linux-kernel - Re: [RFC PATCH V4 12/17] x86/sev: Add a #HV exception handler

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Date:   Mon, 3 Apr 2023 20:06:08 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tianyu Lan <ltykernel@...il.com>
Cc:     luto@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        seanjc@...gle.com, pbonzini@...hat.com, jgross@...e.com,
        tiala@...rosoft.com, kirill@...temov.name,
        jiangshan.ljs@...group.com, peterz@...radead.org,
        ashish.kalra@....com, srutherford@...gle.com,
        akpm@...ux-foundation.org, anshuman.khandual@....com,
        pawan.kumar.gupta@...ux.intel.com, adrian.hunter@...el.com,
        daniel.sneddon@...ux.intel.com, alexander.shishkin@...ux.intel.com,
        sandipan.das@....com, ray.huang@....com, brijesh.singh@....com,
        michael.roth@....com, thomas.lendacky@....com,
        venu.busireddy@...cle.com, sterritt@...gle.com,
        tony.luck@...el.com, samitolvanen@...gle.com, fenghua.yu@...el.com,
        pangupta@....com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [RFC PATCH V4 12/17] x86/sev: Add a #HV exception handler

On Mon, Apr 03, 2023 at 01:44:00PM -0400, Tianyu Lan wrote:
> From: Tianyu Lan <tiala@...rosoft.com>
> 
> Add a #HV exception handler that uses IST stack.
> 
> Signed-off-by: Tianyu Lan <tiala@...rosoft.com>
> ---
> Change since RFC V2:
>        * Remove unnecessary line in the change log.
> ---
>  arch/x86/entry/entry_64.S             | 60 +++++++++++++++++++++++++++
>  arch/x86/include/asm/cpu_entry_area.h |  6 +++
>  arch/x86/include/asm/idtentry.h       | 39 ++++++++++++++++-
>  arch/x86/include/asm/page_64_types.h  |  1 +
>  arch/x86/include/asm/trapnr.h         |  1 +
>  arch/x86/include/asm/traps.h          |  1 +
>  arch/x86/kernel/cpu/common.c          |  1 +
>  arch/x86/kernel/dumpstack_64.c        |  9 +++-
>  arch/x86/kernel/idt.c                 |  1 +
>  arch/x86/kernel/sev.c                 | 53 +++++++++++++++++++++++
>  arch/x86/kernel/traps.c               | 40 ++++++++++++++++++
>  arch/x86/mm/cpu_entry_area.c          |  2 +
>  12 files changed, 211 insertions(+), 3 deletions(-)

Same comment as here:

https://lore.kernel.org/r/20230331155714.GCZCcC2pHVZgIHr8k8@fat_crate.local

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette