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| author | Michael Kelley <mikelley@microsoft.com> | 2021-07-14 11:34:47 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-07-15 12:59:45 +0000 |
| commit | 6dc77fa5ac2cf26f846a51492dbe42526e26d0f2 (patch) | |
| tree | 53accb41ffae4921b6eaf92ec7c50ffc62f9d19a /drivers/hv/hv_common.c | |
| parent | 9d7cf2c9675838c12cd5cf5a4ebe2ba41bd78a44 (diff) | |
| download | linux-6dc77fa5ac2cf26f846a51492dbe42526e26d0f2.tar.gz linux-6dc77fa5ac2cf26f846a51492dbe42526e26d0f2.tar.bz2 linux-6dc77fa5ac2cf26f846a51492dbe42526e26d0f2.zip | |
Drivers: hv: Move Hyper-V misc functionality to arch-neutral code
The check for whether hibernation is possible, and the enabling of
Hyper-V panic notification during kexec, are both architecture neutral.
Move the code from under arch/x86 and into drivers/hv/hv_common.c where
it can also be used for ARM64.
No functional change.
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1626287687-2045-4-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hv/hv_common.c')
| -rw-r--r-- | drivers/hv/hv_common.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index fe333f410d1d..46658de78050 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -13,9 +13,11 @@ */ #include <linux/types.h> +#include <linux/acpi.h> #include <linux/export.h> #include <linux/bitfield.h> #include <linux/cpumask.h> +#include <linux/panic_notifier.h> #include <linux/ptrace.h> #include <linux/slab.h> #include <asm/hyperv-tlfs.h> @@ -71,6 +73,16 @@ int __init hv_common_init(void) int i; /* + * Hyper-V expects to get crash register data or kmsg when + * crash enlightment is available and system crashes. Set + * crash_kexec_post_notifiers to be true to make sure that + * calling crash enlightment interface before running kdump + * kernel. + */ + if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) + crash_kexec_post_notifiers = true; + + /* * Allocate the per-CPU state for the hypercall input arg. * If this allocation fails, we will not be able to setup * (per-CPU) hypercall input page and thus this failure is @@ -204,6 +216,12 @@ bool hv_query_ext_cap(u64 cap_query) } EXPORT_SYMBOL_GPL(hv_query_ext_cap); +bool hv_is_hibernation_supported(void) +{ + return !hv_root_partition && acpi_sleep_state_supported(ACPI_STATE_S4); +} +EXPORT_SYMBOL_GPL(hv_is_hibernation_supported); + /* These __weak functions provide default "no-op" behavior and * may be overridden by architecture specific versions. Architectures * for which the default "no-op" behavior is sufficient can leave |