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Fri, 16 Dec 2016 15:18:46 -0800 From: Boris Ostrovsky To: xen-devel@lists.xen.org Date: Fri, 16 Dec 2016 18:18:39 -0500 Message-Id: <1481930319-4796-14-git-send-email-boris.ostrovsky@oracle.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1481930319-4796-1-git-send-email-boris.ostrovsky@oracle.com> References: <1481930319-4796-1-git-send-email-boris.ostrovsky@oracle.com> X-Source-IP: aserv0021.oracle.com [141.146.126.233] Cc: Stefano Stabellini , wei.liu2@citrix.com, George Dunlap , andrew.cooper3@citrix.com, ian.jackson@eu.citrix.com, Tim Deegan , jbeulich@suse.com, Boris Ostrovsky , roger.pau@citrix.com Subject: [Xen-devel] [PATCH v5 13/13] docs: Describe PVHv2's VCPU hotplug procedure X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Boris Ostrovsky Reviewed-by: Konrad Rzeszutek Wilk --- CC: George Dunlap CC: Konrad Rzeszutek Wilk CC: Stefano Stabellini CC: Tim Deegan --- docs/misc/hvmlite.markdown | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/docs/misc/hvmlite.markdown b/docs/misc/hvmlite.markdown index 898b8ee..71c6bc2 100644 --- a/docs/misc/hvmlite.markdown +++ b/docs/misc/hvmlite.markdown @@ -75,3 +75,16 @@ info structure that's passed at boot time (field rsdp_paddr). Description of paravirtualized devices will come from XenStore, just as it's done for HVM guests. + +## VCPU hotplug ## + +VCPU hotplug (e.g. 'xl vcpu-set ') for PVHv2 guests +follows ACPI model where change in domain's number of VCPUS (stored in +domain.avail_vcpus) results in an SCI being sent to the guest. The guest +then executes DSDT's PRSC method, updating MADT enable status for the +affected VCPU. + +This is achieved by having the toolstack issue a write to ACPI's +XEN_ACPI_CPU_MAP (thus updating the VCPU available map stored there), +followed by a write to ACPI GPE0 status register, setting XEN_GPE0_CPUHP_BIT. +The latter will cause an SCI to be generated.