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x86/paravirt/xen: properly fill out the ldt ops

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LTP testing showed that Xen does not properly implement
sys_modify_ldt().  This patch does the final little bits needed to
make the ldt work properly.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge
2008-07-23 14:21:18 -07:00
committed by Ingo Molnar
parent 338b9bb3ad
commit 38ffbe66d5
5 changed files with 57 additions and 2 deletions
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10
include/asm-x86/desc.h
View File

@@ -97,7 +97,15 @@ static inline int desc_empty(const void *ptr)
native_write_gdt_entry(dt, entry, desc, type)
#define write_idt_entry(dt, entry, g) \
native_write_idt_entry(dt, entry, g)
#endif
static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
{
}
static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
{
}
#endif /* CONFIG_PARAVIRT */
static inline void native_write_idt_entry(gate_desc *idt, int entry,
const gate_desc *gate)

13
include/asm-x86/paravirt.h
View File

@@ -124,6 +124,9 @@ struct pv_cpu_ops {
int entrynum, const void *desc, int size);
void (*write_idt_entry)(gate_desc *,
int entrynum, const gate_desc *gate);
void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
void (*set_iopl_mask)(unsigned mask);
@@ -824,6 +827,16 @@ do { \
(aux) = __aux; \
} while (0)
static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
{
PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
}
static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
{
PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
}
static inline void load_TR_desc(void)
{
PVOP_VCALL0(pv_cpu_ops.load_tr_desc);