From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 8C89CA23 for ; Tue, 21 Feb 2023 02:56:31 +0000 (UTC) Received: from loongson.cn (unknown [10.20.42.120]) by gateway (Coremail) with SMTP id _____8DxldjcMvRj0AUDAA--.5895S3; Tue, 21 Feb 2023 10:56:28 +0800 (CST) Received: from [10.20.42.120] (unknown [10.20.42.120]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxG77ZMvRj3343AA--.35199S3; Tue, 21 Feb 2023 10:56:25 +0800 (CST) Subject: Re: [PATCH v2 01/29] LoongArch: KVM: Add kvm related header files To: Paolo Bonzini References: <20230220065735.1282809-1-zhaotianrui@loongson.cn> <20230220065735.1282809-2-zhaotianrui@loongson.cn> <2b047b75-7397-0cce-e7af-ebba67ae2561@redhat.com> Cc: Huacai Chen , WANG Xuerui , Greg Kroah-Hartman , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Jens Axboe , Mark Brown , Alex Deucher , Oliver Upton , maobibo@loongson.cn From: Tianrui Zhao Message-ID: Date: Tue, 21 Feb 2023 10:56:25 +0800 User-Agent: Mozilla/5.0 (X11; Linux mips64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 Precedence: bulk X-Mailing-List: loongarch@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <2b047b75-7397-0cce-e7af-ebba67ae2561@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-CM-TRANSID:AQAAf8CxG77ZMvRj3343AA--.35199S3 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoWxGF13Gw1xZF1DJw1kKryUJrb_yoW5ZFWkpa 48Cw4xKr4UXryUKr1xXrn5XasIqrZrtr1ayFsxt3W3Ja4q93W8Cr4kGa4UuF4xJrykXa17 Aa4UKrnxuFs8ta7anT9S1TB71UUUUj7qnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bqxYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW8JVW5JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4 x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v26r4UJVWxJr1l n4kS14v26r126r1DM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6x ACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r126r1DMcIj6I8E 87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IY64vIr41lc7I2V7IY0V AS07AlzVAYIcxG8wCY1x0262kKe7AKxVWUAVWUtwCF04k20xvY0x0EwIxGrwCFx2IqxVCF s4IE7xkEbVWUJVW8JwCFI7km07C267AKxVWUAVWUtwC20s026c02F40E14v26r1j6r18MI 8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41l IxAIcVC0I7IYx2IY67AKxVWUCVW8JwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Jr0_Gr1lIx AIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2 jsIEc7CjxVAFwI0_Jr0_GrUvcSsGvfC2KfnxnUUI43ZEXa7IU8Dl1DUUUUU== 在 2023年02月21日 02:22, Paolo Bonzini 写道: > On 2/20/23 07:57, Tianrui Zhao wrote: >> + >> +/* Resume Flags */ >> +#define RESUME_FLAG_DR (1<<0) /* Reload guest nonvolatile >> state? */ >> +#define RESUME_FLAG_HOST (1<<1) /* Resume host? */ >> + >> +#define RESUME_GUEST 0 >> +#define RESUME_GUEST_DR RESUME_FLAG_DR >> +#define RESUME_HOST RESUME_FLAG_HOST >> + > > Most of this code is dead, I'll give more instructions in a reply to > patch 8. > >> + unsigned long guest_eentry; >> + unsigned long host_eentry; >> + int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu); >> + int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu); >> + >> + /* Host registers preserved across guest mode execution */ >> + unsigned long host_stack; >> + unsigned long host_gp; >> + unsigned long host_pgd; >> + unsigned long host_pgdhi; >> + unsigned long host_entryhi; >> + >> + /* Host CSR registers used when handling exits from guest */ >> + unsigned long badv; >> + unsigned long host_estat; >> + unsigned long badi; >> + unsigned long host_ecfg; >> + unsigned long host_percpu; >> + >> + /* GPRS */ >> + unsigned long gprs[32]; >> + unsigned long pc; >> + >> + /* FPU State */ >> + struct loongarch_fpu fpu FPU_ALIGN; >> + /* Which auxiliary state is loaded (KVM_LOONGARCH_AUX_*) */ >> + unsigned int aux_inuse; >> + >> + /* CSR State */ >> + struct loongarch_csrs *csr; >> + >> + /* GPR used as IO source/target */ >> + u32 io_gpr; >> + >> + struct hrtimer swtimer; >> + /* Count timer control KVM register */ >> + u32 count_ctl; >> + >> + /* Bitmask of exceptions that are pending */ >> + unsigned long irq_pending; >> + /* Bitmask of pending exceptions to be cleared */ >> + unsigned long irq_clear; >> + >> + /* Cache some mmu pages needed inside spinlock regions */ >> + struct kvm_mmu_memory_cache mmu_page_cache; >> + >> + /* vcpu's vpid is different on each host cpu in an smp system */ >> + u64 vpid[NR_CPUS]; > > In _kvm_check_vmid(), you already have > > + if (migrated || (ver != old)) { > + _kvm_update_vpid(vcpu, cpu); > + trace_kvm_vpid_change(vcpu, vcpu->arch.vpid[cpu]); > + } > > so a vpid will never be recycled if a vCPU migrates from physical CPU > A to B and back to A. > > So please keep the current VPID in the per-cpu struct vmcs, and you > can just copy it from there in _kvm_check_vmid(). Thanks, that is to say we should remove the vpid[NR_CPUS] array and it is enough to use only one vpid variable? Thanks Tianrui Zhao > >> + /* Period of stable timer tick in ns */ >> + u64 timer_period; >> + /* Frequency of stable timer in Hz */ >> + u64 timer_mhz; >> + /* Stable bias from the raw time */ >> + u64 timer_bias; >> + /* Dynamic nanosecond bias (multiple of timer_period) to avoid >> overflow */ >> + s64 timer_dyn_bias; >> + /* Save ktime */ >> + ktime_t stable_ktime_saved; >> + >> + u64 core_ext_ioisr[4]; >> + >> + /* Last CPU the VCPU state was loaded on */ >> + int last_sched_cpu; >> + /* Last CPU the VCPU actually executed guest code on */ >> + int last_exec_cpu; >> + >> + u8 fpu_enabled; > > This field is always true, please remove it. Thanks, i will remove this variable. Thanks Tianrui Zhao > >> + struct kvm_guest_debug_arch guest_debug; > > This struct is empty, please remove it. Ok, I will remove it. Thanks Tianrui Zhao > > Paolo