From: Dexuan Cui <decui@microsoft.com>
To: "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
Stephen Hemminger <sthemmin@microsoft.com>,
Sasha Levin <Alexander.Levin@microsoft.com>,
"sashal@kernel.org" <sashal@kernel.org>,
Haiyang Zhang <haiyangz@microsoft.com>,
KY Srinivasan <kys@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
"tglx@linutronix.de" <tglx@linutronix.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Dexuan Cui <decui@microsoft.com>
Subject: [PATCH v3 02/12] x86/hyper-v: Implement hv_is_hibernation_supported()
Date: Tue, 20 Aug 2019 01:51:59 +0000 [thread overview]
Message-ID: <1566265863-21252-3-git-send-email-decui@microsoft.com> (raw)
In-Reply-To: <1566265863-21252-1-git-send-email-decui@microsoft.com>
When a Linux VM runs on Hyper-V and hibernates, it must disable the
memory hot-add/remove and balloon up/down capabilities in the hv_balloon
driver.
By default, Hyper-V does not enable the virtual ACPI S4 state for a VM;
on recent Hyper-V hosts, the administrator is able to enable the virtual
ACPI S4 state for a VM, so we hope to use the presence of the virtual ACPI
S4 state as a hint for hv_balloon to disable the aforementioned
capabilities.
The new API will be used by hv_balloon.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
---
arch/x86/hyperv/hv_init.c | 7 +++++++
include/asm-generic/mshyperv.h | 2 ++
2 files changed, 9 insertions(+)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 78e53d9..6735e45 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -7,6 +7,7 @@
* Author : K. Y. Srinivasan <kys@microsoft.com>
*/
+#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/types.h>
#include <asm/apic.h>
@@ -453,3 +454,9 @@ bool hv_is_hyperv_initialized(void)
return hypercall_msr.enable;
}
EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized);
+
+bool hv_is_hibernation_supported(void)
+{
+ return acpi_sleep_state_supported(ACPI_STATE_S4);
+}
+EXPORT_SYMBOL_GPL(hv_is_hibernation_supported);
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 0becb7d..1cb4001 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -166,9 +166,11 @@ static inline int cpumask_to_vpset(struct hv_vpset *vpset,
void hyperv_report_panic(struct pt_regs *regs, long err);
void hyperv_report_panic_msg(phys_addr_t pa, size_t size);
bool hv_is_hyperv_initialized(void);
+bool hv_is_hibernation_supported(void);
void hyperv_cleanup(void);
#else /* CONFIG_HYPERV */
static inline bool hv_is_hyperv_initialized(void) { return false; }
+static inline bool hv_is_hibernation_supported(void) { return false; }
static inline void hyperv_cleanup(void) {}
#endif /* CONFIG_HYPERV */
--
1.8.3.1
next prev parent reply other threads:[~2019-08-20 1:52 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-20 1:51 [PATCH v3 00/12] Enhance the hv_vmbus driver to support hibernation Dexuan Cui
2019-08-20 1:51 ` [PATCH v3 01/12] x86/hyper-v: Suspend/resume the hypercall page for hibernation Dexuan Cui
2019-08-20 1:51 ` Dexuan Cui [this message]
2019-08-23 19:50 ` [PATCH v3 02/12] x86/hyper-v: Implement hv_is_hibernation_supported() Michael Kelley
2019-08-30 23:37 ` Dexuan Cui
2019-08-20 1:52 ` [PATCH v3 03/12] clocksource/drivers: Suspend/resume Hyper-V clocksource for hibernation Dexuan Cui
2019-08-20 1:52 ` [PATCH v3 04/12] Drivers: hv: vmbus: Break out synic enable and disable operations Dexuan Cui
2019-08-20 1:52 ` [PATCH v3 05/12] Drivers: hv: vmbus: Suspend/resume the synic for hibernation Dexuan Cui
2019-08-20 1:52 ` [PATCH v3 06/12] Drivers: hv: vmbus: Add a helper function is_sub_channel() Dexuan Cui
2019-08-23 19:51 ` Michael Kelley
2019-08-20 1:52 ` [PATCH v3 07/12] Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation Dexuan Cui
2019-08-20 1:52 ` [PATCH v3 08/12] Drivers: hv: vmbus: Ignore the offers when resuming from hibernation Dexuan Cui
2019-08-23 19:56 ` Michael Kelley
2019-08-31 0:23 ` Dexuan Cui
2019-08-20 1:52 ` [PATCH v3 09/12] Drivers: hv: vmbus: Suspend/resume the vmbus itself for hibernation Dexuan Cui
2019-08-20 1:52 ` [PATCH v3 10/12] Drivers: hv: vmbus: Clean up hv_sock channels by force upon suspend Dexuan Cui
2019-08-23 20:02 ` Michael Kelley
2019-08-31 2:00 ` Dexuan Cui
2019-08-20 1:52 ` [PATCH v3 11/12] Drivers: hv: vmbus: Suspend after cleaning up hv_sock and sub channels Dexuan Cui
2019-08-23 20:16 ` Michael Kelley
2019-08-31 2:54 ` Dexuan Cui
2019-08-20 1:52 ` [PATCH v3 12/12] Drivers: hv: vmbus: Resume after fixing up old primary channels Dexuan Cui
2019-08-23 20:25 ` Michael Kelley
2019-08-31 4:37 ` Dexuan Cui
2019-08-31 5:08 ` Dexuan Cui
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