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From:   Maxim Levitsky <mlevitsk@redhat.com>
To:     kvm@vger.kernel.org
Cc:     Paolo Bonzini <pbonzini@redhat.com>,
        Yang Zhong <yang.zhong@intel.com>,
        linux-kselftest@vger.kernel.org, Kees Cook <keescook@chromium.org>,
        Borislav Petkov <bp@alien8.de>,
        Guang Zeng <guang.zeng@intel.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Maxim Levitsky <mlevitsk@redhat.com>,
        Joerg Roedel <joro@8bytes.org>, linux-kernel@vger.kernel.org,
        Wei Wang <wei.w.wang@intel.com>,
        Jim Mattson <jmattson@google.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Sean Christopherson <seanjc@google.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>, x86@kernel.org,
        Shuah Khan <shuah@kernel.org>
Subject: [PATCH v4 07/23] KVM: x86: remove SMRAM address space if SMM is not supported
Date:   Tue, 25 Oct 2022 15:42:07 +0300
Message-Id: <20221025124223.227577-8-mlevitsk@redhat.com>
In-Reply-To: <20221025124223.227577-1-mlevitsk@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>

If CONFIG_KVM_SMM is not defined HF_SMM_MASK will always be zero, and
we can spare userspace the hassle of setting up the SMRAM address space
simply by reporting that only one address space is supported.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/include/asm/kvm_host.h | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 541ed36cbb82f8..28e41926027e7a 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1995,11 +1995,14 @@ enum {
 #define HF_SMM_MASK		(1 << 6)
 #define HF_SMM_INSIDE_NMI_MASK	(1 << 7)
 
-#define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
-#define KVM_ADDRESS_SPACE_NUM 2
-
-#define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
-#define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
+#ifdef CONFIG_KVM_SMM
+# define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
+# define KVM_ADDRESS_SPACE_NUM 2
+# define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
+# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
+#else
+# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, 0)
+#endif
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
 
-- 
2.34.3