Re: HVMLite / PVHv2 - using x86 EFI boot entry

From: Matt Fleming <matt@codeblueprint.co.uk>
To: "Roger Pau Monné" <roger.pau@citrix.com>
Cc: "Michael Chang" <MChang@suse.com>,
	"Jim Fehlig" <jfehlig@suse.com>,
	"Jan Beulich" <JBeulich@suse.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Daniel Kiper" <daniel.kiper@oracle.com>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	"Vojtěch Pavlík" <vojtech@suse.cz>, "Gary Lin" <GLin@suse.com>,
	xen-devel <xen-devel@lists.xenproject.org>,
	"Jeffrey Cheung" <JCheung@suse.com>,
	"Juergen Gross" <jgross@suse.com>,
	"Julien Grall" <julien.grall@arm.com>,
	"Stefano Stabellini" <stefano.stabellini@eu.citrix.com>,
	"George Dunlap" <george.dunlap@citrix.com>,
	joeyli <jlee@suse.com>, "Borislav Petkov" <bp@alien8.de>,
	"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
	"Charles Arndol" <carnold@suse.com>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Andy Lutomirski" <luto@amacapital.net>,
	"Luis R. Rodriguez" <mcgrof@kernel.org>
Subject: Re: HVMLite / PVHv2 - using x86 EFI boot entry
Date: Wed, 13 Apr 2016 11:21:57 +0100	[thread overview]
Message-ID: <20160413102157.GK2829__7878.72090372748$1460542985$gmane$org@codeblueprint.co.uk> (raw)
In-Reply-To: <20160413100312.647eocdtbmak4btk@mac>

On Wed, 13 Apr, at 12:03:12PM, Roger Pau Monné wrote:
> 
> I don't get this, the "reset/shutdown" hypercall requires the following 
> steps from Dom0 (it's not as simple as calling a hypercall):
> 
> The way to perform a full system power off from Dom0 is different than 
> what's done in a DomU guest. In order to perform a power off from Dom0 the 
> native ACPI path should be followed, but the guest should not write the 
> `SLP_EN` bit to the Pm1Control register. Instead the 
> `XENPF_enter_acpi_sleep` hypercall should be used, filling the following 
> data in the `xen_platform_op` struct:
> 
>     cmd = XENPF_enter_acpi_sleep
>     interface_version = XENPF_INTERFACE_VERSION
>     u.enter_acpi_sleep.pm1a_cnt_val = Pm1aControlValue
>     u.enter_acpi_sleep.pm1b_cnt_val = Pm1bControlValue
> 
> At which point it means that we are either going to duplicate ACPICA code 
> into the HVMlite's custom EfiReset() service, or we are going to call into 
> ACPICA, which is what we already do now.

Fair enough, I wasn't aware that you needed to call into ACPI to
perform the reset.

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