lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

xen: Add suspend/resume support for PV on HVM guests.

Browse Source 
Suspend/resume requires few different things on HVM: the suspend
hypercall is different; we don't need to save/restore memory related
settings; except the shared info page and the callback mechanism.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Stefano Stabellini
2010-05-14 12:45:07 +01:00
committed by Jeremy Fitzhardinge
parent 183d03cc4f
commit 016b6f5fe8
6 changed files with 90 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
arch/x86/xen/enlighten.c
View File

@@ -1262,13 +1262,15 @@ static int init_hvm_pv_info(int *major, int *minor)
return 0;
}
static void __init init_shared_info(void)
void xen_hvm_init_shared_info(void)
{
int cpu;
struct xen_add_to_physmap xatp;
struct shared_info *shared_info_page;
static struct shared_info *shared_info_page = 0;
shared_info_page = (struct shared_info *)
extend_brk(PAGE_SIZE, PAGE_SIZE);
if (!shared_info_page)
shared_info_page = (struct shared_info *)
extend_brk(PAGE_SIZE, PAGE_SIZE);
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
@@ -1278,7 +1280,17 @@ static void __init init_shared_info(void)
HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
* page, we use it in the event channel upcall and in some pvclock
* related functions. We don't need the vcpu_info placement
* optimizations because we don't use any pv_mmu or pv_irq op on
* HVM.
* When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
* online but xen_hvm_init_shared_info is run at resume time too and
* in that case multiple vcpus might be online. */
for_each_online_cpu(cpu) {
per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
}
}
static int __cpuinit xen_hvm_cpu_notify(struct notifier_block *self,
@@ -1308,7 +1320,7 @@ static void __init xen_hvm_guest_init(void)
if (r < 0)
return;
init_shared_info();
xen_hvm_init_shared_info();
if (xen_feature(XENFEAT_hvm_callback_vector))
xen_have_vector_callback = 1;