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authorMaran Wilson <maran.wilson@oracle.com>2018-12-10 11:08:46 -0800
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2018-12-13 13:41:49 -0500
commita43fb7da53007e67ad593e179f01a1925b04f586 (patch)
tree75e7796e7c70cddb2a150cfd627dad8c3e6b5723 /arch/x86/xen
parent8cee3974b35bfb235d4637e10de5c5b364a9057e (diff)
downloadlinux-a43fb7da53007e67ad593e179f01a1925b04f586.tar.bz2
xen/pvh: Move Xen code for getting mem map via hcall out of common file
We need to refactor PVH entry code so that support for other hypervisors like Qemu/KVM can be added more easily. The original design for PVH entry in Xen guests relies on being able to obtain the memory map from the hypervisor using a hypercall. When we extend the PVH entry ABI to support other hypervisors like Qemu/KVM, a new mechanism will be added that allows the guest to get the memory map without needing to use hypercalls. For Xen guests, the hypercall approach will still be supported. In preparation for adding support for other hypervisors, we can move the code that uses hypercalls into the Xen specific file. This will allow us to compile kernels in the future without CONFIG_XEN that are still capable of being booted as a Qemu/KVM guest via the PVH entry point. Signed-off-by: Maran Wilson <maran.wilson@oracle.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'arch/x86/xen')
-rw-r--r--arch/x86/xen/enlighten_pvh.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c
index 41a7d6ad74e0..35b7599d2d0b 100644
--- a/arch/x86/xen/enlighten_pvh.c
+++ b/arch/x86/xen/enlighten_pvh.c
@@ -1,13 +1,18 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/acpi.h>
+#include <xen/hvc-console.h>
+
#include <asm/io_apic.h>
#include <asm/hypervisor.h>
+#include <asm/e820/api.h>
#include <xen/xen.h>
#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>
+#include <xen/interface/memory.h>
+
/*
* PVH variables.
*
@@ -28,3 +33,18 @@ void __init xen_pvh_init(void)
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
}
+
+void __init mem_map_via_hcall(struct boot_params *boot_params_p)
+{
+ struct xen_memory_map memmap;
+ int rc;
+
+ memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
+ set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
+ rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
+ if (rc) {
+ xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
+ BUG();
+ }
+ boot_params_p->e820_entries = memmap.nr_entries;
+}