linux-kernel - Re: [PATCH Part2 v5 04/45] x86/sev: Add RMP entry lookup helpers

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Message-ID: <a5be6103-f643-fed2-b01a-d0310f447d7a@amd.com>
Date:   Mon, 27 Sep 2021 11:01:37 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     brijesh.singh@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        linux-crypto@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andi Kleen <ak@...ux.intel.com>, tony.luck@...el.com,
        marcorr@...gle.com, sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH Part2 v5 04/45] x86/sev: Add RMP entry lookup helpers

Hi Boris,

I agreed with all of your comment, responding to your specific questions.

On 9/24/21 4:49 AM, Borislav Petkov wrote:
...

>> +}
>> +EXPORT_SYMBOL_GPL(snp_lookup_rmpentry);
> 
> This export is for kvm, I presume?

yes, both KVM and CCP (i.e PSP) driver will need to lookup RMP entries.

> 
>> diff --git a/include/linux/sev.h b/include/linux/sev.h
>> new file mode 100644
>> index 000000000000..1a68842789e1
>> --- /dev/null
>> +++ b/include/linux/sev.h
>> @@ -0,0 +1,30 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * AMD Secure Encrypted Virtualization
>> + *
>> + * Author: Brijesh Singh <brijesh.singh@....com>
>> + */
>> +
>> +#ifndef __LINUX_SEV_H
>> +#define __LINUX_SEV_H
>> +
>> +/* RMUPDATE detected 4K page and 2MB page overlap. */
>> +#define RMPUPDATE_FAIL_OVERLAP		7
>> +
>> +#ifdef CONFIG_AMD_MEM_ENCRYPT
>> +int snp_lookup_rmpentry(u64 pfn, int *level);
>> +int psmash(u64 pfn);
>> +int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, int asid, bool immutable);
>> +int rmp_make_shared(u64 pfn, enum pg_level level);
>> +#else
>> +static inline int snp_lookup_rmpentry(u64 pfn, int *level) { return 0; }
>> +static inline int psmash(u64 pfn) { return -ENXIO; }
>> +static inline int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, int asid,
>> +				   bool immutable)
>> +{
>> +	return -ENODEV;
>> +}
>> +static inline int rmp_make_shared(u64 pfn, enum pg_level level) { return -ENODEV; }
>> +
>> +#endif /* CONFIG_AMD_MEM_ENCRYPT */
>> +#endif /* __LINUX_SEV_H */
>> -- 
> 
> What is going to use this linux/ namespace header?
> 

The kvm and ccp drivers.