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54 lines
1.6 KiB
54 lines
1.6 KiB
From 5000cd48f33e3e4d31cdeda0751188794f8bebf4 Mon Sep 17 00:00:00 2001
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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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Date: Thu, 8 Dec 2011 17:34:58 +0800
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Subject: xen/acpi/sleep: Register to the acpi_suspend_lowlevel a callback.
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We piggyback on "x86/acpi: Provide registration for acpi_suspend_lowlevel."
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to register a Xen version of the callback. The callback does not
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do anything special - except it omits the x86_acpi_suspend_lowlevel.
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It does that b/c during suspend it tries to save cr8 values (which
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the hypervisor does not support), and then on resume path the
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cr3, cr8, idt, and gdt are all resumed which clashes with what
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the hypervisor has set up for the guest.
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Signed-off-by: Liang Tang <liang.tang@oracle.com>
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Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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---
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include/xen/acpi.h | 16 +++++++++++++++-
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1 files changed, 15 insertions(+), 1 deletions(-)
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diff --git a/include/xen/acpi.h b/include/xen/acpi.h
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index 48a9c01..ebaabbb 100644
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--- a/include/xen/acpi.h
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+++ b/include/xen/acpi.h
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@@ -43,11 +43,25 @@
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int xen_acpi_notify_hypervisor_state(u8 sleep_state,
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u32 pm1a_cnt, u32 pm1b_cnd);
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+static inline int xen_acpi_suspend_lowlevel(void)
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+{
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+ /*
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+ * Xen will save and restore CPU context, so
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+ * we can skip that and just go straight to
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+ * the suspend.
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+ */
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+ acpi_enter_sleep_state(ACPI_STATE_S3);
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+ return 0;
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+}
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+
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static inline void xen_acpi_sleep_register(void)
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{
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- if (xen_initial_domain())
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+ if (xen_initial_domain()) {
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acpi_os_set_prepare_sleep(
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&xen_acpi_notify_hypervisor_state);
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+
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+ acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel;
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+ }
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}
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#else
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static inline void xen_acpi_sleep_register(void)
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--
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1.7.6.4
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