From: Shannon Zhao <shannon.zhao@xxxxxxxxxx> Check if there is "uefi" node in the DT. If so, set EFI_PARAVIRT flag. Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx> --- arch/arm/xen/enlighten.c | 23 +++++++++++++++++++++++ arch/arm64/kernel/efi.c | 5 +++++ 2 files changed, 28 insertions(+) diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index 5d0fe68..485e117 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -31,6 +31,7 @@ #include <linux/timekeeping.h> #include <linux/timekeeper_internal.h> #include <linux/acpi.h> +#include <linux/efi.h> #include <linux/mm.h> @@ -248,6 +249,19 @@ static int __init fdt_find_xen_node(unsigned long node, const char *uname, return 0; } +static int __init fdt_find_uefi_node(unsigned long node, const char *uname, + int depth, void *data) +{ + bool *found = data; + + if (depth != 2 || strcmp(uname, "uefi") != 0) + return 0; + + *found = true; + + return 1; +} + /* * see Documentation/devicetree/bindings/arm/xen.txt for the * documentation of the Xen Device Tree format. @@ -255,6 +269,8 @@ static int __init fdt_find_xen_node(unsigned long node, const char *uname, #define GRANT_TABLE_PHYSADDR 0 void __init xen_early_init(void) { + bool uefi_found = false; + of_scan_flat_dt(fdt_find_xen_node, NULL); if (!xen_node.found) { pr_debug("No Xen support\n"); @@ -279,6 +295,13 @@ void __init xen_early_init(void) if (!console_set_on_cmdline && !xen_initial_domain()) add_preferred_console("hvc", 0, NULL); + + if (IS_ENABLED(CONFIG_XEN_EFI)) { + /* Check if Xen support UEFI */ + of_scan_flat_dt(fdt_find_uefi_node, &uefi_found); + if (uefi_found) + set_bit(EFI_PARAVIRT, &efi.flags); + } } static int __init xen_guest_init(void) diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c index 4eeb171..16c6b72 100644 --- a/arch/arm64/kernel/efi.c +++ b/arch/arm64/kernel/efi.c @@ -288,6 +288,11 @@ static int __init arm64_enable_runtime_services(void) return 0; } + if (efi_enabled(EFI_PARAVIRT)) { + pr_info("EFI runtime services access via paravirt.\n"); + return -1; + } + pr_info("Remapping and enabling EFI services.\n"); mapsize = memmap.map_end - memmap.map; -- 2.0.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html