Re: [PATCH Part1 RFC v4 02/36] x86/sev: Save the negotiated GHCB version
From: Borislav Petkov <bp@alien8.de>
Date: 2021-08-10 09:16:46
Also in:
linux-coco, linux-crypto, linux-efi, linux-mm, lkml, platform-driver-x86
On Wed, Jul 07, 2021 at 01:14:32PM -0500, Brijesh Singh wrote:
quoted hunk ↗ jump to hunk
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