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From: Dave Hansen <dave.hansen@intel.com>
To: Joerg Roedel <joro@8bytes.org>, x86@kernel.org
Cc: Eric Biederman <ebiederm@xmission.com>,
	kexec@lists.infradead.org, Joerg Roedel <jroedel@suse.de>,
	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 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests
Date: Mon, 13 Sep 2021 09:02:38 -0700	[thread overview]
Message-ID: <4e033293-b81d-1e21-6fd6-f507b6821d3c@intel.com> (raw)
In-Reply-To: <20210913155603.28383-1-joro@8bytes.org>

On 9/13/21 8:55 AM, Joerg Roedel wrote:
> This does not work under SEV-ES, because the hypervisor has no access
> to the vCPU registers and can't make modifications to them. So an
> SEV-ES guest needs to reset the vCPU itself and park it using the
> AP-reset-hold protocol. Upon wakeup the guest needs to jump to
> real-mode and to the reset-vector configured in the AP-Jump-Table.

How does this end up looking to an end user that tries to kexec() from a
an SEV-ES kernel?  Does it just hang?

  parent reply	other threads:[~2021-09-13 16:02 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
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
2021-11-01 16:10   ` Borislav Petkov
2021-11-01 21:11     ` Eric W. Biederman
2021-11-02 16:37       ` Joerg Roedel
2021-11-02 17:00       ` Joerg Roedel
2021-11-02 18:17         ` Eric W. Biederman
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 ` [PATCH v2 03/12] x86/sev: Save and print negotiated GHCB protocol version Joerg Roedel
2021-11-03 14:27   ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 04/12] x86/sev: Do not hardcode " Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 05/12] x86/sev: Use GHCB protocol version 2 if supported Joerg Roedel
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
2021-11-08 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
2021-11-10 16:37   ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 08/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2 Joerg Roedel
2021-11-12 16:33   ` Borislav Petkov
2021-09-13 15:56 ` [PATCH v2 09/12] x86/sev: Use AP Jump Table blob to stop CPU Joerg Roedel
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 ` [PATCH v2 11/12] x86/sev: Handle CLFLUSH MMIO events 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 16:02 ` Dave Hansen [this message]
2021-09-13 16:14   ` [PATCH v2 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests Joerg Roedel
2021-09-13 16:21     ` Dave Hansen

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