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xen: fix UP setup of shared_info

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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.

[ Stable: needed in 2.6.24.x ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stable Kernel <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-03-17 16:36:53 -07:00 committed by Ingo Molnar
parent 04c44a080d
commit 2e8fe719b5
1 changed files with 28 additions and 23 deletions
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51
arch/x86/xen/enlighten.c
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@ -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)
@ -805,6 +806,31 @@ static __init void xen_pagetable_setup_start(pgd_t *base)
PFN_DOWN(__pa(xen_start_info->pt_base)));
}
static __init void setup_shared_info(void)
{
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(addr,
PFN_DOWN(xen_start_info->shared_info),
PAGE_KERNEL);
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
@ -815,22 +841,7 @@ static __init void xen_pagetable_setup_done(pgd_t *base)
pv_mmu_ops.release_pd = xen_release_pt;
pv_mmu_ops.set_pte = xen_set_pte;
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
/*
* 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),
PFN_DOWN(xen_start_info->shared_info),
PAGE_KERNEL);
HYPERVISOR_shared_info =
(struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
} else
HYPERVISOR_shared_info =
(struct shared_info *)__va(xen_start_info->shared_info);
setup_shared_info();
/* Actually pin the pagetable down, but we can't set PG_pinned
yet because the page structures don't exist yet. */
@ -1182,15 +1193,9 @@ 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))