From: Joerg Roedel <jroedel@suse.de>
To: kexec@lists.infradead.org
Subject: [PATCH v2 08/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2
Date: Thu, 27 Jan 2022 10:01:31 +0100 [thread overview]
Message-ID: <YfJfa955Pkg1y6Gv@suse.de> (raw)
In-Reply-To: <YY6XQfmvmpmUiIGj@zn.tnic>
On Fri, Nov 12, 2021 at 05:33:05PM +0100, Borislav Petkov wrote:
> On Mon, Sep 13, 2021 at 05:55:59PM +0200, Joerg Roedel wrote:
> > + "ljmpl *%0" : :
> > + "m" (real_mode_header->sev_real_ap_park_asm),
> > + "b" (sev_es_jump_table_pa >> 4));
>
> In any case, this asm needs comments: why those regs, why
> sev_es_jump_table_pa >> 4 in rbx (I found later in the patch why) and so
> on.
Turned out the jump_table_pa is not used in asm code anymore. It was a
left-over from a previous version of the patch, it is removed now.
> > +SYM_INNER_LABEL(sev_ap_park_paging_off, SYM_L_GLOBAL)
>
> Global symbol but used only in this file. .L-prefix then?
It needs to be a global symbol so the pa_ variant can be generated.
Regards,
--
J?rg R?del
jroedel at suse.de
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5
90409 N?rnberg
Germany
(HRB 36809, AG N?rnberg)
Gesch?ftsf?hrer: Ivo Totev
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <jroedel@suse.de>
To: Borislav Petkov <bp@alien8.de>
Cc: Joerg Roedel <joro@8bytes.org>,
x86@kernel.org, Eric Biederman <ebiederm@xmission.com>,
kexec@lists.infradead.org, hpa@zytor.com,
Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Jiri Slaby <jslaby@suse.cz>,
Dan Williams <dan.j.williams@intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Juergen Gross <jgross@suse.com>,
Kees Cook <keescook@chromium.org>,
David Rientjes <rientjes@google.com>,
Cfir Cohen <cfir@google.com>, Erdem Aktas <erdemaktas@google.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Mike Stunes <mstunes@vmware.com>,
Sean Christopherson <seanjc@google.com>,
Martin Radev <martin.b.radev@gmail.com>,
Arvind Sankar <nivedita@alum.mit.edu>,
linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v2 08/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2
Date: Thu, 27 Jan 2022 10:01:31 +0100 [thread overview]
Message-ID: <YfJfa955Pkg1y6Gv@suse.de> (raw)
In-Reply-To: <YY6XQfmvmpmUiIGj@zn.tnic>
On Fri, Nov 12, 2021 at 05:33:05PM +0100, Borislav Petkov wrote:
> On Mon, Sep 13, 2021 at 05:55:59PM +0200, Joerg Roedel wrote:
> > + "ljmpl *%0" : :
> > + "m" (real_mode_header->sev_real_ap_park_asm),
> > + "b" (sev_es_jump_table_pa >> 4));
>
> In any case, this asm needs comments: why those regs, why
> sev_es_jump_table_pa >> 4 in rbx (I found later in the patch why) and so
> on.
Turned out the jump_table_pa is not used in asm code anymore. It was a
left-over from a previous version of the patch, it is removed now.
> > +SYM_INNER_LABEL(sev_ap_park_paging_off, SYM_L_GLOBAL)
>
> Global symbol but used only in this file. .L-prefix then?
It needs to be a global symbol so the pa_ variant can be generated.
Regards,
--
Jörg Rödel
jroedel@suse.de
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5
90409 Nürnberg
Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <jroedel@suse.de>
To: Borislav Petkov <bp@alien8.de>
Cc: kvm@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
virtualization@lists.linux-foundation.org,
Arvind Sankar <nivedita@alum.mit.edu>,
hpa@zytor.com, Jiri Slaby <jslaby@suse.cz>,
Joerg Roedel <joro@8bytes.org>,
x86@kernel.org, David Rientjes <rientjes@google.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Martin Radev <martin.b.radev@gmail.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Kees Cook <keescook@chromium.org>, Cfir Cohen <cfir@google.com>,
linux-coco@lists.linux.dev, Andy Lutomirski <luto@kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Juergen Gross <jgross@suse.com>, Mike Stunes <mstunes@vmware.com>,
Sean Christopherson <seanjc@google.com>,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
Eric Biederman <ebiederm@xmission.com>,
Erdem Aktas <erdemaktas@google.com>
Subject: Re: [PATCH v2 08/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2
Date: Thu, 27 Jan 2022 10:01:31 +0100 [thread overview]
Message-ID: <YfJfa955Pkg1y6Gv@suse.de> (raw)
In-Reply-To: <YY6XQfmvmpmUiIGj@zn.tnic>
On Fri, Nov 12, 2021 at 05:33:05PM +0100, Borislav Petkov wrote:
> On Mon, Sep 13, 2021 at 05:55:59PM +0200, Joerg Roedel wrote:
> > + "ljmpl *%0" : :
> > + "m" (real_mode_header->sev_real_ap_park_asm),
> > + "b" (sev_es_jump_table_pa >> 4));
>
> In any case, this asm needs comments: why those regs, why
> sev_es_jump_table_pa >> 4 in rbx (I found later in the patch why) and so
> on.
Turned out the jump_table_pa is not used in asm code anymore. It was a
left-over from a previous version of the patch, it is removed now.
> > +SYM_INNER_LABEL(sev_ap_park_paging_off, SYM_L_GLOBAL)
>
> Global symbol but used only in this file. .L-prefix then?
It needs to be a global symbol so the pa_ variant can be generated.
Regards,
--
Jörg Rödel
jroedel@suse.de
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5
90409 Nürnberg
Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2022-01-27 9:01 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-13 15:55 [PATCH v2 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests Joerg Roedel
2021-09-13 15:55 ` Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 01/12] kexec: Allow architecture code to opt-out at runtime Joerg Roedel
2021-09-13 15:55 ` Joerg Roedel
2021-11-01 16:10 ` Borislav Petkov
2021-11-01 16:10 ` Borislav Petkov
2021-11-01 16:10 ` Borislav Petkov
2021-11-01 21:11 ` Eric W. Biederman
2021-11-01 21:11 ` Eric W. Biederman
2021-11-01 21:11 ` Eric W. Biederman
2021-11-02 16:37 ` Joerg Roedel
2021-11-02 16:37 ` Joerg Roedel
2021-11-02 16:37 ` Joerg Roedel
2021-11-02 17:00 ` Joerg Roedel
2021-11-02 17:00 ` Joerg Roedel
2021-11-02 17:00 ` Joerg Roedel
2021-11-02 18:17 ` Eric W. Biederman
2021-11-02 18:17 ` Eric W. Biederman
2021-11-02 18:17 ` Eric W. Biederman
2021-11-02 17:17 ` Borislav Petkov
2021-11-02 17:17 ` Borislav Petkov
2021-11-02 17:17 ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 02/12] x86/kexec/64: Forbid kexec when running as an SEV-ES guest Joerg Roedel
2021-09-13 15:55 ` Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 03/12] x86/sev: Save and print negotiated GHCB protocol version Joerg Roedel
2021-09-13 15:55 ` Joerg Roedel
2021-11-03 14:27 ` Borislav Petkov
2021-11-03 14:27 ` Borislav Petkov
2021-11-03 14:27 ` Borislav Petkov
2022-01-26 9:27 ` Joerg Roedel
2022-01-26 9:27 ` Joerg Roedel
2022-01-26 9:27 ` Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 04/12] x86/sev: Do not hardcode " Joerg Roedel
2021-09-13 15:55 ` Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 05/12] x86/sev: Use GHCB protocol version 2 if supported Joerg Roedel
2021-09-13 15:55 ` Joerg Roedel
2021-11-03 16:05 ` Borislav Petkov
2021-11-03 16:05 ` Borislav Petkov
2021-11-03 16:05 ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 06/12] x86/sev: Cache AP Jump Table Address Joerg Roedel
2021-09-13 15:55 ` Joerg Roedel
2021-11-08 18:14 ` Borislav Petkov
2021-11-08 18:14 ` Borislav Petkov
2021-11-08 18:14 ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 07/12] x86/sev: Setup code to park APs in the AP Jump Table Joerg Roedel
2021-09-13 15:55 ` Joerg Roedel
2021-11-10 16:37 ` Borislav Petkov
2021-11-10 16:37 ` Borislav Petkov
2021-11-10 16:37 ` Borislav Petkov
2022-01-26 14:26 ` Joerg Roedel
2022-01-26 14:26 ` Joerg Roedel
2022-01-26 14:26 ` Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 08/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2 Joerg Roedel
2021-09-13 15:55 ` Joerg Roedel
2021-11-12 16:33 ` Borislav Petkov
2021-11-12 16:33 ` Borislav Petkov
2021-11-12 16:33 ` Borislav Petkov
2022-01-27 9:01 ` Joerg Roedel [this message]
2022-01-27 9:01 ` Joerg Roedel
2022-01-27 9:01 ` Joerg Roedel
2021-09-13 15:56 ` [PATCH v2 09/12] x86/sev: Use AP Jump Table blob to stop CPU Joerg Roedel
2021-09-13 15:56 ` Joerg Roedel
2021-11-15 18:44 ` Borislav Petkov
2021-11-15 18:44 ` Borislav Petkov
2021-11-15 18:44 ` Borislav Petkov
2021-09-13 15:56 ` [PATCH v2 10/12] x86/sev: Add MMIO handling support to boot/compressed/ code Joerg Roedel
2021-09-13 15:56 ` Joerg Roedel
2021-09-13 15:56 ` [PATCH v2 11/12] x86/sev: Handle CLFLUSH MMIO events Joerg Roedel
2021-09-13 15:56 ` Joerg Roedel
2021-09-13 15:56 ` [PATCH v2 12/12] x86/sev: Support kexec under SEV-ES with AP Jump Table blob Joerg Roedel
2021-09-13 15:56 ` Joerg Roedel
2021-09-13 16:02 ` [PATCH v2 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests Dave Hansen
2021-09-13 16:02 ` Dave Hansen
2021-09-13 16:02 ` Dave Hansen
2021-09-13 16:14 ` Joerg Roedel
2021-09-13 16:14 ` Joerg Roedel
2021-09-13 16:14 ` Joerg Roedel
2021-09-13 16:21 ` Dave Hansen
2021-09-13 16:21 ` Dave Hansen
2021-09-13 16:21 ` Dave Hansen
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