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x86/efi: Split efi_enter_virtual_mode 

... into a kexec flavor for better code readability and simplicity. The
original one was getting ugly with ifdeffery.

Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Borislav Petkov 2014-01-18 12:48:18 +01:00 committed by Matt Fleming
parent b7b898ae0c
commit fabb37c736
1 changed files with 98 additions and 50 deletions
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148
arch/x86/platform/efi/efi.c
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@ -879,8 +879,9 @@ static void __init get_systab_virt_addr(efi_memory_desc_t *md)
}
}
static int __init save_runtime_map(void)
static void __init save_runtime_map(void)
{
#ifdef CONFIG_KEXEC
efi_memory_desc_t *md;
void *tmp, *p, *q = NULL;
int count = 0;
@ -902,28 +903,12 @@ static int __init save_runtime_map(void)
}
efi_runtime_map_setup(q, count, memmap.desc_size);
return;
return 0;
out:
kfree(q);
return -ENOMEM;
}
/*
* Map efi regions which were passed via setup_data. The virt_addr is a fixed
* addr which was used in first kernel of a kexec boot.
*/
static void __init efi_map_regions_fixed(void)
{
void *p;
efi_memory_desc_t *md;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
efi_map_region_fixed(md); /* FIXME: add error handling */
get_systab_virt_addr(md);
}
pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
#endif
}
static void *realloc_pages(void *old_memmap, int old_shift)
@ -989,6 +974,72 @@ static void * __init efi_map_regions(int *count, int *pg_shift)
return new_memmap;
}
static void __init kexec_enter_virtual_mode(void)
{
#ifdef CONFIG_KEXEC
efi_memory_desc_t *md;
void *p;
efi.systab = NULL;
/*
* We don't do virtual mode, since we don't do runtime services, on
* non-native EFI
*/
if (!efi_is_native()) {
efi_unmap_memmap();
return;
}
/*
* Map efi regions which were passed via setup_data. The virt_addr is a
* fixed addr which was used in first kernel of a kexec boot.
*/
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
efi_map_region_fixed(md); /* FIXME: add error handling */
get_systab_virt_addr(md);
}
save_runtime_map();
BUG_ON(!efi.systab);
efi_sync_low_kernel_mappings();
/*
* Now that EFI is in virtual mode, update the function
* pointers in the runtime service table to the new virtual addresses.
*
* Call EFI services through wrapper functions.
*/
efi.runtime_version = efi_systab.hdr.revision;
efi.get_time = virt_efi_get_time;
efi.set_time = virt_efi_set_time;
efi.get_wakeup_time = virt_efi_get_wakeup_time;
efi.set_wakeup_time = virt_efi_set_wakeup_time;
efi.get_variable = virt_efi_get_variable;
efi.get_next_variable = virt_efi_get_next_variable;
efi.set_variable = virt_efi_set_variable;
efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
efi.reset_system = virt_efi_reset_system;
efi.set_virtual_address_map = NULL;
efi.query_variable_info = virt_efi_query_variable_info;
efi.update_capsule = virt_efi_update_capsule;
efi.query_capsule_caps = virt_efi_query_capsule_caps;
if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
runtime_code_page_mkexec();
/* clean DUMMY object */
efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
0, NULL);
#endif
}
/*
* This function will switch the EFI runtime services to virtual mode.
* Essentially, we look through the EFI memmap and map every region that
@ -1008,11 +1059,12 @@ static void * __init efi_map_regions(int *count, int *pg_shift)
*
* Specially for kexec boot, efi runtime maps in previous kernel should
* be passed in via setup_data. In that case runtime ranges will be mapped
* to the same virtual addresses as the first kernel.
* to the same virtual addresses as the first kernel, see
* kexec_enter_virtual_mode().
*/
void __init efi_enter_virtual_mode(void)
static void __init __efi_enter_virtual_mode(void)
{
int err, count = 0, pg_shift = 0;
int count = 0, pg_shift = 0;
void *new_memmap = NULL;
efi_status_t status;
@ -1027,43 +1079,33 @@ void __init efi_enter_virtual_mode(void)
return;
}
if (efi_setup) {
efi_map_regions_fixed();
} else {
efi_merge_regions();
new_memmap = efi_map_regions(&count, &pg_shift);
if (!new_memmap) {
pr_err("Error reallocating memory, EFI runtime non-functional!\n");
return;
}
err = save_runtime_map();
if (err)
pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
efi_merge_regions();
new_memmap = efi_map_regions(&count, &pg_shift);
if (!new_memmap) {
pr_err("Error reallocating memory, EFI runtime non-functional!\n");
return;
}
save_runtime_map();
BUG_ON(!efi.systab);
if (!efi_setup) {
if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift))
return;
}
if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift))
return;
efi_sync_low_kernel_mappings();
efi_dump_pagetable();
if (!efi_setup) {
status = phys_efi_set_virtual_address_map(
status = phys_efi_set_virtual_address_map(
memmap.desc_size * count,
memmap.desc_size,
memmap.desc_version,
(efi_memory_desc_t *)__pa(new_memmap));
if (status != EFI_SUCCESS) {
pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
status);
panic("EFI call to SetVirtualAddressMap() failed!");
}
if (status != EFI_SUCCESS) {
pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
status);
panic("EFI call to SetVirtualAddressMap() failed!");
}
/*
@ -1089,7 +1131,6 @@ void __init efi_enter_virtual_mode(void)
efi_runtime_mkexec();
/*
* We mapped the descriptor array into the EFI pagetable above but we're
* not unmapping it here. Here's why:
@ -1116,8 +1157,7 @@ void __init efi_enter_virtual_mode(void)
*
* efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift);
*/
if (!efi_setup)
free_pages((unsigned long)new_memmap, pg_shift);
free_pages((unsigned long)new_memmap, pg_shift);
/* clean DUMMY object */
efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
@ -1127,6 +1167,14 @@ void __init efi_enter_virtual_mode(void)
0, NULL);
}
void __init efi_enter_virtual_mode(void)
{
if (efi_setup)
kexec_enter_virtual_mode();
else
__efi_enter_virtual_mode();
}
/*
* Convenience functions to obtain memory types and attributes
*/