Messages in this thread Patch in this message | | | From | Ben Guthro <> | Subject | [PATCH] xen/acpi/sleep: Register to the acpi_suspend_lowlevel a callback. | Date | Tue, 14 May 2013 13:46:12 -0400 |
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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
We piggyback on "x86/acpi: Provide registration for acpi_suspend_lowlevel." to register a Xen version of the callback. The callback does not do anything special - except it omits the x86_acpi_suspend_lowlevel.
This is necessary b/c during suspend the generic code tries to write cr3 values that clashes with what the hypervisor has set up for the guest.
Signed-off-by: Liang Tang <liang.tang@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Tested-by: Ben Guthro <benjamin.guthro@citrix.com> Acked-by: H. Peter Anvin <hpa@linux.intel.com> --- include/xen/acpi.h | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/include/xen/acpi.h b/include/xen/acpi.h index 68d73d0..46aa3d1 100644 --- a/include/xen/acpi.h +++ b/include/xen/acpi.h @@ -78,11 +78,25 @@ static inline int xen_acpi_get_pxm(acpi_handle h) int xen_acpi_notify_hypervisor_state(u8 sleep_state, u32 pm1a_cnt, u32 pm1b_cnd); +static inline int xen_acpi_suspend_lowlevel(void) +{ + /* + * Xen will save and restore CPU context, so + * we can skip that and just go straight to + * the suspend. + */ + acpi_enter_sleep_state(ACPI_STATE_S3); + return 0; +} + static inline void xen_acpi_sleep_register(void) { - if (xen_initial_domain()) + if (xen_initial_domain()) { acpi_os_set_prepare_sleep( &xen_acpi_notify_hypervisor_state); + + acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel; + } } #else static inline void xen_acpi_sleep_register(void) -- 1.7.9.5
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