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authorDaniel Kiper <daniel.kiper@oracle.com>2014-06-30 21:53:02 +0400
committerMatt Fleming <matt.fleming@intel.com>2014-07-19 00:23:58 +0400
commitbe81c8a1da24288b0231be50130a64f5cdffdcd4 (patch)
treeb0e011366af28808fffc44e8de8ca690dd645ad0 /include/xen
parentbf1e3ae468aca7ce34110a59ed5d1b877890014b (diff)
downloadlinux-be81c8a1da24288b0231be50130a64f5cdffdcd4.tar.xz
xen: Put EFI machinery in place
This patch enables EFI usage under Xen dom0. Standard EFI Linux Kernel infrastructure cannot be used because it requires direct access to EFI data and code. However, in dom0 case it is not possible because above mentioned EFI stuff is fully owned and controlled by Xen hypervisor. In this case all calls from dom0 to EFI must be requested via special hypercall which in turn executes relevant EFI code in behalf of dom0. When dom0 kernel boots it checks for EFI availability on a machine. If it is detected then artificial EFI system table is filled. Native EFI callas are replaced by functions which mimics them by calling relevant hypercall. Later pointer to EFI system table is passed to standard EFI machinery and it continues EFI subsystem initialization taking into account that there is no direct access to EFI boot services, runtime, tables, structures, etc. After that system runs as usual. This patch is based on Jan Beulich and Tang Liang work. Signed-off-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Tang Liang <liang.tang@oracle.com> Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/xen-ops.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 0b3149ed7eaa..771bbba27ccb 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -3,6 +3,7 @@
#include <linux/percpu.h>
#include <linux/notifier.h>
+#include <linux/efi.h>
#include <asm/xen/interface.h>
DECLARE_PER_CPU(struct vcpu_info *, xen_vcpu);
@@ -35,4 +36,14 @@ int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
int numpgs, struct page **pages);
bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
+
+#ifdef CONFIG_XEN_EFI
+extern efi_system_table_t *xen_efi_probe(void);
+#else
+static efi_system_table_t __init *xen_efi_probe(void)
+{
+ return NULL;
+}
+#endif
+
#endif /* INCLUDE_XEN_OPS_H */