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Date: Tue, 10 Aug 2021 11:17:07 +0200 From: Borislav Petkov <bp@...en8.de> To: Brijesh Singh <brijesh.singh@....com> Cc: x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, linux-efi@...r.kernel.org, platform-driver-x86@...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>, tony.luck@...el.com, npmccallum@...hat.com, brijesh.ksingh@...il.com Subject: Re: [PATCH Part1 RFC v4 02/36] x86/sev: Save the negotiated GHCB version On Wed, Jul 07, 2021 at 01:14:32PM -0500, Brijesh Singh wrote: > diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c > index 114f62fe2529..19c2306ac02d 100644 > --- a/arch/x86/kernel/sev-shared.c > +++ b/arch/x86/kernel/sev-shared.c > @@ -14,6 +14,15 @@ > #define has_cpuflag(f) boot_cpu_has(f) > #endif > > +/* > + * Since feature negotiation related variables are set early in the boot > + * process they must reside in the .data section so as not to be zeroed > + * out when the .bss section is later cleared. > + * > + * GHCB protocol version negotiated with the hypervisor. > + */ > +static u16 ghcb_version __section(".data..ro_after_init"); There's a define for that section specifier: __ro_after_init -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette
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