From: Michael Kelley <mikelley@microsoft.com>
To: sthemmin@microsoft.com, kys@microsoft.com, wei.liu@kernel.org,
decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de,
linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org
Cc: mikelley@microsoft.com, linux-arch@vger.kernel.org
Subject: [PATCH v2 2/3] Drivers: hv: Add arch independent default functions for some Hyper-V handlers
Date: Wed, 14 Jul 2021 11:34:46 -0700 [thread overview]
Message-ID: <1626287687-2045-3-git-send-email-mikelley@microsoft.com> (raw)
In-Reply-To: <1626287687-2045-1-git-send-email-mikelley@microsoft.com>
Architecture independent Hyper-V code calls various arch-specific handlers
when needed. To aid in supporting multiple architectures, provide weak
defaults that can be overridden by arch-specific implementations where
appropriate. But when arch-specific overrides aren't needed or haven't
been implemented yet for a particular architecture, these stubs reduce
the amount of clutter under arch/.
No functional change.
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
---
arch/x86/hyperv/hv_init.c | 2 --
arch/x86/kernel/cpu/mshyperv.c | 6 ------
drivers/hv/hv_common.c | 49 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 49 insertions(+), 8 deletions(-)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 5cc0c0f..e87a029 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -468,7 +468,6 @@ void hyperv_cleanup(void)
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);
}
-EXPORT_SYMBOL_GPL(hyperv_cleanup);
void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die)
{
@@ -542,4 +541,3 @@ bool hv_is_isolation_supported(void)
{
return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE;
}
-EXPORT_SYMBOL_GPL(hv_is_isolation_supported);
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 4e78643..4e1491c 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -62,14 +62,12 @@ void hv_setup_vmbus_handler(void (*handler)(void))
{
vmbus_handler = handler;
}
-EXPORT_SYMBOL_GPL(hv_setup_vmbus_handler);
void hv_remove_vmbus_handler(void)
{
/* We have no way to deallocate the interrupt gate */
vmbus_handler = NULL;
}
-EXPORT_SYMBOL_GPL(hv_remove_vmbus_handler);
/*
* Routines to do per-architecture handling of stimer0
@@ -104,25 +102,21 @@ void hv_setup_kexec_handler(void (*handler)(void))
{
hv_kexec_handler = handler;
}
-EXPORT_SYMBOL_GPL(hv_setup_kexec_handler);
void hv_remove_kexec_handler(void)
{
hv_kexec_handler = NULL;
}
-EXPORT_SYMBOL_GPL(hv_remove_kexec_handler);
void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs))
{
hv_crash_handler = handler;
}
-EXPORT_SYMBOL_GPL(hv_setup_crash_handler);
void hv_remove_crash_handler(void)
{
hv_crash_handler = NULL;
}
-EXPORT_SYMBOL_GPL(hv_remove_crash_handler);
#ifdef CONFIG_KEXEC_CORE
static void hv_machine_shutdown(void)
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index e836002b..fe333f4 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -16,6 +16,7 @@
#include <linux/export.h>
#include <linux/bitfield.h>
#include <linux/cpumask.h>
+#include <linux/ptrace.h>
#include <linux/slab.h>
#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
@@ -202,3 +203,51 @@ bool hv_query_ext_cap(u64 cap_query)
return hv_extended_cap & cap_query;
}
EXPORT_SYMBOL_GPL(hv_query_ext_cap);
+
+/* 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
+ * them unimplemented and not be cluttered with a bunch of stub
+ * functions in arch-specific code.
+ */
+
+bool __weak hv_is_isolation_supported(void)
+{
+ return false;
+}
+EXPORT_SYMBOL_GPL(hv_is_isolation_supported);
+
+void __weak hv_setup_vmbus_handler(void (*handler)(void))
+{
+}
+EXPORT_SYMBOL_GPL(hv_setup_vmbus_handler);
+
+void __weak hv_remove_vmbus_handler(void)
+{
+}
+EXPORT_SYMBOL_GPL(hv_remove_vmbus_handler);
+
+void __weak hv_setup_kexec_handler(void (*handler)(void))
+{
+}
+EXPORT_SYMBOL_GPL(hv_setup_kexec_handler);
+
+void __weak hv_remove_kexec_handler(void)
+{
+}
+EXPORT_SYMBOL_GPL(hv_remove_kexec_handler);
+
+void __weak hv_setup_crash_handler(void (*handler)(struct pt_regs *regs))
+{
+}
+EXPORT_SYMBOL_GPL(hv_setup_crash_handler);
+
+void __weak hv_remove_crash_handler(void)
+{
+}
+EXPORT_SYMBOL_GPL(hv_remove_crash_handler);
+
+void __weak hyperv_cleanup(void)
+{
+}
+EXPORT_SYMBOL_GPL(hyperv_cleanup);
--
1.8.3.1
next prev parent reply other threads:[~2021-07-14 18:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-14 18:34 [PATCH v2 0/3] Additional refactoring of Hyper-V arch specific code Michael Kelley
2021-07-14 18:34 ` [PATCH v2 1/3] Drivers: hv: Make portions of Hyper-V init code be arch neutral Michael Kelley
2021-07-14 18:34 ` Michael Kelley [this message]
2021-07-14 18:34 ` [PATCH v2 3/3] Drivers: hv: Move Hyper-V misc functionality to arch-neutral code Michael Kelley
2021-07-15 13:03 ` [PATCH v2 0/3] Additional refactoring of Hyper-V arch specific code Wei Liu
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