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: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

4 files changed, 61 insertions, 66 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 06d9e79ca37d..cf392dfb8000 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/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));
 }
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2ba58206812a..77fa2e3053b5 100644
--- a/arch/x86/kvm/svm.c
+++ b/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)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index bc933cfb4e66..68f895b00450 100644
--- a/arch/x86/kvm/vmx.c
+++ b/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 */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3c4ca98ad27f..274a8e39bca7 100644
--- a/arch/x86/kvm/x86.c
+++ b/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;