linux-kernel - [PATCH v2] KVM: SVM: Dump Virtual Machine Save Area (VMSA) to klog

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Message-Id: <20220729122150.601-1-jarkko@profian.com>
Date:   Fri, 29 Jul 2022 15:21:50 +0300
From:   Jarkko Sakkinen <jarkko@...fian.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Jarkko Sakkinen <jarkko@...fian.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Harald Hoyer <harald@...fian.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        "H. Peter Anvin" <hpa@...or.com>,
        kvm@...r.kernel.org (open list:KERNEL VIRTUAL MACHINE FOR X86 (KVM/x86)),
        linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND
        64-BIT))
Subject: [PATCH v2] KVM: SVM: Dump Virtual Machine Save Area (VMSA) to klog

As Virtual Machine Save Area (VMSA) is essential in troubleshooting
attestation, dump it to the klog with the KERN_DEBUG level of priority.

Cc: Jarkko Sakkinen <jarkko@...nel.org>
Suggested-by: Harald Hoyer <harald@...fian.com>
Signed-off-by: Jarkko Sakkinen <jarkko@...fian.com>
---
 arch/x86/kvm/svm/sev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 0c240ed04f96..c91a905436d5 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -603,6 +603,10 @@ static int sev_es_sync_vmsa(struct vcpu_svm *svm)
 	save->xss  = svm->vcpu.arch.ia32_xss;
 	save->dr6  = svm->vcpu.arch.dr6;
 
+	if (printk_ratelimit()) {
+		print_hex_dump(KERN_DEBUG, "VMSA", DUMP_PREFIX_NONE, 16, 1, save, sizeof(*save), false);
+	}
+
 	return 0;
 }
 
-- 
v2:
- Use KERN_DEBUG for print_hex_dump()
- Check for ratelimit.
2.37.1