KVM: use desc_ptr struct instead of kvm private descriptor_table

x86 arch defines desc_ptr for idt/gdt pointers, no need to define
another structure in kvm code.
Signed-off-by: NGleb Natapov <gleb@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -461,11 +461,6 @@ struct kvm_vcpu_stat {
 	u32 nmi_injections;
 };
 
-struct descriptor_table {
-	u16 limit;
-	unsigned long base;
-} __attribute__((packed));
-
 struct kvm_x86_ops {
 	int (*cpu_has_kvm_support)(void);          /* __init */
 	int (*disabled_by_bios)(void);             /* __init */
@@ -503,10 +498,10 @@ struct kvm_x86_ops {
 	void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 	void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 	void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
-	void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
-	void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
-	void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
-	void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
+	void (*get_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
+	void (*set_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
+	void (*get_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
+	void (*set_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 	int (*get_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long *dest);
 	int (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value);
 	void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
@@ -724,12 +719,12 @@ static inline void kvm_load_ldt(u16 sel)
 	asm("lldt %0" : : "rm"(sel));
 }
 
-static inline void kvm_get_idt(struct descriptor_table *table)
+static inline void kvm_get_idt(struct desc_ptr *table)
 {
 	asm("sidt %0" : "=m"(*table));
 }
 
-static inline void kvm_get_gdt(struct descriptor_table *table)
+static inline void kvm_get_gdt(struct desc_ptr *table)
 {
 	asm("sgdt %0" : "=m"(*table));
 }

arch/x86/kvm/svm.c

@@ -319,7 +319,7 @@ static int svm_hardware_enable(void *garbage)
 
 	struct svm_cpu_data *sd;
 	uint64_t efer;
-	struct descriptor_table gdt_descr;
+	struct desc_ptr gdt_descr;
 	struct desc_struct *gdt;
 	int me = raw_smp_processor_id();
 
@@ -345,7 +345,7 @@ static int svm_hardware_enable(void *garbage)
 	sd->next_asid = sd->max_asid + 1;
 
 	kvm_get_gdt(&gdt_descr);
-	gdt = (struct desc_struct *)gdt_descr.base;
+	gdt = (struct desc_struct *)gdt_descr.address;
 	sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
 
 	wrmsrl(MSR_EFER, efer | EFER_SVME);
@@ -936,36 +936,36 @@ static int svm_get_cpl(struct kvm_vcpu *vcpu)
 	return save->cpl;
 }
 
-static void svm_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 
-	dt->limit = svm->vmcb->save.idtr.limit;
-	dt->base = svm->vmcb->save.idtr.base;
+	dt->size = svm->vmcb->save.idtr.limit;
+	dt->address = svm->vmcb->save.idtr.base;
 }
 
-static void svm_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 
-	svm->vmcb->save.idtr.limit = dt->limit;
-	svm->vmcb->save.idtr.base = dt->base ;
+	svm->vmcb->save.idtr.limit = dt->size;
+	svm->vmcb->save.idtr.base = dt->address ;
 }
 
-static void svm_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 
-	dt->limit = svm->vmcb->save.gdtr.limit;
-	dt->base = svm->vmcb->save.gdtr.base;
+	dt->size = svm->vmcb->save.gdtr.limit;
+	dt->address = svm->vmcb->save.gdtr.base;
 }
 
-static void svm_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 
-	svm->vmcb->save.gdtr.limit = dt->limit;
-	svm->vmcb->save.gdtr.base = dt->base ;
+	svm->vmcb->save.gdtr.limit = dt->size;
+	svm->vmcb->save.gdtr.base = dt->address ;
 }
 
 static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)

arch/x86/kvm/vmx.c

@@ -600,11 +600,11 @@ static void reload_tss(void)
 	/*
 	 * VT restores TR but not its size.  Useless.
 	 */
-	struct descriptor_table gdt;
+	struct desc_ptr gdt;
 	struct desc_struct *descs;
 
 	kvm_get_gdt(&gdt);
-	descs = (void *)gdt.base;
+	descs = (void *)gdt.address;
 	descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
 	load_TR_desc();
 }
@@ -758,7 +758,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	}
 
 	if (vcpu->cpu != cpu) {
-		struct descriptor_table dt;
+		struct desc_ptr dt;
 		unsigned long sysenter_esp;
 
 		vcpu->cpu = cpu;
@@ -768,7 +768,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 		 */
 		vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
 		kvm_get_gdt(&dt);
-		vmcs_writel(HOST_GDTR_BASE, dt.base);   /* 22.2.4 */
+		vmcs_writel(HOST_GDTR_BASE, dt.address);   /* 22.2.4 */
 
 		rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
 		vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
@@ -1934,28 +1934,28 @@ static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
 	*l = (ar >> 13) & 1;
 }
 
-static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
 {
-	dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
-	dt->base = vmcs_readl(GUEST_IDTR_BASE);
+	dt->size = vmcs_read32(GUEST_IDTR_LIMIT);
+	dt->address = vmcs_readl(GUEST_IDTR_BASE);
 }
 
-static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
 {
-	vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
-	vmcs_writel(GUEST_IDTR_BASE, dt->base);
+	vmcs_write32(GUEST_IDTR_LIMIT, dt->size);
+	vmcs_writel(GUEST_IDTR_BASE, dt->address);
 }
 
-static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
 {
-	dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
-	dt->base = vmcs_readl(GUEST_GDTR_BASE);
+	dt->size = vmcs_read32(GUEST_GDTR_LIMIT);
+	dt->address = vmcs_readl(GUEST_GDTR_BASE);
 }
 
-static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
+static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
 {
-	vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
-	vmcs_writel(GUEST_GDTR_BASE, dt->base);
+	vmcs_write32(GUEST_GDTR_LIMIT, dt->size);
+	vmcs_writel(GUEST_GDTR_BASE, dt->address);
 }
 
 static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
@@ -2334,7 +2334,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
 	u32 junk;
 	u64 host_pat, tsc_this, tsc_base;
 	unsigned long a;
-	struct descriptor_table dt;
+	struct desc_ptr dt;
 	int i;
 	unsigned long kvm_vmx_return;
 	u32 exec_control;
@@ -2416,7 +2416,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
 	vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8);  /* 22.2.4 */
 
 	kvm_get_idt(&dt);
-	vmcs_writel(HOST_IDTR_BASE, dt.base);   /* 22.2.4 */
+	vmcs_writel(HOST_IDTR_BASE, dt.address);   /* 22.2.4 */
 
 	asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
 	vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */

arch/x86/kvm/x86.c

@@ -225,7 +225,7 @@ static void drop_user_return_notifiers(void *ignore)
 
 unsigned long segment_base(u16 selector)
 {
-	struct descriptor_table gdt;
+	struct desc_ptr gdt;
 	struct desc_struct *d;
 	unsigned long table_base;
 	unsigned long v;
@@ -234,7 +234,7 @@ unsigned long segment_base(u16 selector)
 		return 0;
 
 	kvm_get_gdt(&gdt);
-	table_base = gdt.base;
+	table_base = gdt.address;
 
 	if (selector & 4) {           /* from ldt */
 		u16 ldt_selector = kvm_read_ldt();
@@ -3949,14 +3949,14 @@ static u64 mk_cr_64(u64 curr_cr, u32 new_val)
 
 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
 {
-	struct descriptor_table dt = { limit, base };
+	struct desc_ptr dt = { limit, base };
 
 	kvm_x86_ops->set_gdt(vcpu, &dt);
 }
 
 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
 {
-	struct descriptor_table dt = { limit, base };
+	struct desc_ptr dt = { limit, base };
 
 	kvm_x86_ops->set_idt(vcpu, &dt);
 }
@@ -4581,7 +4581,7 @@ EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 				  struct kvm_sregs *sregs)
 {
-	struct descriptor_table dt;
+	struct desc_ptr dt;
 
 	vcpu_load(vcpu);
 
@@ -4596,11 +4596,11 @@ int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 	kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
 
 	kvm_x86_ops->get_idt(vcpu, &dt);
-	sregs->idt.limit = dt.limit;
-	sregs->idt.base = dt.base;
+	sregs->idt.limit = dt.size;
+	sregs->idt.base = dt.address;
 	kvm_x86_ops->get_gdt(vcpu, &dt);
-	sregs->gdt.limit = dt.limit;
-	sregs->gdt.base = dt.base;
+	sregs->gdt.limit = dt.size;
+	sregs->gdt.base = dt.address;
 
 	sregs->cr0 = kvm_read_cr0(vcpu);
 	sregs->cr2 = vcpu->arch.cr2;
@@ -4672,7 +4672,7 @@ static void seg_desct_to_kvm_desct(struct desc_struct *seg_desc, u16 selector,
 
 static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu,
 					  u16 selector,
-					  struct descriptor_table *dtable)
+					  struct desc_ptr *dtable)
 {
 	if (selector & 1 << 2) {
 		struct kvm_segment kvm_seg;
@@ -4680,10 +4680,10 @@ static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu,
 		kvm_get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR);
 
 		if (kvm_seg.unusable)
-			dtable->limit = 0;
+			dtable->size = 0;
 		else
-			dtable->limit = kvm_seg.limit;
-		dtable->base = kvm_seg.base;
+			dtable->size = kvm_seg.limit;
+		dtable->address = kvm_seg.base;
 	}
 	else
 		kvm_x86_ops->get_gdt(vcpu, dtable);
@@ -4693,7 +4693,7 @@ static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu,
 static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 					 struct desc_struct *seg_desc)
 {
-	struct descriptor_table dtable;
+	struct desc_ptr dtable;
 	u16 index = selector >> 3;
 	int ret;
 	u32 err;
@@ -4701,7 +4701,7 @@ static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 
 	get_segment_descriptor_dtable(vcpu, selector, &dtable);
 
-	if (dtable.limit < index * 8 + 7) {
+	if (dtable.size < index * 8 + 7) {
 		kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
 		return X86EMUL_PROPAGATE_FAULT;
 	}
@@ -4718,14 +4718,14 @@ static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 					 struct desc_struct *seg_desc)
 {
-	struct descriptor_table dtable;
+	struct desc_ptr dtable;
 	u16 index = selector >> 3;
 
 	get_segment_descriptor_dtable(vcpu, selector, &dtable);
 
-	if (dtable.limit < index * 8 + 7)
+	if (dtable.size < index * 8 + 7)
 		return 1;
-	return kvm_write_guest_virt(dtable.base + index*8, seg_desc, sizeof(*seg_desc), vcpu, NULL);
+	return kvm_write_guest_virt(dtable.address + index*8, seg_desc, sizeof(*seg_desc), vcpu, NULL);
 }
 
 static gpa_t get_tss_base_addr_write(struct kvm_vcpu *vcpu,
@@ -5204,15 +5204,15 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 {
 	int mmu_reset_needed = 0;
 	int pending_vec, max_bits;
-	struct descriptor_table dt;
+	struct desc_ptr dt;
 
 	vcpu_load(vcpu);
 
-	dt.limit = sregs->idt.limit;
-	dt.base = sregs->idt.base;
+	dt.size = sregs->idt.limit;
+	dt.address = sregs->idt.base;
 	kvm_x86_ops->set_idt(vcpu, &dt);
-	dt.limit = sregs->gdt.limit;
-	dt.base = sregs->gdt.base;
+	dt.size = sregs->gdt.limit;
+	dt.address = sregs->gdt.base;
 	kvm_x86_ops->set_gdt(vcpu, &dt);
 
 	vcpu->arch.cr2 = sregs->cr2;