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xen: make sure xen_max_p2m_pfn is up to date

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Keep xen_max_p2m_pfn up to date with the end of the extra memory
we're adding.  It is possible that it will be too high since memory
may be truncated by a "mem=" option on the kernel command line, but
that won't matter.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge 2010-09-15 13:32:49 -07:00
parent 698bb8d14a
commit 2f7acb2085
3 changed files with 7 additions and 4 deletions
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8
arch/x86/xen/mmu.c
View File

@ -195,7 +195,7 @@ DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
* 512 and 1024 entries respectively.
*/
static unsigned long max_p2m_pfn __read_mostly;
unsigned long xen_max_p2m_pfn __read_mostly;
#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
#define P2M_MID_PER_PAGE (PAGE_SIZE / sizeof(unsigned long *))
@ -293,7 +293,7 @@ void xen_build_mfn_list_list(void)
p2m_top_mfn_init(p2m_top_mfn);
}
for (pfn = 0; pfn < max_p2m_pfn; pfn += P2M_PER_PAGE) {
for (pfn = 0; pfn < xen_max_p2m_pfn; pfn += P2M_PER_PAGE) {
unsigned topidx = p2m_top_index(pfn);
unsigned mididx = p2m_mid_index(pfn);
unsigned long **mid;
@ -335,7 +335,7 @@ void xen_setup_mfn_list_list(void)
HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
virt_to_mfn(p2m_top_mfn);
HYPERVISOR_shared_info->arch.max_pfn = max_p2m_pfn;
HYPERVISOR_shared_info->arch.max_pfn = xen_max_p2m_pfn;
}
/* Set up p2m_top to point to the domain-builder provided p2m pages */
@ -345,7 +345,7 @@ void __init xen_build_dynamic_phys_to_machine(void)
unsigned long max_pfn = min(MAX_DOMAIN_PAGES, xen_start_info->nr_pages);
unsigned pfn;
max_p2m_pfn = max_pfn;
xen_max_p2m_pfn = max_pfn;
p2m_missing = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_init(p2m_missing);

2
arch/x86/xen/setup.c
View File

@ -64,6 +64,8 @@ static __init void xen_add_extra_mem(unsigned long pages)
"XEN EXTRA");
xen_extra_mem_size += size;
xen_max_p2m_pfn = PFN_DOWN(xen_extra_mem_start + xen_extra_mem_size);
}
static unsigned long __init xen_release_chunk(phys_addr_t start_addr,

1
arch/x86/xen/xen-ops.h
View File

@ -30,6 +30,7 @@ void xen_setup_machphys_mapping(void);
pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn);
void xen_ident_map_ISA(void);
void xen_reserve_top(void);
extern unsigned long xen_max_p2m_pfn;
char * __init xen_memory_setup(void);
void __init xen_arch_setup(void);