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[PATCH v7 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

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  [PATCH v7 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs jakeo@microsoft.com - 2015-12-05 01:40 +0100
    [PATCH v7 6/7] drivers:hv: Define the channel type of Hyper-V PCI Express pass-through jakeo@microsoft.com - 2015-12-05 01:40 +0100
    [PATCH v7 2/7] drivers:hv: Export hv_do_hypercall() jakeo@microsoft.com - 2015-12-05 01:40 +0100
    Re: [PATCH v7 7/7] PCI: hv: New paravirtual PCI front-end for Hyper-V  VMs Thomas Gleixner <tglx@linutronix.de> - 2015-12-08 22:00 +0100

#1284400 — [PATCH v7 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

From: Jake Oshins <jakeo@microsoft.com>

This version of the patch series incorporates feedback from Gerry Liu.

First, export functions that allow correlating Hyper-V virtual processors
and Linux cpus, along with the means for invoking a hypercall that targets
interrupts at chosen vectors on specific cpus.

Second, mark various parts of IRQ domain related code as exported, so that
this PCI front-end can implement an IRQ domain as part of a module.  (The
alternative would be to pull all tyhis into the kernel, which would pull
in a lot of other Hyper-V related code, as this IRQ domain depends on
vmbus.ko.)

Third, modify PCI so that new root PCI buses can be marked with an associated
fwnode_handle, and so that root PCI buses can look up their associated IRQ
domain by that handle.

Fourth, introduce a new driver, hv_pcifront, which exposes root PCI buses in
a Hyper-V VM.  These root PCI buses expose real PCIe device, or PCI Virtual
Functions.

Jake Oshins (7):
  drivers:hv: Export a function that maps Linux CPU num onto Hyper-V
    proc num
  drivers:hv: Export hv_do_hypercall()
  PCI: Make it possible to implement a PCI MSI IRQ Domain in a module.
  PCI: Add fwnode_handle to pci_sysdata
  PCI: irqdomain: Look up IRQ domain by fwnode_handle
  drivers:hv: Define the channel type of Hyper-V PCI Express
    pass-through
  PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

 MAINTAINERS                    |    1 +
 arch/x86/include/asm/msi.h     |    6 +
 arch/x86/include/asm/pci.h     |   15 +
 arch/x86/kernel/apic/msi.c     |    8 +-
 arch/x86/kernel/apic/vector.c  |    2 +
 drivers/hv/hv.c                |   20 +-
 drivers/hv/hyperv_vmbus.h      |    2 +-
 drivers/hv/vmbus_drv.c         |   17 +
 drivers/pci/Kconfig            |    7 +
 drivers/pci/host/Makefile      |    1 +
 drivers/pci/host/hv_pcifront.c | 2241 ++++++++++++++++++++++++++++++++++++++++
 drivers/pci/msi.c              |    4 +
 drivers/pci/probe.c            |   14 +
 include/asm-generic/pci.h      |    4 +
 include/linux/hyperv.h         |   14 +
 kernel/irq/chip.c              |    1 +
 kernel/irq/irqdomain.c         |    4 +
 17 files changed, 2347 insertions(+), 14 deletions(-)
 create mode 100644 drivers/pci/host/hv_pcifront.c

-- 
1.9.1

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#1284402 — [PATCH v7 6/7] drivers:hv: Define the channel type of Hyper-V PCI Express pass-through

From: Jake Oshins <jakeo@microsoft.com>

This defines the channel type for PCI front-ends in Hyper-V VMs.

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
---
 include/linux/hyperv.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 24d0b65..c9a9eed 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1141,6 +1141,17 @@ u64 hv_do_hypercall(u64 control, void *input, void *output);
 		}
 
 /*
+ * PCI Express Pass Through
+ * {44C4F61D-4444-4400-9D52-802E27EDE19F}
+ */
+
+#define HV_PCIE_GUID \
+	.guid = { \
+			0x1D, 0xF6, 0xC4, 0x44, 0x44, 0x44, 0x00, 0x44, \
+			0x9D, 0x52, 0x80, 0x2E, 0x27, 0xED, 0xE1, 0x9F \
+		}
+
+/*
  * Common header for Hyper-V ICs
  */
 
-- 
1.9.1

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#1284403 — [PATCH v7 2/7] drivers:hv: Export hv_do_hypercall()

From: Jake Oshins <jakeo@microsoft.com>

This patch exposes the function that hv_vmbus.ko uses to make hypercalls.
This is necessary for retargeting an interrupt when it is given a new
affinity and vector.

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
---
 drivers/hv/hv.c           | 20 ++++++++++----------
 drivers/hv/hyperv_vmbus.h |  2 +-
 include/linux/hyperv.h    |  1 +
 3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 6341be8..7a06933 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -89,9 +89,9 @@ static int query_hypervisor_info(void)
 }
 
 /*
- * do_hypercall- Invoke the specified hypercall
+ * hv_do_hypercall- Invoke the specified hypercall
  */
-static u64 do_hypercall(u64 control, void *input, void *output)
+u64 hv_do_hypercall(u64 control, void *input, void *output)
 {
 	u64 input_address = (input) ? virt_to_phys(input) : 0;
 	u64 output_address = (output) ? virt_to_phys(output) : 0;
@@ -132,6 +132,7 @@ static u64 do_hypercall(u64 control, void *input, void *output)
 	return hv_status_lo | ((u64)hv_status_hi << 32);
 #endif /* !x86_64 */
 }
+EXPORT_SYMBOL_GPL(hv_do_hypercall);
 
 #ifdef CONFIG_X86_64
 static cycle_t read_hv_clock_tsc(struct clocksource *arg)
@@ -315,7 +316,7 @@ int hv_post_message(union hv_connection_id connection_id,
 {
 
 	struct hv_input_post_message *aligned_msg;
-	u16 status;
+	u64 status;
 
 	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
 		return -EMSGSIZE;
@@ -329,11 +330,10 @@ int hv_post_message(union hv_connection_id connection_id,
 	aligned_msg->payload_size = payload_size;
 	memcpy((void *)aligned_msg->payload, payload, payload_size);
 
-	status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
-		& 0xFFFF;
+	status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
 
 	put_cpu();
-	return status;
+	return status & 0xFFFF;
 }
 
 
@@ -343,13 +343,13 @@ int hv_post_message(union hv_connection_id connection_id,
  *
  * This involves a hypercall.
  */
-u16 hv_signal_event(void *con_id)
+int hv_signal_event(void *con_id)
 {
-	u16 status;
+	u64 status;
 
-	status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);
+	status = hv_do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL);
 
-	return status;
+	return status & 0xFFFF;
 }
 
 static int hv_ce_set_next_event(unsigned long delta,
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 3782636..cc2fb53 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -582,7 +582,7 @@ extern int hv_post_message(union hv_connection_id connection_id,
 			 enum hv_message_type message_type,
 			 void *payload, size_t payload_size);
 
-extern u16 hv_signal_event(void *con_id);
+extern int hv_signal_event(void *con_id);
 
 extern int hv_synic_alloc(void);
 
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index fddb3e0..24d0b65 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -984,6 +984,7 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
 			bool fb_overlap_ok);
 
 int vmbus_cpu_number_to_vp_number(int cpu_number);
+u64 hv_do_hypercall(u64 control, void *input, void *output);
 
 /**
  * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
-- 
1.9.1

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#1286846 — Re: [PATCH v7 7/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

On Sat, 5 Dec 2015, jakeo@microsoft.com wrote:

> From: Jake Oshins <jakeo@microsoft.com>
> 
> This patch introduces a new driver which exposes a root PCI bus whenever a
> PCI Express device is passed through to a guest VM under Hyper-V. The
> device can be single- or multi-function. The interrupts for the devices
> are managed by an IRQ domain, implemented within the driver.
> 
> Signed-off-by: Jake Oshins <jakeo@microsoft.com>

For the irq related parts of this:

    Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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