From: Anchal Agarwal <anchalag@amazon.com>
To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org
Cc: jgross@suse.com, len.brown@intel.com, eduval@amazon.com,
vallish@amazon.com, netdev@vger.kernel.org, fllinden@amazon.com,
kamatam@amazon.com, rjw@rjwysocki.net,
linux-kernel@vger.kernel.org, anchalag@amazon.com,
cyberax@amazon.com, pavel@ucw.cz, linux-pm@vger.kernel.org,
xen-devel@lists.xenproject.org, boris.ostrovsky@oracle.com,
guruanb@amazon.com, roger.pau@citrix.com
Subject: [RFC PATCH 04/12] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume
Date: Tue, 12 Jun 2018 20:56:11 +0000 [thread overview]
Message-ID: <20180612205619.28156-5-anchalag@amazon.com> (raw)
In-Reply-To: <20180612205619.28156-1-anchalag@amazon.com>
Introduce a small function which re-uses shared page's PA allocated
during guest initialization time in reserve_shared_info() and not
allocate new page during resume flow.
It also does the mapping of shared_info_page by calling
xen_hvm_init_shared_info() to use the function.
Signed-off-by: Anchal Agarwal <anchalag@amazon.com>
Reviewed-by: Sebastian Biemueller <sbiemue@amazon.com>
Reviewed-by: Munehisa Kamata <kamatam@amazon.com>
Reviewed-by: Eduardo Valentin <eduval@amazon.com>
CR: https://cr.amazon.com/r/8273203/
---
arch/x86/xen/enlighten_hvm.c | 7 +++++++
arch/x86/xen/xen-ops.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
index 754d5391d9fa..2c4bcf92a90a 100644
--- a/arch/x86/xen/enlighten_hvm.c
+++ b/arch/x86/xen/enlighten_hvm.c
@@ -24,6 +24,13 @@
static unsigned long shared_info_pfn;
+void xen_hvm_map_shared_info(void)
+{
+ xen_hvm_init_shared_info();
+ if (shared_info_pfn)
+ HYPERVISOR_shared_info = __va(PFN_PHYS(shared_info_pfn));
+}
+
void xen_hvm_init_shared_info(void)
{
struct xen_add_to_physmap xatp;
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index f377e1820c6c..94c8a009ab35 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -58,6 +58,7 @@ void xen_enable_syscall(void);
void xen_vcpu_restore(void);
void xen_callback_vector(void);
+void xen_hvm_map_shared_info(void);
void xen_hvm_init_shared_info(void);
void xen_unplug_emulated_devices(void);
--
2.14.3
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next prev parent reply other threads:[~2018-06-12 20:56 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-12 20:56 [RFC PATCH 00/12] Enable PM hibernation on guest VMs Anchal Agarwal
2018-06-12 20:56 ` [RFC PATCH 01/12] xen/manage: keep track of the on-going suspend mode Anchal Agarwal
2018-06-13 16:42 ` Balbir Singh
2018-06-12 20:56 ` [RFC PATCH 02/12] xen/manage: introduce helper function to know " Anchal Agarwal
2018-06-13 17:41 ` Balbir Singh
2018-06-12 20:56 ` [RFC PATCH 03/12] xenbus: add freeze/thaw/restore callbacks support Anchal Agarwal
2018-06-12 20:56 ` Anchal Agarwal [this message]
2018-06-12 20:56 ` [RFC PATCH 05/12] x86/xen: add system core suspend and resume callbacks Anchal Agarwal
2018-06-12 20:56 ` [RFC PATCH 06/12] xen-blkfront: add callbacks for PM suspend and hibernation Anchal Agarwal
2018-06-13 8:24 ` Roger Pau Monné
2018-06-13 22:20 ` Anchal Agarwal
2018-06-14 8:43 ` Roger Pau Monné
2018-06-12 20:56 ` [RFC PATCH 07/12] xen-netfront: add callbacks for PM suspend and hibernation support Anchal Agarwal
2018-06-12 20:56 ` [RFC PATCH 08/12] xen-time-introduce-xen_-save-restore-_steal_clock Anchal Agarwal
2018-06-12 20:56 ` [RFC PATCH 09/12] x86/xen: save and restore steal clock Anchal Agarwal
2018-06-12 20:56 ` [RFC PATCH 10/12] xen/events: add xen_shutdown_pirqs helper function Anchal Agarwal
2018-06-12 20:56 ` [RFC PATCH 11/12] x86/xen: close event channels for PIRQs in system core suspend callback Anchal Agarwal
2018-06-12 20:56 ` [RFC PATCH 12/12] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP_AREA Anchal Agarwal
2018-06-14 19:45 ` Pavel Machek
2018-06-14 19:50 ` Besogonov, Aleksei
2018-06-12 21:09 ` [RFC PATCH 00/12] Enable PM hibernation on guest VMs Konrad Rzeszutek Wilk
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