On 04/27/2014 05:40 PM, Paolo Bonzini wrote:
> Il 27/04/2014 17:32, Toralf Förster ha scritto:
>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>> index 8b8fc0b..a6ca7e0 100644
>> --- a/arch/x86/kvm/x86.c
>> +++ b/arch/x86/kvm/x86.c
>> @@ -5680,15 +5680,17 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
>> kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
>> longmode = is_long_mode(vcpu) && cs_l == 1;
>>
>> +#ifdef CONFIG_X86_64
>> if (!longmode) {
>> +#endif
>
> This is ugly...
+1
>
>> param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
>> (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
>> ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
>> (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
>> outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
>> (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
>> - }
>> #ifdef CONFIG_X86_64
>
> ... can you just remove this #ifdef instead? It will be dead code, but
> the compiler will detect it as such and remove it.
>
ok, but VCPU_REGS_R8 is #ifdef'ed in arch/x86/include/asm/kvm_host.h around line 120 and therefore I get :
tfoerste@n22 ~/devel/linux $ sudo make modules
...
CHK include/config/kernel.release
CHK include/generated/uapi/linux/version.h
CHK include/generated/utsrelease.h
CALL scripts/checksyscalls.sh
CC [M] arch/x86/kvm/x86.o
arch/x86/kvm/x86.c: In function ‘kvm_hv_hypercall’:
arch/x86/kvm/x86.c:5694:36: error: ‘VCPU_REGS_R8’ undeclared (first use in this function)
arch/x86/kvm/x86.c:5694:36: note: each undeclared identifier is reported only once for each function it appears in
make[2]: *** [arch/x86/kvm/x86.o] Error 1
make[1]: *** [arch/x86/kvm] Error 2
make: *** [arch/x86] Error 2
> Paolo
>
>> + }
>> else {
>> param = kvm_register_read(vcpu, VCPU_REGS_RCX);
>> ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
>
>
--
Toralf
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