[PATCH v0 1/3] mshv: Import declarations for irq remap and add irqbypass support

[Mukesh R <mrathor@linux.microsoft.com>]

For the irq map/remap hypercalls, copy relevant data structures from
hypervisor public headers into Linux equivalents. Also, update Kconfig and
mshv_irqfd for irqbypass. Please note, irqbypass is required for doing
passthru on MSHV. This because there is really no way of knowing the linux
irq in the mshv_irqfd_assign and mshv_irqfd_update paths without it. The
linux irq is setup upfront by VFIO before irqfd assign/update happens.

Signed-off-by: Mukesh R <mrathor@linux.microsoft.com>
---
 drivers/hv/Kconfig          |  1 +
 drivers/hv/mshv_eventfd.h   |  3 +++
 include/hyperv/hvgdk_mini.h |  3 +++
 include/hyperv/hvhdk.h      | 17 +++++++++++++++++
 4 files changed, 24 insertions(+)

diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 7937ac0cbd0f..c831fe25ca2b 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -75,6 +75,7 @@ config MSHV_ROOT
 	# no particular order, making it impossible to reassemble larger pages
 	depends on PAGE_SIZE_4KB
 	select EVENTFD
+	select IRQ_BYPASS_MANAGER
 	select VIRT_XFER_TO_GUEST_WORK
 	select HMM_MIRROR
 	select MMU_NOTIFIER
diff --git a/drivers/hv/mshv_eventfd.h b/drivers/hv/mshv_eventfd.h
index 464c6b81ab33..ff4dd24b8ad4 100644
--- a/drivers/hv/mshv_eventfd.h
+++ b/drivers/hv/mshv_eventfd.h
@@ -9,6 +9,7 @@
 #define __LINUX_MSHV_EVENTFD_H
 
 #include <linux/poll.h>
+#include <linux/irqbypass.h>
 
 #include "mshv.h"
 #include "mshv_root.h"
@@ -37,6 +38,8 @@ struct mshv_irqfd {
 	struct mshv_irqfd_resampler	    *irqfd_resampler;
 	struct eventfd_ctx		    *irqfd_resamplefd;
 	struct hlist_node		     irqfd_resampler_hnode;
+	struct irq_bypass_consumer	     irqfd_bypass_cons;
+	struct irq_bypass_producer	    *irqfd_bypass_prod;
 };
 
 void mshv_eventfd_init(struct mshv_partition *partition);
diff --git a/include/hyperv/hvgdk_mini.h b/include/hyperv/hvgdk_mini.h
index da622fb06440..1ef480825705 100644
--- a/include/hyperv/hvgdk_mini.h
+++ b/include/hyperv/hvgdk_mini.h
@@ -59,6 +59,8 @@ struct hv_u128 {
 #define HV_PARTITION_ID_INVALID		((u64)0)
 #define HV_PARTITION_ID_SELF		((u64)-1)
 
+#define HV_MAX_VPS    256               /* HV_MAXIMUM_PROCESSORS */
+
 /* Hyper-V specific model specific registers (MSRs) */
 
 #if defined(CONFIG_X86)
@@ -508,6 +510,7 @@ union hv_vp_assist_msr_contents {	 /* HV_REGISTER_VP_ASSIST_PAGE */
 #define HVCALL_UNMAP_VP_STATE_PAGE			0x00e2
 #define HVCALL_GET_VP_STATE				0x00e3
 #define HVCALL_SET_VP_STATE				0x00e4
+#define HVCALL_GET_VPSET_FROM_MDA                       0x00e5
 #define HVCALL_GET_VP_CPUID_VALUES			0x00f4
 #define HVCALL_GET_PARTITION_PROPERTY_EX		0x0101
 #define HVCALL_MMIO_READ				0x0106
diff --git a/include/hyperv/hvhdk.h b/include/hyperv/hvhdk.h
index 5e83d3714966..d0a892347ab1 100644
--- a/include/hyperv/hvhdk.h
+++ b/include/hyperv/hvhdk.h
@@ -952,4 +952,21 @@ struct hv_input_modify_sparse_spa_page_host_access {
 #define HV_MODIFY_SPA_PAGE_HOST_ACCESS_LARGE_PAGE      0x4
 #define HV_MODIFY_SPA_PAGE_HOST_ACCESS_HUGE_PAGE       0x8
 
+#ifdef CONFIG_X86
+
+struct hv_input_get_vp_set_from_mda {   /* HV_OUTPUT_GET_VP_SET_FROM_MDA */
+	u64 target_partid;
+	u64 dest_address;
+	u8  input_vtl;
+	u8  destmode_logical;         /* true => mode is logical */
+	u16 reserved0;                /* mbz */
+	u32 reserved1;                /* mbz */
+} __packed;
+
+union hv_output_get_vp_set_from_mda {  /* HV_OUTPUT_GET_VP_SET_FROM_MDA */
+	struct hv_vpset target_vpset;
+	u64 bitset_buffer[HV_GENERIC_SET_QWORD_COUNT(HV_MAX_VPS)];
+} __packed;
+
+#endif /* CONFIG_X86 */
 #endif /* _HV_HVHDK_H */
-- 
2.51.2.vfs.0.1