From: Joerg Roedel <jroedel@xxxxxxx>
SEV-ES needs special handling to support kexec. Disable it when SEV-ES
is active until support is implemented.
Cc: stable@xxxxxxxxxxxxxxx # v5.10+
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
arch/x86/kernel/machine_kexec_64.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index f5da4a18070a..5079a75f8944 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -269,11 +269,22 @@ static void load_segments(void)
);
}
+static bool machine_kexec_supported(void)
+{
+ if (cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
+ return false;
+
+ return true;
+}
+
int machine_kexec_prepare(struct kimage *image)
{
unsigned long start_pgtable;
int result;
+ if (!machine_kexec_supported())
+ return -ENOSYS;
+
/* Calculate the offsets */
start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
--
2.34.1
