linux-kernel - [PATCH v3 01/10] x86/kexec/64: Disable kexec when SEV-ES is active

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Date:   Thu, 27 Jan 2022 11:10:35 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     x86@...nel.org
Cc:     Joerg Roedel <joro@...tes.org>, Joerg Roedel <jroedel@...e.de>,
        stable@...r.kernel.org, Eric Biederman <ebiederm@...ssion.com>,
        kexec@...ts.infradead.org, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Martin Radev <martin.b.radev@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: [PATCH v3 01/10] x86/kexec/64: Disable kexec when SEV-ES is active

From: Joerg Roedel <jroedel@...e.de>

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

Cc: stable@...r.kernel.org # v5.10+
Signed-off-by: Joerg Roedel <jroedel@...e.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 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