KVM: x86: Propagate fpu_alloc errors

Memory allocation may fail. Propagate such errors.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

4 files changed, 19 insertions, 5 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d08bb4a202de..0cd0f2923af5 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -624,7 +624,7 @@ int kvm_pic_set_irq(void *opaque, int irq, int level);
 
 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 
-void fx_init(struct kvm_vcpu *vcpu);
+int fx_init(struct kvm_vcpu *vcpu);
 
 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 9c68a650f57e..2ae0c3923293 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -904,13 +904,18 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
         svm->asid_generation = 0;
         init_vmcb(svm);
 
-        fx_init(&svm->vcpu);
+        err = fx_init(&svm->vcpu);
+        if (err)
+                goto free_page4;
+
         svm->vcpu.arch.apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
         if (kvm_vcpu_is_bsp(&svm->vcpu))
                 svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
 
         return &svm->vcpu;
 
+free_page4:
+        __free_page(hsave_page);
 free_page3:
         __free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
 free_page2:
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9c3ffc5fde44..e71c731433ee 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2659,7 +2659,9 @@ static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
                 msr |= MSR_IA32_APICBASE_BSP;
         kvm_set_apic_base(&vmx->vcpu, msr);
 
-        fx_init(&vmx->vcpu);
+        ret = fx_init(&vmx->vcpu);
+        if (ret != 0)
+                goto out;
 
         seg_setup(VCPU_SREG_CS);
         /*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 033b9c207f93..e6e0d7781af7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5114,12 +5114,19 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
         return 0;
 }
 
-void fx_init(struct kvm_vcpu *vcpu)
+int fx_init(struct kvm_vcpu *vcpu)
 {
-        fpu_alloc(&vcpu->arch.guest_fpu);
+        int err;
+
+        err = fpu_alloc(&vcpu->arch.guest_fpu);
+        if (err)
+                return err;
+
         fpu_finit(&vcpu->arch.guest_fpu);
 
         vcpu->arch.cr0 |= X86_CR0_ET;
+
+        return 0;
 }
 EXPORT_SYMBOL_GPL(fx_init);