[PATCH 3.4 83/88] xen/setup: Combine the two hypercall functions - since they are quite similar.

Greg Kroah-Hartman
2014-06-10T00:25:33Z

From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

commit 96dc08b35c4af8cb5810450602590706f2593a5f upstream.

They use the same set of arguments, so it is just the matter
of using the proper hypercall.

Acked-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/xen/setup.c | 80 +++++++++++++++++++--------------------------------
1 file changed, 30 insertions(+), 50 deletions(-)

--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -91,8 +91,8 @@ static void __init xen_add_extra_mem(u64
}
}

-static unsigned long __init xen_release_chunk(unsigned long start,
- unsigned long end)
+static unsigned long __init xen_do_chunk(unsigned long start,
+ unsigned long end, bool release)
{
struct xen_memory_reservation reservation = {
.address_bits = 0,
@@ -103,59 +103,36 @@ static unsigned long __init xen_release_
unsigned long pfn;
int ret;

- for(pfn = start; pfn < end; pfn++) {
- unsigned long mfn = pfn_to_mfn(pfn);
-
- /* Make sure pfn exists to start with */
- if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
- continue;
-
- set_xen_guest_handle(reservation.extent_start, &mfn);
- reservation.nr_extents = 1;
-
- ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
- &reservation);
- WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret);
- if (ret == 1) {
- __set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
- len++;
- }
- }
- printk(KERN_INFO "Freeing %lx-%lx pfn range: %lu pages freed\n",
- start, end, len);
-
- return len;
-}
-static unsigned long __init xen_populate_physmap(unsigned long start,
- unsigned long end)
-{
- struct xen_memory_reservation reservation = {
- .address_bits = 0,
- .extent_order = 0,
- .domid = DOMID_SELF
- };
- unsigned long len = 0;
- int ret;
-
for (pfn = start; pfn < end; pfn++) {
unsigned long frame;
+ unsigned long mfn = pfn_to_mfn(pfn);

- /* Make sure pfn does not exists to start with */
- if (pfn_to_mfn(pfn) != INVALID_P2M_ENTRY)
- continue;
-
- frame = pfn;
+ if (release) {
+ /* Make sure pfn exists to start with */
+ if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
+ continue;
+ frame = mfn;
+ } else {
+ if (mfn != INVALID_P2M_ENTRY)
+ continue;
+ frame = pfn;
+ }
set_xen_guest_handle(reservation.extent_start, &frame);
reservation.nr_extents = 1;

- ret = HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
- WARN(ret != 1, "Failed to populate pfn %lx err=%d\n", pfn, ret);
+ ret = HYPERVISOR_memory_op(release ? XENMEM_decrease_reservation : XENMEM_populate_physmap,
+ &reservation);
+ WARN(ret != 1, "Failed to %s pfn %lx err=%d\n",
+ release ? "release" : "populate", pfn, ret);
+
if (ret == 1) {
- if (!early_set_phys_to_machine(pfn, frame)) {
+ if (!early_set_phys_to_machine(pfn, release ? INVALID_P2M_ENTRY : frame)) {
+ if (release)
+ break;
set_xen_guest_handle(reservation.extent_start, &frame);
reservation.nr_extents = 1;
ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
- &reservation);
+ &reservation);
break;
}
len++;
@@ -163,8 +140,11 @@ static unsigned long __init xen_populate
break;
}
if (len)
- printk(KERN_INFO "Populated %lx-%lx pfn range: %lu pages added\n",
- start, end, len);
+ printk(KERN_INFO "%s %lx-%lx pfn range: %lu pages %s\n",
+ release ? "Freeing" : "Populating",
+ start, end, len,
+ release ? "freed" : "added");
+
return len;
}
static unsigned long __init xen_populate_chunk(
@@ -218,7 +198,7 @@ static unsigned long __init xen_populate
if (credits > capacity)
credits = capacity;

- pfns = xen_populate_physmap(dest_pfn, dest_pfn + credits);
+ pfns = xen_do_chunk(dest_pfn, dest_pfn + credits, false);
done += pfns;
credits_left -= pfns;
*last_pfn = (dest_pfn + pfns);
@@ -256,8 +236,8 @@ static unsigned long __init xen_set_iden

if (start_pfn < end_pfn) {
if (start_pfn < nr_pages)
- released += xen_release_chunk(
- start_pfn, min(end_pfn, nr_pages));
+ released += xen_do_chunk(
+ start_pfn, min(end_pfn, nr_pages), true);

identity += set_phys_range_identity(
start_pfn, end_pfn);