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x86: change write_gdt_entry signature.

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This patch changes the write_gdt_entry function signature.
Instead of the old "a" and "b" parameters, it now receives
a pointer to a desc_struct, and the size of the entry being
handled. This is because x86_64 can have some 16-byte entries
as well as 8-byte ones.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
CC: Zachary Amsden <zach@vmware.com>
CC: Jeremy Fitzhardinge <Jeremy.Fitzhardinge.citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber de Oliveira Costa 2008-01-30 13:31:13 +01:00 committed by Ingo Molnar
parent 18245d5b6e
commit 014b15be30
7 changed files with 56 additions and 34 deletions
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2
arch/x86/kernel/paravirt_32.c
View File

@ -380,7 +380,7 @@ struct pv_cpu_ops pv_cpu_ops = {
.store_tr = native_store_tr,
.load_tls = native_load_tls,
.write_ldt_entry = write_dt_entry,
.write_gdt_entry = write_dt_entry,
.write_gdt_entry = native_write_gdt_entry,
.write_idt_entry = native_write_idt_entry,
.load_sp0 = native_load_sp0,

7
arch/x86/kernel/smpcommon_32.c
View File

@ -14,10 +14,11 @@ __cpuinit void init_gdt(int cpu)
{
struct desc_struct *gdt = get_cpu_gdt_table(cpu);
pack_descriptor((u32 *)&gdt[GDT_ENTRY_PERCPU].a,
(u32 *)&gdt[GDT_ENTRY_PERCPU].b,
pack_descriptor(&gdt[GDT_ENTRY_PERCPU],
__per_cpu_offset[cpu], 0xFFFFF,
0x80 | DESCTYPE_S | 0x2, 0x8);
0x2 | DESCTYPE_S, 0x8);
gdt[GDT_ENTRY_PERCPU].s = 1;
per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
per_cpu(cpu_number, cpu) = cpu;

21
arch/x86/kernel/vmi_32.c
View File

@ -63,6 +63,7 @@ static struct {
void (*_set_ldt)(u32 selector);
void (*set_tr)(u32 selector);
void (*write_idt_entry)(struct desc_struct *, int, u32, u32);
void (*write_gdt_entry)(struct desc_struct *, int, u32, u32);
void (*set_kernel_stack)(u32 selector, u32 sp0);
void (*allocate_page)(u32, u32, u32, u32, u32);
void (*release_page)(u32, u32);
@ -187,7 +188,7 @@ static void vmi_cpuid(unsigned int *ax, unsigned int *bx,
static inline void vmi_maybe_load_tls(struct desc_struct *gdt, int nr, struct desc_struct *new)
{
if (gdt[nr].a != new->a || gdt[nr].b != new->b)
write_gdt_entry(gdt, nr, new->a, new->b);
write_gdt_entry(gdt, nr, new, 0);
}
static void vmi_load_tls(struct thread_struct *t, unsigned int cpu)
@ -201,12 +202,12 @@ static void vmi_load_tls(struct thread_struct *t, unsigned int cpu)
static void vmi_set_ldt(const void *addr, unsigned entries)
{
unsigned cpu = smp_processor_id();
u32 low, high;
struct desc_struct desc;
pack_descriptor(&low, &high, (unsigned long)addr,
pack_descriptor(&desc, (unsigned long)addr,
entries * sizeof(struct desc_struct) - 1,
DESCTYPE_LDT, 0);
write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, low, high);
DESC_LDT, 0);
write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, &desc, DESC_LDT);
vmi_ops._set_ldt(entries ? GDT_ENTRY_LDT*sizeof(struct desc_struct) : 0);
}
@ -221,6 +222,13 @@ static void vmi_write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
vmi_ops.write_idt_entry(dt, entry, idt_entry[0], idt_entry[2]);
}
static void vmi_write_gdt_entry(struct desc_struct *dt, int entry,
const void *desc, int type)
{
u32 *gdt_entry = (u32 *)desc;
vmi_ops.write_gdt_entry(dt, entry, gdt_entry[0], gdt_entry[2]);
}
static void vmi_load_sp0(struct tss_struct *tss,
struct thread_struct *thread)
{
@ -798,7 +806,8 @@ static inline int __init activate_vmi(void)
para_fill(pv_cpu_ops.store_tr, GetTR);
pv_cpu_ops.load_tls = vmi_load_tls;
para_fill(pv_cpu_ops.write_ldt_entry, WriteLDTEntry);
para_fill(pv_cpu_ops.write_gdt_entry, WriteGDTEntry);
para_wrap(pv_cpu_ops.write_gdt_entry, vmi_write_gdt_entry,
write_gdt_entry, WriteGDTEntry);
para_wrap(pv_cpu_ops.write_idt_entry, vmi_write_idt_entry,
write_idt_entry, WriteIDTEntry);
para_wrap(pv_cpu_ops.load_sp0, vmi_load_sp0, set_kernel_stack, UpdateKernelStack);

6
arch/x86/lguest/boot.c
View File

@ -262,10 +262,10 @@ static void lguest_load_gdt(const struct desc_ptr *desc)
/* For a single GDT entry which changes, we do the lazy thing: alter our GDT,
* then tell the Host to reload the entire thing. This operation is so rare
* that this naive implementation is reasonable. */
static void lguest_write_gdt_entry(struct desc_struct *dt,
int entrynum, u32 low, u32 high)
static void lguest_write_gdt_entry(struct desc_struct *dt, int entrynum,
const void *desc, int type)
{
write_dt_entry(dt, entrynum, low, high);
native_write_gdt_entry(dt, entrynum, desc, type);
hcall(LHCALL_LOAD_GDT, __pa(dt), GDT_ENTRIES, 0);
}

11
arch/x86/xen/enlighten.c
View File

@ -475,22 +475,21 @@ static void xen_load_idt(const struct desc_ptr *desc)
/* Write a GDT descriptor entry. Ignore LDT descriptors, since
they're handled differently. */
static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
u32 low, u32 high)
const void *desc, int type)
{
preempt_disable();
switch ((high >> 8) & 0xff) {
case DESCTYPE_LDT:
case DESCTYPE_TSS:
switch (type) {
case DESC_LDT:
case DESC_TSS:
/* ignore */
break;
default: {
xmaddr_t maddr = virt_to_machine(&dt[entry]);
u64 desc = (u64)high << 32 | low;
xen_mc_flush();
if (HYPERVISOR_update_descriptor(maddr.maddr, desc))
if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
BUG();
}

34
include/asm-x86/desc_32.h
View File

@ -28,12 +28,13 @@ extern struct desc_ptr idt_descr;
extern gate_desc idt_table[];
extern void set_intr_gate(unsigned int irq, void * addr);
static inline void pack_descriptor(__u32 *a, __u32 *b,
static inline void pack_descriptor(struct desc_struct *desc,
unsigned long base, unsigned long limit, unsigned char type, unsigned char flags)
{
*a = ((base & 0xffff) << 16) | (limit & 0xffff);
*b = (base & 0xff000000) | ((base & 0xff0000) >> 16) |
desc->a = ((base & 0xffff) << 16) | (limit & 0xffff);
desc->b = (base & 0xff000000) | ((base & 0xff0000) >> 16) |
(limit & 0x000f0000) | ((type & 0xff) << 8) | ((flags & 0xf) << 20);
desc->p = 1;
}
static inline void pack_gate(gate_desc *gate,
@ -69,7 +70,8 @@ static inline void pack_gate(gate_desc *gate,
#define set_ldt native_set_ldt
#define write_ldt_entry(dt, entry, a, b) write_dt_entry(dt, entry, a, b)
#define write_gdt_entry(dt, entry, a, b) write_dt_entry(dt, entry, a, b)
#define write_gdt_entry(dt, entry, desc, type) \
native_write_gdt_entry(dt, entry, desc, type)
#define write_idt_entry(dt, entry, g) native_write_idt_entry(dt, entry, g)
#endif
@ -79,6 +81,12 @@ static inline void native_write_idt_entry(gate_desc *idt, int entry,
memcpy(&idt[entry], gate, sizeof(*gate));
}
static inline void native_write_gdt_entry(struct desc_struct *gdt, int entry,
const void *desc, int type)
{
memcpy(&gdt[entry], desc, sizeof(struct desc_struct));
}
static inline void write_dt_entry(struct desc_struct *dt,
int entry, u32 entry_low, u32 entry_high)
{
@ -86,18 +94,20 @@ static inline void write_dt_entry(struct desc_struct *dt,
dt[entry].b = entry_high;
}
static inline void native_set_ldt(const void *addr, unsigned int entries)
{
if (likely(entries == 0))
__asm__ __volatile__("lldt %w0"::"q" (0));
else {
unsigned cpu = smp_processor_id();
__u32 a, b;
ldt_desc ldt;
pack_descriptor(&a, &b, (unsigned long)addr,
pack_descriptor(&ldt, (unsigned long)addr,
entries * sizeof(struct desc_struct) - 1,
DESCTYPE_LDT, 0);
write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, a, b);
DESC_LDT, 0);
write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT,
&ldt, DESC_LDT);
__asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
}
}
@ -153,11 +163,11 @@ static inline void _set_gate(int gate, unsigned int type, void *addr, unsigned s
static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, const void *addr)
{
__u32 a, b;
pack_descriptor(&a, &b, (unsigned long)addr,
tss_desc tss;
pack_descriptor(&tss, (unsigned long)addr,
offsetof(struct tss_struct, __cacheline_filler) - 1,
DESCTYPE_TSS, 0);
write_gdt_entry(get_cpu_gdt_table(cpu), entry, a, b);
DESC_TSS, 0);
write_gdt_entry(get_cpu_gdt_table(cpu), entry, &tss, DESC_TSS);
}

9
include/asm-x86/paravirt.h
View File

@ -99,7 +99,7 @@ struct pv_cpu_ops {
void (*write_ldt_entry)(struct desc_struct *,
int entrynum, u32 low, u32 high);
void (*write_gdt_entry)(struct desc_struct *,
int entrynum, u32 low, u32 high);
int entrynum, const void *desc, int size);
void (*write_idt_entry)(gate_desc *,
int entrynum, const gate_desc *gate);
void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
@ -664,10 +664,13 @@ static inline void write_ldt_entry(void *dt, int entry, u32 low, u32 high)
{
PVOP_VCALL4(pv_cpu_ops.write_ldt_entry, dt, entry, low, high);
}
static inline void write_gdt_entry(void *dt, int entry, u32 low, u32 high)
static inline void write_gdt_entry(struct desc_struct *dt, int entry,
void *desc, int type)
{
PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, low, high);
PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
}
static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
{
PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);