On Mon, 09 Dec, at 05:42:22PM, Dave Young wrote:
> Add a new setup_data type SETUP_EFI for kexec use.
> Passing the saved fw_vendor, runtime, config tables and efi runtime mappings.
>
> When entering virtual mode, directly mapping the efi runtime ragions which
> we passed in previously. And skip the step to call SetVirtualAddressMap.
>
> Specially for HP z420 workstation we need save the smbios physical address.
> The kernel boot sequence proceeds in the following order. Step 2
> requires efi.smbios to be the physical address. However, I found that on
> HP z420 EFI system table has a virtual address of SMBIOS in step 1. Hence,
> we need set it back to the physical address with the smbios in
> efi_setup_data. (When it is still the physical address, it simply sets
> the same value.)
>
> 1. efi_init() - Set efi.smbios from EFI system table
> 2. dmi_scan_machine() - Temporary map efi.smbios to access SMBIOS table
> 3. efi_enter_virtual_mode() - Map EFI ranges
>
> Tested on ovmf+qemu, lenovo thinkpad, a dell laptop and an
> HP z420 workstation.
>
> v2: refresh based on previous patch changes, code cleanup.
> v3: use ioremap instead of phys_to_virt for efi_setup
> v5: improve some code structure per comments from Matt
> Boris: improve code structure, spell fix, etc.
> Improve changelog from Toshi.
> change the variable efi_setup to the physical address of efi setup_data
> instead of the ioremapped virt address
>
> Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
> ---
> arch/x86/include/asm/efi.h | 11 ++
> arch/x86/include/uapi/asm/bootparam.h | 1 +
> arch/x86/kernel/setup.c | 3 +
> arch/x86/platform/efi/efi.c | 195 ++++++++++++++++++++++++++++++----
> 4 files changed, 187 insertions(+), 23 deletions(-)
[...]
> @@ -115,6 +116,25 @@ static int __init setup_storage_paranoia(char *arg)
> }
> early_param("efi_no_storage_paranoia", setup_storage_paranoia);
>
> +void __init parse_efi_setup(u64 phys_addr)
> +{
> + struct setup_data *sd;
> +
> + if (!efi_enabled(EFI_64BIT)) {
> + pr_warn("SETUP_EFI not supported on 32-bit\n");
> + return;
> + }
> +
> + sd = early_memremap(phys_addr, sizeof(struct setup_data));
> + if (!sd) {
> + pr_warn("efi: early_memremap setup_data failed\n");
You shouldn't need the "efi:" prefix in the message.
> @@ -676,6 +766,8 @@ void __init efi_init(void)
> efi.systab->hdr.revision >> 16,
> efi.systab->hdr.revision & 0xffff, vendor);
>
> + efi_reuse_config(efi.systab->tables, efi.systab->nr_tables);
> +
Please check the return value.
> if (efi_config_init(arch_tables))
> return;
>
> @@ -886,6 +978,50 @@ out_krealloc:
> }
>
> /*
> + * Map efi regions which was passed via setup_data. The virt_addr is a fixed
> + * addr which was used in first kernel in case kexec boot.
> + */
> +static int __init map_regions_fixed(void)
> +{
> + int i, s, ret = 0;
> + u64 end, systab;
> + unsigned long size;
> + efi_memory_desc_t *md;
> + struct efi_setup_data *data;
> +
> + s = sizeof(*data) + nr_efi_runtime_map * sizeof(data->map[0]);
> + data = early_memremap(efi_setup, s);
> + if (!data) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + for (i = 0, md = data->map; i < nr_efi_runtime_map; i++, md++) {
> + efi_map_region_fixed(md); /* FIXME: add error handling */
Oops. Please fix this ;-)
--
Matt Fleming, Intel Open Source Technology Center
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