[PATCH v6 01/10] x86/kexec/64: Disable kexec when SEV-ES is active

vsntk18
2024-06-10T10:21:26Z

SEV-ES needs special handling to support kexec. Disable it when SEV-ES
is active until support is implemented.

Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Vasant Karasulli <vkarasulli@suse.de>
---
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 cc0f7f70b17b..1dfb47df5c01 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -267,11 +267,22 @@ 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