KVM: X86: Reduce size of kvm_vcpu_arch structure when CONFIG_KVM_XEN=n

When CONFIG_KVM_XEN=n, the size of kvm_vcpu_arch can be reduced
from 5100+ to 4400+ by adding macro control.

Signed-off-by: Peng Hao <flyingpeng@tencent.com>
Link: https://lore.kernel.org/all/CAPm50aKwbZGeXPK5uig18Br8CF1hOS71CE2j_dLX+ub7oJdpGg@mail.gmail.com
[sean: fix whitespace damage]
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 17715cb..d2a15ab 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -680,6 +680,7 @@ struct kvm_hypervisor_cpuid {
        u32 limit;
 };
 
+#ifdef CONFIG_KVM_XEN
 /* Xen HVM per vcpu emulation context */
 struct kvm_vcpu_xen {
        u64 hypercall_rip;
@@ -702,6 +703,7 @@ struct kvm_vcpu_xen {
        struct timer_list poll_timer;
        struct kvm_hypervisor_cpuid cpuid;
 };
+#endif
 
 struct kvm_queued_exception {
        bool pending;
@@ -930,8 +932,9 @@ struct kvm_vcpu_arch {
 
        bool hyperv_enabled;
        struct kvm_vcpu_hv *hyperv;
+#ifdef CONFIG_KVM_XEN
        struct kvm_vcpu_xen xen;
-
+#endif
        cpumask_var_t wbinvd_dirty_mask;
 
        unsigned long last_retry_eip;

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 0544e30..48f5308 100644 (file)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -456,7 +456,9 @@ static int kvm_set_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2 *e2,
        vcpu->arch.cpuid_nent = nent;
 
        vcpu->arch.kvm_cpuid = kvm_get_hypervisor_cpuid(vcpu, KVM_SIGNATURE);
+#ifdef CONFIG_KVM_XEN
        vcpu->arch.xen.cpuid = kvm_get_hypervisor_cpuid(vcpu, XEN_SIGNATURE);
+#endif
        kvm_vcpu_after_set_cpuid(vcpu);
 
        return 0;

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9f18b06..a3a02d6 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3232,11 +3232,13 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
 
        if (vcpu->pv_time.active)
                kvm_setup_guest_pvclock(v, &vcpu->pv_time, 0);
+#ifdef CONFIG_KVM_XEN
        if (vcpu->xen.vcpu_info_cache.active)
                kvm_setup_guest_pvclock(v, &vcpu->xen.vcpu_info_cache,
                                        offsetof(struct compat_vcpu_info, time));
        if (vcpu->xen.vcpu_time_info_cache.active)
                kvm_setup_guest_pvclock(v, &vcpu->xen.vcpu_time_info_cache, 0);
+#endif
        kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock);
        return 0;
 }