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xen: split up xen_hvm_init_shared_info() 

Instead of calling xen_hvm_init_shared_info() on boot and resume split
it up into a boot time function searching for the pfn to use and a
mapping function doing the hypervisor mapping call.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2017-07-28 12:23:13 +02:00
parent c138d81163
commit 10231f69eb
1 changed files with 24 additions and 21 deletions
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23
arch/x86/xen/enlighten_hvm.c
View File

@ -21,12 +21,22 @@
#include "mmu.h"
#include "smp.h"
void __ref xen_hvm_init_shared_info(void)
void xen_hvm_init_shared_info(void)
{
struct xen_add_to_physmap xatp;
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
xatp.gpfn = virt_to_pfn(HYPERVISOR_shared_info);
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
}
static void __init reserve_shared_info(void)
{
u64 pa;
if (HYPERVISOR_shared_info == &xen_dummy_shared_info) {
/*
* Search for a free page starting at 4kB physical address.
* Low memory is preferred to avoid an EPT large page split up
@ -45,14 +55,6 @@ void __ref xen_hvm_init_shared_info(void)
HYPERVISOR_shared_info = __va(pa);
}
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
xatp.gpfn = virt_to_pfn(HYPERVISOR_shared_info);
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
}
static void __init init_hvm_pv_info(void)
{
int major, minor;
@ -153,6 +155,7 @@ static void __init xen_hvm_guest_init(void)
init_hvm_pv_info();
reserve_shared_info();
xen_hvm_init_shared_info();
/*