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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-03-04 15:26:00 -0800
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-04-08 11:51:45 -0700
commita957fac50023eac09368ab19d3a7ec725c2657c3 (patch)
tree89ea5e4caa1f849ce4618907bcdb11958e7651f5 /arch/x86/xen
parentc7da8c829b3f919089ff021d6ddc376d38299729 (diff)
xen: make xen_load_gdt simpler
Remove use of multicall machinery which is unused (gdt loading is never performance critical). This removes the implicit use of percpu variables, which simplifies understanding how the percpu code's use of load_gdt interacts with this code. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86/xen')
-rw-r--r--arch/x86/xen/enlighten.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 8e024554a3e..334d2ffc4e2 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -284,12 +284,11 @@ static void xen_set_ldt(const void *addr, unsigned entries)
static void xen_load_gdt(const struct desc_ptr *dtr)
{
- unsigned long *frames;
unsigned long va = dtr->address;
unsigned int size = dtr->size + 1;
unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
+ unsigned long frames[pages];
int f;
- struct multicall_space mcs;
/* A GDT can be up to 64k in size, which corresponds to 8192
8-byte entries, or 16 4k pages.. */
@@ -297,9 +296,6 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
BUG_ON(size > 65536);
BUG_ON(va & ~PAGE_MASK);
- mcs = xen_mc_entry(sizeof(*frames) * pages);
- frames = mcs.args;
-
for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
int level;
pte_t *ptep = lookup_address(va, &level);
@@ -314,13 +310,15 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
frames[f] = mfn;
+ printk("xen_load_gdt: %d va=%p mfn=%lx pfn=%lx va'=%p\n",
+ f, (void *)va, mfn, pfn, virt);
+
make_lowmem_page_readonly((void *)va);
make_lowmem_page_readonly(virt);
}
- MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct));
-
- xen_mc_issue(PARAVIRT_LAZY_CPU);
+ if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
+ BUG();
}
static void load_TLS_descriptor(struct thread_struct *t,