[PATCH v2 0/2] x86: Disable kexec for SEV-ES guests

[PATCH v2 0/2] x86: Disable kexec for SEV-ES guests

[Joerg Roedel]

From: Joerg Roedel <jroedel@suse.de>

Changes v1->v2:

	- Rebased to v5.13-rc4
	- Add the check also to the kexec_file_load system call

Original cover letter:

Hi,

two small patches to disable kexec on x86 when running as an SEV-ES
guest. Trying to kexec a new kernel would fail anyway because there is
no mechanism yet to hand over the APs from the old to the new kernel.
Supporting this needs changes in the Hypervisor and the guest kernel
as well.

This code is currently being work on, but disable kexec in SEV-ES
guests until it is ready.

Please review.

Regards,

	Joerg

Joerg Roedel (2):
  kexec: Allow architecture code to opt-out at runtime
  x86/kexec/64: Forbid kexec when running as an SEV-ES guest

 arch/x86/kernel/machine_kexec_64.c |  8 ++++++++
 include/linux/kexec.h              |  1 +
 kernel/kexec.c                     | 14 ++++++++++++++
 kernel/kexec_file.c                |  9 +++++++++
 4 files changed, 32 insertions(+)

-- 
2.31.1

[PATCH v2 1/2] kexec: Allow architecture code to opt-out at runtime

[Joerg Roedel]

From: Joerg Roedel <jroedel@suse.de>

Allow a runtime opt-out of kexec support for architecture code in case
the kernel is running in an environment where kexec is not properly
supported yet.

This will be used on x86 when the kernel is running as an SEV-ES
guest. SEV-ES guests need special handling for kexec to hand over all
CPUs to the new kernel. This requires special hypervisor support and
handling code in the guest which is not yet implemented.

Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 include/linux/kexec.h |  1 +
 kernel/kexec.c        | 14 ++++++++++++++
 kernel/kexec_file.c   |  9 +++++++++
 3 files changed, 24 insertions(+)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 0c994ae37729..85c30dcd0bdc 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -201,6 +201,7 @@ int arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
 				 unsigned long buf_len);
 #endif
 int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
+bool arch_kexec_supported(void);
 
 extern int kexec_add_buffer(struct kexec_buf *kbuf);
 int kexec_locate_mem_hole(struct kexec_buf *kbuf);
diff --git a/kernel/kexec.c b/kernel/kexec.c
index c82c6c06f051..d03134160458 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -195,11 +195,25 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
  * that to happen you need to do that yourself.
  */
 
+bool __weak arch_kexec_supported(void)
+{
+	return true;
+}
+
 static inline int kexec_load_check(unsigned long nr_segments,
 				   unsigned long flags)
 {
 	int result;
 
+	/*
+	 * The architecture may support kexec in general, but the kernel could
+	 * run in an environment where it is not (yet) possible to execute a new
+	 * kernel. Allow the architecture code to opt-out of kexec support when
+	 * it is running in such an environment.
+	 */
+	if (!arch_kexec_supported())
+		return -ENOSYS;
+
 	/* We only trust the superuser with rebooting the system. */
 	if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
 		return -EPERM;
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 33400ff051a8..96d08a512e9c 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -358,6 +358,15 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
 	int ret = 0, i;
 	struct kimage **dest_image, *image;
 
+	/*
+	 * The architecture may support kexec in general, but the kernel could
+	 * run in an environment where it is not (yet) possible to execute a new
+	 * kernel. Allow the architecture code to opt-out of kexec support when
+	 * it is running in such an environment.
+	 */
+	if (!arch_kexec_supported())
+		return -ENOSYS;
+
 	/* We only trust the superuser with rebooting the system. */
 	if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
 		return -EPERM;
-- 
2.31.1

[PATCH v2 2/2] x86/kexec/64: Forbid kexec when running as an SEV-ES guest

[Joerg Roedel]

From: Joerg Roedel <jroedel@suse.de>

For now, kexec is not supported when running as an SEV-ES guest. Doing
so requires additional hypervisor support and special code to hand
over the CPUs to the new kernel in a safe way.

Until this is implemented, do not support kexec in SEV-ES guests.

Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 arch/x86/kernel/machine_kexec_64.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index c078b0d3ab0e..f902cc9cc634 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -620,3 +620,11 @@ void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages)
 	 */
 	set_memory_encrypted((unsigned long)vaddr, pages);
 }
+
+/*
+ * Kexec is not supported in SEV-ES guests yet
+ */
+bool arch_kexec_supported(void)
+{
+	return !sev_es_active();
+}
-- 
2.31.1

Re: [PATCH v2 0/2] x86: Disable kexec for SEV-ES guests

[Joerg Roedel]

Gentle ping.

On Thu, Jun 03, 2021 at 03:22:31PM +0200, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@suse.de>
> 
> Changes v1->v2:
> 
> 	- Rebased to v5.13-rc4
> 	- Add the check also to the kexec_file_load system call
> 
> Original cover letter:
> 
> Hi,
> 
> two small patches to disable kexec on x86 when running as an SEV-ES
> guest. Trying to kexec a new kernel would fail anyway because there is
> no mechanism yet to hand over the APs from the old to the new kernel.
> Supporting this needs changes in the Hypervisor and the guest kernel
> as well.
> 
> This code is currently being work on, but disable kexec in SEV-ES
> guests until it is ready.
> 
> Please review.
> 
> Regards,
> 
> 	Joerg
> 
> Joerg Roedel (2):
>   kexec: Allow architecture code to opt-out at runtime
>   x86/kexec/64: Forbid kexec when running as an SEV-ES guest
> 
>  arch/x86/kernel/machine_kexec_64.c |  8 ++++++++
>  include/linux/kexec.h              |  1 +
>  kernel/kexec.c                     | 14 ++++++++++++++
>  kernel/kexec_file.c                |  9 +++++++++
>  4 files changed, 32 insertions(+)
> 
> -- 
> 2.31.1