On Tue, Mar 28, 2023 at 08:57:58PM +0100, Usama Arif wrote:
> From: David Woodhouse <dwmw@xxxxxxxxxxxx>
>
> Enable parallel bringup for SEV-ES guests. The APs can't actually
> execute the CPUID instruction directly during early startup, but they
> can make the GHCB call directly instead, just as the VC trap handler
> would do.
>
> Thanks to Sabin for talking me through the way this works.
>
> Suggested-by: Sabin Rapan <sabrapan@xxxxxxxxxx>
> Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
> Signed-off-by: Usama Arif <usama.arif@xxxxxxxxxxxxx>
> Reviewed-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
> ---
> arch/x86/coco/core.c | 5 ++++
> arch/x86/include/asm/coco.h | 1 +
> arch/x86/include/asm/sev-common.h | 3 +++
> arch/x86/include/asm/smp.h | 5 +++-
> arch/x86/kernel/head_64.S | 30 ++++++++++++++++++++++++
> arch/x86/kernel/smpboot.c | 39 ++++++++++++++++++++++++++-----
> 6 files changed, 76 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c
> index 49b44f881484..0bab38efb15a 100644
> --- a/arch/x86/coco/core.c
> +++ b/arch/x86/coco/core.c
> @@ -129,6 +129,11 @@ u64 cc_mkdec(u64 val)
> }
> EXPORT_SYMBOL_GPL(cc_mkdec);
>
> +enum cc_vendor cc_get_vendor(void)
> +{
> + return vendor;
> +}
> +
> __init void cc_set_vendor(enum cc_vendor v)
> {
> vendor = v;
> diff --git a/arch/x86/include/asm/coco.h b/arch/x86/include/asm/coco.h
> index 3d98c3a60d34..0428d9712c96 100644
> --- a/arch/x86/include/asm/coco.h
> +++ b/arch/x86/include/asm/coco.h
> @@ -12,6 +12,7 @@ enum cc_vendor {
> };
>
> void cc_set_vendor(enum cc_vendor v);
> +enum cc_vendor cc_get_vendor(void);
> void cc_set_mask(u64 mask);
>
> #ifdef CONFIG_ARCH_HAS_CC_PLATFORM
You don't need those hunks adding cc_set_vendor() anymore:
https://git.kernel.org/tip/5ae57743f578725a5dadb6f31d7798ee55e6e967
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
