linux-kernel - Re: [PATCH] x86/coco, x86/sev: Use cpu_feature

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Message-ID: <20231205203337.GKZW+JIe9m2/QVi7Xl@fat_crate.local>
Date:   Tue, 5 Dec 2023 21:33:37 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/coco, x86/sev: Use cpu_feature_enabled() to detect
 SEV guest flavor

On Tue, Dec 05, 2023 at 07:52:41PM +0100, Borislav Petkov wrote:
> So yes, we will fix your issue, no worries. I'm figuring out the
> details as we speak.

So you can do for the short term:

---
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index c461c1a4b6af..f8999f6d1b00 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -434,7 +434,7 @@ static void __init sev_map_percpu_data(void)
 {
 	int cpu;
 
-	if (!cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
+	if (cc_vendor != CC_VENDOR_AMD || !cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
 		return;
 
 	for_each_possible_cpu(cpu) {
---

until we've sorted out the bigger picture.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette