linux-kernel - Re: [PATCH RESEND v2] KVM: X86: Implement PV sched yield hypercall

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Date:   Tue, 28 May 2019 14:08:16 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH RESEND v2] KVM: X86: Implement PV sched yield hypercall

Hi Wanpeng,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kvm/linux-next]
[also build test ERROR on v5.2-rc2 next-20190524]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Wanpeng-Li/KVM-X86-Implement-PV-sched-yield-hypercall/20190528-132021
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   arch/x86//kvm/x86.c: In function 'kvm_emulate_hypercall':
>> arch/x86//kvm/x86.c:7243:7: error: 'KVM_HC_SCHED_YIELD' undeclared (first use in this function); did you mean 'KVM_HC_SEND_IPI'?
     case KVM_HC_SCHED_YIELD:
          ^~~~~~~~~~~~~~~~~~
          KVM_HC_SEND_IPI
   arch/x86//kvm/x86.c:7243:7: note: each undeclared identifier is reported only once for each function it appears in

vim +7243 arch/x86//kvm/x86.c

  7196	
  7197	int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
  7198	{
  7199		unsigned long nr, a0, a1, a2, a3, ret;
  7200		int op_64_bit;
  7201	
  7202		if (kvm_hv_hypercall_enabled(vcpu->kvm))
  7203			return kvm_hv_hypercall(vcpu);
  7204	
  7205		nr = kvm_rax_read(vcpu);
  7206		a0 = kvm_rbx_read(vcpu);
  7207		a1 = kvm_rcx_read(vcpu);
  7208		a2 = kvm_rdx_read(vcpu);
  7209		a3 = kvm_rsi_read(vcpu);
  7210	
  7211		trace_kvm_hypercall(nr, a0, a1, a2, a3);
  7212	
  7213		op_64_bit = is_64_bit_mode(vcpu);
  7214		if (!op_64_bit) {
  7215			nr &= 0xFFFFFFFF;
  7216			a0 &= 0xFFFFFFFF;
  7217			a1 &= 0xFFFFFFFF;
  7218			a2 &= 0xFFFFFFFF;
  7219			a3 &= 0xFFFFFFFF;
  7220		}
  7221	
  7222		if (kvm_x86_ops->get_cpl(vcpu) != 0) {
  7223			ret = -KVM_EPERM;
  7224			goto out;
  7225		}
  7226	
  7227		switch (nr) {
  7228		case KVM_HC_VAPIC_POLL_IRQ:
  7229			ret = 0;
  7230			break;
  7231		case KVM_HC_KICK_CPU:
  7232			kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1);
  7233			ret = 0;
  7234			break;
  7235	#ifdef CONFIG_X86_64
  7236		case KVM_HC_CLOCK_PAIRING:
  7237			ret = kvm_pv_clock_pairing(vcpu, a0, a1);
  7238			break;
  7239	#endif
  7240		case KVM_HC_SEND_IPI:
  7241			ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit);
  7242			break;
> 7243		case KVM_HC_SCHED_YIELD:
  7244			kvm_sched_yield(vcpu->kvm, a0);
  7245			ret = 0;
  7246			break;
  7247		default:
  7248			ret = -KVM_ENOSYS;
  7249			break;
  7250		}
  7251	out:
  7252		if (!op_64_bit)
  7253			ret = (u32)ret;
  7254		kvm_rax_write(vcpu, ret);
  7255	
  7256		++vcpu->stat.hypercalls;
  7257		return kvm_skip_emulated_instruction(vcpu);
  7258	}
  7259	EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
  7260	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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