[PATCH] powerpc/kvm: Enable support for ISA v3.1 guests

[kbuild test robot]

Hi Alistair,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on v5.7 next-20200529]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Alistair-Popple/powerpc-kvm-Enable-support-for-ISA-v3-1-guests/20200602-140435
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-defconfig (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp at intel.com>

All error/warnings (new ones prefixed by >>, old ones prefixed by <<):

arch/powerpc/kvm/book3s_hv.c: In function 'kvmppc_set_arch_compat':
<<                  from arch/powerpc/kvm/book3s_hv.c:81:
>> arch/powerpc/kvm/book3s_hv.c:356:22: error: 'CPU_FTR_ARCH_31' undeclared (first use in this function); did you mean 'CPU_FTR_ARCH_300'?
356 |  if (cpu_has_feature(CPU_FTR_ARCH_31))
|                      ^~~~~~~~~~~~~~~
|                      CPU_FTR_ARCH_300
arch/powerpc/kvm/book3s_hv.c:356:22: note: each undeclared identifier is reported only once for each function it appears in
<<                  from arch/powerpc/kvm/book3s_hv.c:81:
>> arch/powerpc/kvm/book3s_hv.c:348:25: error: 'PCR_ARCH_300' undeclared (first use in this function); did you mean 'PVR_ARCH_300'?
348 | #define PCR_ARCH_31    (PCR_ARCH_300 << 1)
|                         ^~~~~~~~~~~~
<<                  from arch/powerpc/kvm/book3s_hv.c:81:
>> arch/powerpc/kvm/book3s_hv.c:357:18: note: in expansion of macro 'PCR_ARCH_31'
357 |   host_pcr_bit = PCR_ARCH_31;
|                  ^~~~~~~~~~~
arch/powerpc/kvm/book3s_hv.c: At top level:
arch/powerpc/kvm/book3s_hv.c:3521:5: error: no previous prototype for 'kvmhv_p9_guest_entry' [-Werror=missing-prototypes]
3521 | int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
|     ^~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

vim +356 arch/powerpc/kvm/book3s_hv.c

   346	
   347	/* Dummy value used in computing PCR value below */
 > 348	#define PCR_ARCH_31    (PCR_ARCH_300 << 1)
   349	
   350	static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
   351	{
   352		unsigned long host_pcr_bit = 0, guest_pcr_bit = 0;
   353		struct kvmppc_vcore *vc = vcpu->arch.vcore;
   354	
   355		/* We can (emulate) our own architecture version and anything older */
 > 356		if (cpu_has_feature(CPU_FTR_ARCH_31))
 > 357			host_pcr_bit = PCR_ARCH_31;
   358		else if (cpu_has_feature(CPU_FTR_ARCH_300))
   359			host_pcr_bit = PCR_ARCH_300;
   360		else if (cpu_has_feature(CPU_FTR_ARCH_207S))
   361			host_pcr_bit = PCR_ARCH_207;
   362		else if (cpu_has_feature(CPU_FTR_ARCH_206))
   363			host_pcr_bit = PCR_ARCH_206;
   364		else
   365			host_pcr_bit = PCR_ARCH_205;
   366	
   367		/* Determine lowest PCR bit needed to run guest in given PVR level */
   368		guest_pcr_bit = host_pcr_bit;
   369		if (arch_compat) {
   370			switch (arch_compat) {
   371			case PVR_ARCH_205:
   372				guest_pcr_bit = PCR_ARCH_205;
   373				break;
   374			case PVR_ARCH_206:
   375			case PVR_ARCH_206p:
   376				guest_pcr_bit = PCR_ARCH_206;
   377				break;
   378			case PVR_ARCH_207:
   379				guest_pcr_bit = PCR_ARCH_207;
   380				break;
   381			case PVR_ARCH_300:
   382				guest_pcr_bit = PCR_ARCH_300;
   383				break;
   384			case PVR_ARCH_31:
   385				guest_pcr_bit = PCR_ARCH_31;
   386				break;
   387			default:
   388				return -EINVAL;
   389			}
   390		}
   391	
   392		/* Check requested PCR bits don't exceed our capabilities */
   393		if (guest_pcr_bit > host_pcr_bit)
   394			return -EINVAL;
   395	
   396		spin_lock(&vc->lock);
   397		vc->arch_compat = arch_compat;
   398		/*
   399		 * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit
   400		 * Also set all reserved PCR bits
   401		 */
   402		vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK;
   403		spin_unlock(&vc->lock);
   404	
   405		return 0;
   406	}
   407	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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