linux-kernel - Re: [PATCH v6 04/18] x86/acrn: Introduce hypercall interfaces

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Date:   Wed, 30 Dec 2020 18:33:05 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     shuo.a.liu@...el.com
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Yu Wang <yu1.wang@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Yakui Zhao <yakui.zhao@...el.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Fengwei Yin <fengwei.yin@...el.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Peter Zijlstra <peterz@...radead.org>,
        Segher Boessenkool <segher@...nel.crashing.org>
Subject: Re: [PATCH v6 04/18] x86/acrn: Introduce hypercall interfaces

On Tue, Dec 01, 2020 at 05:38:39PM +0800, shuo.a.liu@...el.com wrote:
> From: Shuo Liu <shuo.a.liu@...el.com>
> 
> The Service VM communicates with the hypervisor via conventional
> hypercalls. VMCALL instruction is used to make the hypercalls.
> 
> ACRN hypercall ABI:
>   * Hypercall number is in R8 register.
>   * Up to 2 parameters are in RDI and RSI registers.
>   * Return value is in RAX register.
> 
> Introduce the ACRN hypercall interfaces. Because GCC doesn't support R8
> register as direct register constraints, use supported constraint as
> input with a explicit MOV to R8 in beginning of asm.
> 
> Originally-by: Yakui Zhao <yakui.zhao@...el.com>
> Signed-off-by: Shuo Liu <shuo.a.liu@...el.com>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: Dave Hansen <dave.hansen@...el.com>
> Cc: Sean Christopherson <sean.j.christopherson@...el.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Fengwei Yin <fengwei.yin@...el.com>
> Cc: Zhi Wang <zhi.a.wang@...el.com>
> Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
> Cc: Yu Wang <yu1.wang@...el.com>
> Cc: Reinette Chatre <reinette.chatre@...el.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Arvind Sankar <nivedita@...m.mit.edu>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: Segher Boessenkool <segher@...nel.crashing.org>
> ---
>  arch/x86/include/asm/acrn.h | 54 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)

The x86 bits in patches 2-4 look ok now, thanks!

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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