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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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45
arch/x86/xen/enlighten_hvm.c
View File

@ -21,29 +21,9 @@
#include "mmu.h" #include "mmu.h"
#include "smp.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; struct xen_add_to_physmap xatp;
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
* by the mapping.
* Starting below X86_RESERVE_LOW (usually 64kB) is fine as
* the BIOS used for HVM guests is well behaved and won't
* clobber memory other than the first 4kB.
*/
for (pa = PAGE_SIZE;
!e820__mapped_all(pa, pa + PAGE_SIZE, E820_TYPE_RAM) ||
memblock_is_reserved(pa);
pa += PAGE_SIZE)
;
memblock_reserve(pa, PAGE_SIZE);
HYPERVISOR_shared_info = __va(pa);
}
xatp.domid = DOMID_SELF; xatp.domid = DOMID_SELF;
xatp.idx = 0; xatp.idx = 0;
@ -53,6 +33,28 @@ void __ref xen_hvm_init_shared_info(void)
BUG(); BUG();
} }
static void __init reserve_shared_info(void)
{
u64 pa;
/*
* Search for a free page starting at 4kB physical address.
* Low memory is preferred to avoid an EPT large page split up
* by the mapping.
* Starting below X86_RESERVE_LOW (usually 64kB) is fine as
* the BIOS used for HVM guests is well behaved and won't
* clobber memory other than the first 4kB.
*/
for (pa = PAGE_SIZE;
!e820__mapped_all(pa, pa + PAGE_SIZE, E820_TYPE_RAM) ||
memblock_is_reserved(pa);
pa += PAGE_SIZE)
;
memblock_reserve(pa, PAGE_SIZE);
HYPERVISOR_shared_info = __va(pa);
}
static void __init init_hvm_pv_info(void) static void __init init_hvm_pv_info(void)
{ {
int major, minor; int major, minor;
@ -153,6 +155,7 @@ static void __init xen_hvm_guest_init(void)
init_hvm_pv_info(); init_hvm_pv_info();
reserve_shared_info();
xen_hvm_init_shared_info(); xen_hvm_init_shared_info();
/* /*