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From:   isaku.yamahata@intel.com
To:     linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>
Cc:     isaku.yamahata@intel.com, isaku.yamahata@gmail.com,
        Kai Huang <kai.huang@intel.com>, Chao Gao <chao.gao@intel.com>,
        Atish Patra <atishp@atishpatra.org>,
        Shaokun Zhang <zhangshaokun@hisilicon.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Huang Ying <ying.huang@intel.com>,
        Huacai Chen <chenhuacai@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Borislav Petkov <bp@alien8.de>, linuxppc-dev@lists.ozlabs.org,
        Fabiano Rosas <farosas@linux.ibm.com>
Subject: [PATCH v5 27/30] RFC: KVM: powerpc: Move processor compatibility check to hardware setup
Date:   Thu, 22 Sep 2022 11:20:56 -0700
Message-Id: <574ca90fdaec0f37c197d9600d47d48a74f324bd.1663869838.git.isaku.yamahata@intel.com>
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From: Isaku Yamahata <isaku.yamahata@intel.com>

Move processor compatibility check from kvm_arch_processor_compat() into
kvm_arch_hardware_setup().  The check does model name comparison with a
global variable, cur_cpu_spec.  There is no point to check it at run time
on all processors.

kvmppc_core_check_processor_compat() checks the global variable.  There are
five implementation for it as follows.

  arch/powerpc/include/asm/cputable.h: extern struct cpu_spec *cur_cpu_spec;
  arch/powerpc/kvm/book3s.c: return 0
  arch/powerpc/kvm/e500.c: strcmp(cur_cpu_spec->cpu_name, "e500v2")
  arch/powerpc/kvm/e500mc.c: strcmp(cur_cpu_spec->cpu_name, "e500mc")
                             strcmp(cur_cpu_spec->cpu_name, "e5500")
                             strcmp(cur_cpu_spec->cpu_name, "e6500")

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Fabiano Rosas <farosas@linux.ibm.com>
---
 arch/powerpc/kvm/powerpc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 7b56d6ccfdfb..31dc4f231e9d 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -444,12 +444,12 @@ int kvm_arch_hardware_enable(void)
 
 int kvm_arch_hardware_setup(void *opaque)
 {
-	return 0;
+	return kvmppc_core_check_processor_compat();
 }
 
 int kvm_arch_check_processor_compat(void)
 {
-	return kvmppc_core_check_processor_compat();
+	return 0;
 }
 
 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
-- 
2.25.1