| Message ID | 1452840929-19612-14-git-send-email-zhaoshenglong@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Jan 15, 2016 at 02:55:26PM +0800, Shannon Zhao wrote: > From: Shannon Zhao <shannon.zhao@linaro.org> > > Check if there is "uefi" node in the DT. If so, set EFI_PARAVIRT flag. > > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> > --- > 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; > +} I don't like this. What if we had to add a uefi node in the !Xen case for some reason? You want to look for /hypervisor/uefi, specifically when the hypervisor compatible contains "xen,xen". It would be better to find the "/hypervisor" node, checking for the compatible string, then walk within that in the Xen-specific init routine. > + > /* > * 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); > + } > } This alone is insufficient given that we haven't parsed the rest of the /hypervisor/uefi properties. Is the kernel resilient such that this patch alone will not result in a panic? I think it would be best for this to be in the same patch as the rest of the hypervisor UEFI property parsing, being unified with that. Mark. > 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@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
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;