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Message-ID: <e0362a96-4b3a-44b1-8d54-806a6b045799@amd.com>
Date: Fri, 21 Mar 2025 21:39:22 +0530
From: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
dave.hansen@...ux.intel.com, Thomas.Lendacky@....com, nikunj@....com,
Santosh.Shukla@....com, Vasant.Hegde@....com, Suravee.Suthikulpanit@....com,
David.Kaplan@....com, x86@...nel.org, hpa@...or.com, peterz@...radead.org,
seanjc@...gle.com, pbonzini@...hat.com, kvm@...r.kernel.org,
kirill.shutemov@...ux.intel.com, huibo.wang@....com, naveen.rao@....com
Subject: Re: [RFC v2 01/17] x86/apic: Add new driver for Secure AVIC
On 3/21/2025 7:25 PM, Borislav Petkov wrote:
> On Fri, Mar 21, 2025 at 09:14:15AM +0530, Neeraj Upadhyay wrote:
>> Do you think we should handle this case differently and not force select
>> AMD_SECURE_AVIC config when AMD_MEM_ENCRYPT config is enabled?
>
> Yeah, you'd have to do some simple CONFIG_AMD_SECURE_AVIC ifdeffery and add
> (or not) the flag to SNP_FEATURES_PRESENT, depending...
>
Ok, something like below?
+#ifdef CONFIG_AMD_SECURE_AVIC
+#define SNP_SECURE_AVIC MSR_AMD64_SNP_SECURE_AVIC
+#else
+#define SNP_SECURE_AVIC 0
+#endif
+
#define SNP_FEATURES_PRESENT (MSR_AMD64_SNP_DEBUG_SWAP | \
MSR_AMD64_SNP_SECURE_TSC | \
- MSR_AMD64_SNP_SECURE_AVIC)
+ SNP_SECURE_AVIC)
- Neeraj
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