Hello.
On 11/14/2014 4:22 AM, Geoff Levand wrote:
> Add runtime checks that fail the arm64 kexec syscall for situations that would
> result in system instability do to problems in the KVM and EFI kernel support.
> These checks should be removed when the KVM and EFI problems are fixed.
> Signed-off-by: Geoff Levand <geoff at infradead.org>
> ---
> arch/arm64/kernel/machine_kexec.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
> diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
> index 775bcc3..5b62bd1f 100644
> --- a/arch/arm64/kernel/machine_kexec.c
> +++ b/arch/arm64/kernel/machine_kexec.c
> @@ -16,6 +16,12 @@
> #include <asm/cacheflush.h>
> #include <asm/system_misc.h>
> +/* TODO: Remove this include when KVM can support a kexc reboot. */
s/kexc/kexec/ here and below.
> +#include <asm/virt.h>
> +
> +/* TODO: Remove this include when EFI can support a kexc reboot. */
> +#include <linux/efi.h>
> +
> /* Global variables for the relocate_kernel routine. */
> extern const unsigned char relocate_new_kernel[];
> extern const unsigned long relocate_new_kernel_size;
> @@ -101,6 +107,22 @@ int machine_kexec_prepare(struct kimage *image)
>
> kexec_image_info(image);
>
> + /* TODO: Remove this message when KVM can support a kexc reboot. */
> + if (IS_ENABLED(CONFIG_KVM) && is_hyp_mode_available()) {
> + pr_err("%s: Your kernel is configued with KVM support "
Configured.
> + "(CONFIG_KVM=y) which currently does not allow for "
> + "kexec re-boot.\n", __func__);
> + return -ENOSYS;
> + }
> +
> + /* TODO: Remove this message when EFI can support a kexc reboot. */
> + if (efi_enabled(EFI_BOOT)) {
> + pr_err("%s: Your kernel is using the Extensible Firmware "
> + "Interface (EFI) which currently does not allow for "
> + "kexec re-boot.\n", __func__);
> + return -ENOSYS;
> + }
> +
> return 0;
> }
WBR, Sergei
