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lguest: update comments to reflect LHCALL_LOAD_GDT_ENTRY. 

We used to have a hypercall which reloaded the entire GDT, then we
switched to one which loaded a single entry (to match the IDT code).

Some comments were not updated, so fix them.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reported by: Eviatar Khen <eviatarkhen@gmail.com>
This commit is contained in:
Rusty Russell 2010-09-21 10:54:01 -06:00
parent 65745422a8
commit 9b6efcd2e2
1 changed files with 8 additions and 5 deletions
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13
arch/x86/lguest/boot.c
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@ -324,9 +324,8 @@ 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.
* For a single GDT entry which changes, we simply change our copy and
* then tell the host about it.
*/
static void lguest_write_gdt_entry(struct desc_struct *dt, int entrynum,
const void *desc, int type)
@ -338,9 +337,13 @@ static void lguest_write_gdt_entry(struct desc_struct *dt, int entrynum,
}
/*
* OK, I lied. There are three "thread local storage" GDT entries which change
* There are three "thread local storage" GDT entries which change
* on every context switch (these three entries are how glibc implements
* __thread variables). So we have a hypercall specifically for this case.
* __thread variables). As an optimization, we have a hypercall
* specifically for this case.
*
* Wouldn't it be nicer to have a general LOAD_GDT_ENTRIES hypercall
* which took a range of entries?
*/
static void lguest_load_tls(struct thread_struct *t, unsigned int cpu)
{