x86: change write_gdt_entry signature.
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>
diff --git a/arch/x86/kernel/paravirt_32.c b/arch/x86/kernel/paravirt_32.c
index 13bbc99..77602c1 100644
--- a/arch/x86/kernel/paravirt_32.c
+++ b/arch/x86/kernel/paravirt_32.c
@@ -380,7 +380,7 @@
.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,
diff --git a/arch/x86/kernel/smpcommon_32.c b/arch/x86/kernel/smpcommon_32.c
index bbfe85a..8bc38af 100644
--- a/arch/x86/kernel/smpcommon_32.c
+++ b/arch/x86/kernel/smpcommon_32.c
@@ -14,10 +14,11 @@
{
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;
diff --git a/arch/x86/kernel/vmi_32.c b/arch/x86/kernel/vmi_32.c
index a635b22..21edd0d 100644
--- a/arch/x86/kernel/vmi_32.c
+++ b/arch/x86/kernel/vmi_32.c
@@ -63,6 +63,7 @@
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 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_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 @@
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 @@
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);
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index b50c8ad..a633737 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -262,10 +262,10 @@
/* 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);
}
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b7b7346..7f98c63 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -475,22 +475,21 @@
/* 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();
}
diff --git a/include/asm-x86/desc_32.h b/include/asm-x86/desc_32.h
index 0370099..41d8214 100644
--- a/include/asm-x86/desc_32.h
+++ b/include/asm-x86/desc_32.h
@@ -28,12 +28,13 @@
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 @@
#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 @@
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 @@
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_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);
}
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
index 86a9d7b..3f2abf2 100644
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -99,7 +99,7 @@
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 @@
{
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);