All of lore.kernel.org
 help / color / mirror / Atom feed
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Dave Hansen <dave.hansen@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	shuo.a.liu@intel.com, LKML <linux-kernel@vger.kernel.org>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>, "H . Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Yu Wang <yu1.wang@intel.com>,
	Reinette Chatre <reinette.chatre@intel.com>,
	Yakui Zhao <yakui.zhao@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Fengwei Yin <fengwei.yin@intel.com>,
	Zhi Wang <zhi.a.wang@intel.com>,
	Zhenyu Wang <zhenyuw@linux.intel.com>
Subject: Re: [PATCH v4 04/17] x86/acrn: Introduce hypercall interfaces
Date: Wed, 30 Sep 2020 18:25:59 -0500	[thread overview]
Message-ID: <20200930232559.GC28786@gate.crashing.org> (raw)
In-Reply-To: <CAKwvOdnpU=w4uStcP+UUr9wfoE5U-hW0cMt1bizcX4zQ4=-gOg@mail.gmail.com>

On Wed, Sep 30, 2020 at 12:14:03PM -0700, Nick Desaulniers wrote:
> Do we need register local storage here?

Depends what you want.  It looks like you do:

> static inline long bar(unsigned long hcall_id)
> {
>   long result;
>   asm volatile("movl %1, %%r8d\n\t"
>   "vmcall\n\t"
>     : "=a" (result)
>     : "ir" (hcall_id)
>     : );
>   return result;
> }

"result" as output from the asm is in %rax, and the compiler will
shuffle that to wherever it needs it as the function return value.  That
part will work fine.

But how you are accessing %r8d is not correct, that needs to be a local
register asm (or r8 be made a fixed reg, probably not what you want ;-) )


Segher

  parent reply	other threads:[~2020-09-30 23:32 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-22 11:42 [PATCH v4 00/17] HSM driver for ACRN hypervisor shuo.a.liu
2020-09-22 11:42 ` [PATCH v4 01/17] docs: acrn: Introduce ACRN shuo.a.liu
2020-10-09  1:48   ` Randy Dunlap
2020-10-12  8:50     ` Shuo A Liu
2020-09-22 11:42 ` [PATCH v4 02/17] x86/acrn: Introduce acrn_{setup, remove}_intr_handler() shuo.a.liu
2020-09-27 10:49   ` Greg Kroah-Hartman
2020-09-28  3:28     ` Shuo A Liu
2020-09-29 18:01   ` Borislav Petkov
2020-09-29 20:07     ` Thomas Gleixner
2020-09-29 20:26       ` Borislav Petkov
2020-09-30  3:02         ` Shuo A Liu
2020-09-22 11:42 ` [PATCH v4 03/17] x86/acrn: Introduce an API to check if a VM is privileged shuo.a.liu
2020-09-30  8:09   ` Borislav Petkov
2020-10-12  8:40     ` Shuo A Liu
2020-09-22 11:42 ` [PATCH v4 04/17] x86/acrn: Introduce hypercall interfaces shuo.a.liu
2020-09-27 10:51   ` Greg Kroah-Hartman
2020-09-27 10:53     ` Greg Kroah-Hartman
2020-09-28  3:38       ` Shuo A Liu
2020-09-27 15:38     ` Dave Hansen
2020-09-30 11:16       ` Peter Zijlstra
2020-09-30 16:10         ` Segher Boessenkool
2020-09-30 17:13           ` Peter Zijlstra
2020-09-30 19:14             ` Nick Desaulniers
2020-09-30 19:42               ` Peter Zijlstra
2020-09-30 23:58                 ` Segher Boessenkool
2020-09-30 19:59               ` Arvind Sankar
2020-09-30 20:01                 ` Arvind Sankar
2020-10-01  0:08                 ` Segher Boessenkool
2020-09-30 23:25               ` Segher Boessenkool [this message]
2020-09-30 23:38                 ` Arvind Sankar
2020-10-01  0:11                   ` Segher Boessenkool
2020-10-12  8:44               ` Shuo A Liu
2020-10-12 16:49                 ` Arvind Sankar
2020-10-13  2:44                   ` Shuo A Liu
2020-09-30 10:54   ` Borislav Petkov
2020-10-12  8:49     ` Shuo A Liu
2020-09-22 11:42 ` [PATCH v4 05/17] virt: acrn: Introduce ACRN HSM basic driver shuo.a.liu
2020-09-22 11:43 ` [PATCH v4 08/17] virt: acrn: Introduce EPT mapping management shuo.a.liu
2020-09-22 11:43 ` [PATCH v4 10/17] virt: acrn: Introduce PCI configuration space PIO accesses combiner shuo.a.liu
2020-09-22 11:43 ` [PATCH v4 11/17] virt: acrn: Introduce interfaces for PCI device passthrough shuo.a.liu
2020-09-22 11:43 ` [PATCH v4 12/17] virt: acrn: Introduce interrupt injection interfaces shuo.a.liu
2020-09-22 11:43 ` [PATCH v4 14/17] virt: acrn: Introduce I/O ranges operation interfaces shuo.a.liu
2020-09-22 11:43 ` [PATCH v4 16/17] virt: acrn: Introduce irqfd shuo.a.liu
2020-09-22 11:43 ` [PATCH v4 17/17] virt: acrn: Introduce an interface for Service VM to control vCPU shuo.a.liu
2020-09-27 10:44   ` Greg Kroah-Hartman
2020-09-28  4:10     ` Shuo A Liu
2020-09-28  5:23       ` Greg Kroah-Hartman
2020-09-28  6:33         ` Shuo A Liu
2020-09-27  0:24 ` [PATCH v4 00/17] HSM driver for ACRN hypervisor Liu, Shuo A
2020-09-27  5:42   ` Greg Kroah-Hartman
     [not found] ` <20200922114311.38804-7-shuo.a.liu@intel.com>
2020-09-27 10:45   ` [PATCH v4 06/17] virt: acrn: Introduce VM management interfaces Greg Kroah-Hartman
2020-09-28  3:43     ` Shuo A Liu
2020-09-27 10:47   ` Greg Kroah-Hartman
2020-09-28  3:50     ` Shuo A Liu
2020-09-28  5:25       ` Greg Kroah-Hartman
2020-09-28  6:29         ` Shuo A Liu
2020-09-28 12:26           ` Greg Kroah-Hartman
2020-09-30  2:49             ` Shuo A Liu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200930232559.GC28786@gate.crashing.org \
    --to=segher@kernel.crashing.org \
    --cc=bp@alien8.de \
    --cc=dan.j.williams@intel.com \
    --cc=dave.hansen@intel.com \
    --cc=fengwei.yin@intel.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=ndesaulniers@google.com \
    --cc=peterz@infradead.org \
    --cc=reinette.chatre@intel.com \
    --cc=sean.j.christopherson@intel.com \
    --cc=shuo.a.liu@intel.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    --cc=yakui.zhao@intel.com \
    --cc=yu1.wang@intel.com \
    --cc=zhenyuw@linux.intel.com \
    --cc=zhi.a.wang@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.