On Mon, May 11, 2026 at 07:12:40PM -0700, Mukesh R wrote:
> 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.
>
Reviewed-by: Souradeep Chakrabarti <[email protected]>
> Signed-off-by: Mukesh R <[email protected]>
> ---
> 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
>
