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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2013-05-14 17:46:12 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-06-19 23:36:30 +0200 |
| commit | 068e0dc7b7c1db9801e3d7f2ba5cb1d2a552a35b (patch) | |
| tree | e61ae45516a78c848db96b5cd68452453b0eb2de /include/xen/acpi.h | |
| parent | d6a77ead21b69c395ca6d09a066ededfac601bcc (diff) | |
| download | lwn-068e0dc7b7c1db9801e3d7f2ba5cb1d2a552a35b.tar.gz lwn-068e0dc7b7c1db9801e3d7f2ba5cb1d2a552a35b.zip | |
xen / ACPI / sleep: Register an acpi_suspend_lowlevel callback.
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>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/xen/acpi.h')
| -rw-r--r-- | include/xen/acpi.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/include/xen/acpi.h b/include/xen/acpi.h index 68d73d09b770..46aa3d1c1654 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) |