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

From: vsntk18@gmail.com
To: vsntk18@gmail.com
Cc: x86@kernel.org, Borislav.Petkov@amd.com, Dhaval.Giani@amd.com,
	ashish.kalra@amd.com, cfir@google.com, dan.j.williams@intel.com,
	dave.hansen@linux.intel.com, ebiederm@xmission.com,
	erdemaktas@google.com, hpa@zytor.com, jgross@suse.com,
	jroedel@suse.de, jslaby@suse.cz, keescook@chromium.org,
	kexec@lists.infradead.org, kvm@vger.kernel.org,
	linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
	luto@kernel.org, martin.b.radev@gmail.com, mhiramat@kernel.org,
	michael.roth@amd.com, mstunes@vmware.com, nivedita@alum.mit.edu,
	peterz@infradead.org, rientjes@google.com, seanjc@google.com,
	stable@vger.kernel.org, thomas.lendacky@amd.com,
	virtualization@lists.linux-foundation.org, vkarasulli@suse.de
Subject: [PATCH v6 01/10] x86/kexec/64: Disable kexec when SEV-ES is active
Date: Mon, 10 Jun 2024 12:21:04 +0200	[thread overview]
Message-ID: <20240610102113.20969-2-vsntk18@gmail.com> (raw)
In-Reply-To: <20240610102113.20969-1-vsntk18@gmail.com>

From: Joerg Roedel <jroedel@suse.de>

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


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