commit bcd817a3949cfc772b97f3f1428be35488e6266b
Author: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
Date: Thu Mar 27 20:35:05 2008 +0000
xen: fix UP setup of shared_info
upstream commit: 2e8fe719b57bbdc9e313daed1204bb55fed3ed44
We need to set up the shared_info pointer once we've mapped the real
shared_info into its fixmap slot. That needs to happen once the general
pagetable setup has been done. Previously, the UP shared_info was set
up one in xen_start_kernel, but that was left pointing to the dummy
shared info. Unfortunately there's no really good place to do a later
setup of the shared_info in UP, so just do it once the pagetable setup
has been done.
Signed-off-by: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
[EMAIL PROTECTED]: backport to 2.6.24.4]
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 228f6c7..f177f86 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -103,6 +103,7 @@ static void __init xen_vcpu_setup(int cpu)
int err;
struct vcpu_info *vcpup;
+ BUG_ON(HYPERVISOR_shared_info == &dummy_shared_info);
per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
if (!have_vcpu_info_placement)
@@ -792,30 +793,40 @@ static __init void xen_pagetable_setup_start(pgd_t *base)
xen_write_cr3(__pa(base));
}
-static __init void xen_pagetable_setup_done(pgd_t *base)
+static __init void setup_shared_info(void)
{
- /* This will work as long as patching hasn't happened yet
- (which it hasn't) */
- pv_mmu_ops.alloc_pt = xen_alloc_pt;
- pv_mmu_ops.set_pte = xen_set_pte;
-
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+ unsigned long addr = fix_to_virt(FIX_PARAVIRT_BOOTMAP);
+
/*
* Create a mapping for the shared info page.
* Should be set_fixmap(), but shared_info is a machine
* address with no corresponding pseudo-phys address.
*/
- set_pte_mfn(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
+ set_pte_mfn(addr,
PFN_DOWN(xen_start_info->shared_info),
PAGE_KERNEL);
- HYPERVISOR_shared_info =
- (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
-
+ HYPERVISOR_shared_info = (struct shared_info *)addr;
} else
HYPERVISOR_shared_info =
(struct shared_info *)__va(xen_start_info->shared_info);
+#ifndef CONFIG_SMP
+ /* In UP this is as good a place as any to set up shared info */
+ xen_setup_vcpu_info_placement();
+#endif
+}
+
+static __init void xen_pagetable_setup_done(pgd_t *base)
+{
+ /* This will work as long as patching hasn't happened yet
+ (which it hasn't) */
+ pv_mmu_ops.alloc_pt = xen_alloc_pt;
+ pv_mmu_ops.set_pte = xen_set_pte;
+
+ setup_shared_info();
+
/* Actually pin the pagetable down, but we can't set PG_pinned
yet because the page structures don't exist yet. */
{
@@ -1166,15 +1177,9 @@ asmlinkage void __init xen_start_kernel(void)
x86_write_percpu(xen_cr3, __pa(pgd));
x86_write_percpu(xen_current_cr3, __pa(pgd));
-#ifdef CONFIG_SMP
/* Don't do the full vcpu_info placement stuff until we have a
- possible map. */
+ possible map and a non-dummy shared_info. */
per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
-#else
- /* May as well do it now, since there's no good time to call
- it later on UP. */
- xen_setup_vcpu_info_placement();
-#endif
pv_info.kernel_rpl = 1;
if (xen_feature(XENFEAT_supervisor_mode_kernel))
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