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From: jakeo@microsoft.com
To: gregkh@linuxfoundation.org, kys@microsoft.com,
	linux-kernel@vger.kernel.org, devel@linuxdriverproject.org,
	olaf@aepfle.de, apw@canonical.com, vkuznets@redhat.com,
	linux-pci@vger.kernel.org, bhelgaas@google.com,
	mebersol@microsoft.com, haiyangz@microsoft.com
Cc: Jake Oshins <jakeo@microsoft.com>
Subject: [PATCH 3/6] arch:x86:hv: Add mechanism for Hyper-V paravirt drivers to hook msi message creation
Date: Thu, 11 Jun 2015 16:22:24 +0000	[thread overview]
Message-ID: <1434039747-44535-4-git-send-email-jakeo@microsoft.com> (raw)
In-Reply-To: <1434039747-44535-1-git-send-email-jakeo@microsoft.com>

From: Jake Oshins <jakeo@microsoft.com>

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
---
 arch/x86/include/asm/mshyperv.h |  2 ++
 arch/x86/kernel/cpu/mshyperv.c  | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index c163215..bf7789e 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -19,5 +19,7 @@ void hyperv_callback_vector(void);
 void hyperv_vector_handler(struct pt_regs *regs);
 void hv_setup_vmbus_irq(void (*handler)(void));
 void hv_remove_vmbus_irq(void);
+void hyperv_install_interrupt_translation(struct x86_msi_ops *new_ops);
+void hyperv_uninstall_interrupt_translation(void);
 
 #endif
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 939155f..816e329 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -69,6 +69,36 @@ void hv_remove_vmbus_irq(void)
 }
 EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq);
 EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq);
+
+struct x86_msi_ops old_msi_ops;
+
+void hyperv_install_interrupt_translation(struct x86_msi_ops *new_ops)
+{
+	old_msi_ops.setup_msi_irqs = xchg(&(x86_msi.setup_msi_irqs),
+					  new_ops->setup_msi_irqs);
+	old_msi_ops.compose_msi_msg = xchg(&(x86_msi.compose_msi_msg),
+					   new_ops->compose_msi_msg);
+	old_msi_ops.teardown_msi_irqs = xchg(&(x86_msi.teardown_msi_irqs),
+					     new_ops->teardown_msi_irqs);
+	old_msi_ops.restore_msi_irqs = xchg(&(x86_msi.restore_msi_irqs),
+					    new_ops->restore_msi_irqs);
+
+	new_ops->setup_msi_irqs = old_msi_ops.setup_msi_irqs;
+	new_ops->compose_msi_msg = old_msi_ops.compose_msi_msg;
+	new_ops->teardown_msi_irqs = old_msi_ops.teardown_msi_irqs;
+	new_ops->restore_msi_irqs = old_msi_ops.restore_msi_irqs;
+}
+EXPORT_SYMBOL_GPL(hyperv_install_interrupt_translation);
+
+void hyperv_uninstall_interrupt_translation(void)
+{
+	xchg(&(x86_msi.setup_msi_irqs), old_msi_ops.setup_msi_irqs);
+	xchg(&(x86_msi.compose_msi_msg), old_msi_ops.compose_msi_msg);
+	xchg(&(x86_msi.teardown_msi_irqs), old_msi_ops.teardown_msi_irqs);
+	xchg(&(x86_msi.restore_msi_irqs), old_msi_ops.restore_msi_irqs);
+}
+EXPORT_SYMBOL_GPL(hyperv_uninstall_interrupt_translation);
+
 #endif
 
 static uint32_t  __init ms_hyperv_platform(void)
-- 
1.9.1


  parent reply	other threads:[~2015-06-11 16:22 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-11 16:22 [PATCH 0/6] Front-end driver for PCIe Pass-through on Hyper-V jakeo
2015-06-11 16:22 ` [PATCH 1/6] drivers:hv: Modify vmbus to search for all MMIO ranges available jakeo
2015-06-11 16:22 ` [PATCH 2/6] drivers:hv: Move MMIO range picking from hyper_fb.mod to hv_vmbus.mod jakeo
2015-06-11 17:46   ` Greg KH
2015-06-11 16:22 ` jakeo [this message]
2015-06-11 16:22 ` [PATCH 4/6] drivers:hv: Export a function that maps Linux proc num onto Hyper-V proc num jakeo
2015-06-11 16:22 ` [PATCH 5/6] drivers:hv: Define the channel type for Hyper-V PCI Express pass-through jakeo
2015-06-11 16:22 ` [PATCH 6/6] drivers:pci:hv: New paravirtual PCI front-end for Hyper-V VMs jakeo
2015-06-11 17:46   ` Greg KH
2015-06-12  8:44   ` Paul Bolle
2015-06-12 15:11     ` Jake Oshins
2015-06-12 16:14       ` gregkh
2015-06-11 17:47 ` [PATCH 0/6] Front-end driver for PCIe Pass-through on Hyper-V Greg KH

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