previous, new); + } + } + } +} + void kvm_arm_reset_vcpu(ARMCPU *cpu) { int ret; @@ -2019,7 +2044,16 @@ int kvm_arch_init_vcpu(CPUState *cs) } cpu->mp_affinity =3D mpidr & ARM64_AFFINITY_MASK; =20 - return kvm_arm_init_cpreg_list(cpu); + ret =3D kvm_arm_init_cpreg_list(cpu); + if (ret) { + return ret; + } + /* overwrite writable ID regs with their updated property values */ + kvm_arm_writable_idregs_to_cpreg_list(cpu); + + write_list_to_kvmstate(cpu, 3); + + return 0; } =20 int kvm_arch_destroy_vcpu(CPUState *cs) diff --git a/target/arm/trace-events b/target/arm/trace-events index 0df3bfafff..668acf94ab 100644 --- a/target/arm/trace-events +++ b/target/arm/trace-events @@ -14,3 +14,4 @@ arm_gt_update_irq(int timer, int irqstate) "gt_update_irq= : timer %d irqstate %d" # kvm.c kvm_arm_fixup_msi_route(uint64_t iova, uint64_t gpa) "MSI iova =3D 0x%"PRI= x64" is translated into 0x%"PRIx64 get_host_cpu_idregs(const char *name, uint64_t value) "scratch vcpu gost v= alue for %s is 0x%"PRIx64 +kvm_arm_writable_idregs_to_cpreg_list(const char *name, uint64_t previous,= uint64_t new) "%s overwrite default 0x%"PRIx64" with 0x%"PRIx64 --=20 2.41.0