On Tue, Apr 28, 2026 at 04:50:50PM +0300, Doru Blânzeanu wrote:
> Define the `hv_vp_register_page` structure that the linux kernel uses
> to allow access to vcpu registers.
>
> This structure is going to be used in later patches to access vcpu
> registers.
>
> Signed-off-by: Doru Blânzeanu <[email protected]>
> ---
> include/hw/hyperv/hvgdk_mini.h | 103 +++++++++++++++++++++++++++++++++
> 1 file changed, 103 insertions(+)
>
> diff --git a/include/hw/hyperv/hvgdk_mini.h b/include/hw/hyperv/hvgdk_mini.h
In the kernel and the mshv crates the definitions are in hvhdk.h. We
probably want to put it into the same header in QEMU to avoid confusion.
> index c3a8f33280..07e322865a 100644
> --- a/include/hw/hyperv/hvgdk_mini.h
> +++ b/include/hw/hyperv/hvgdk_mini.h
> @@ -474,6 +474,109 @@ struct hv_input_assert_virtual_interrupt {
> uint16_t rsvd_z1;
> } QEMU_PACKED;
>
> +/* Flags for dirty mask of hv_vp_register_page */
> +enum hv_x64_register_class_type {
> + HV_X64_REGISTER_CLASS_GENERAL = 0,
> + HV_X64_REGISTER_CLASS_IP = 1,
> + HV_X64_REGISTER_CLASS_XMM = 2,
> + HV_X64_REGISTER_CLASS_SEGMENT = 3,
> + HV_X64_REGISTER_CLASS_FLAGS = 4,
> +};
> +
> +#define HV_VP_REGISTER_PAGE_MAX_VECTOR_COUNT 7
> +
> +union hv_vp_register_page_interrupt_vectors {
> + uint64_t as_uint64;
> + struct {
> + uint8_t vector_count;
> + uint8_t vector[HV_VP_REGISTER_PAGE_MAX_VECTOR_COUNT];
> + };
> +};
> +
> +struct hv_vp_register_page {
> + uint16_t version;
> + uint8_t isvalid;
> + uint8_t rsvdz;
> + uint32_t dirty;
> +
> + union {
> + struct {
> + /* General purpose registers (HV_X64_REGISTER_CLASS_GENERAL) */
> + union {
> + struct {
> + uint64_t rax;
> + uint64_t rcx;
> + uint64_t rdx;
> + uint64_t rbx;
> + uint64_t rsp;
> + uint64_t rbp;
> + uint64_t rsi;
> + uint64_t rdi;
> + uint64_t r8;
> + uint64_t r9;
> + uint64_t r10;
> + uint64_t r11;
> + uint64_t r12;
> + uint64_t r13;
> + uint64_t r14;
> + uint64_t r15;
> + } QEMU_PACKED;
> +
> + uint64_t gp_registers[16];
> + };
> + /* Instruction pointer (HV_X64_REGISTER_CLASS_IP) */
> + uint64_t rip;
> + /* Flags (HV_X64_REGISTER_CLASS_FLAGS) */
> + uint64_t rflags;
> + } QEMU_PACKED;
> +
> + uint64_t registers[18];
> + };
> + uint8_t reserved[8];
> + /* Volatile XMM registers (HV_X64_REGISTER_CLASS_XMM) */
> + union {
> + struct {
> + struct hv_u128 xmm0;
> + struct hv_u128 xmm1;
> + struct hv_u128 xmm2;
> + struct hv_u128 xmm3;
> + struct hv_u128 xmm4;
> + struct hv_u128 xmm5;
> + } QEMU_PACKED;
> +
> + struct hv_u128 xmm_registers[6];
> + };
> + /* Segment registers (HV_X64_REGISTER_CLASS_SEGMENT) */
> + union {
> + struct {
> + struct hv_x64_segment_register es;
> + struct hv_x64_segment_register cs;
> + struct hv_x64_segment_register ss;
> + struct hv_x64_segment_register ds;
> + struct hv_x64_segment_register fs;
> + struct hv_x64_segment_register gs;
> + } QEMU_PACKED;
> +
> + struct hv_x64_segment_register segment_registers[6];
> + };
> + /* Misc. control registers (cannot be set via this interface) */
> + uint64_t cr0;
> + uint64_t cr3;
> + uint64_t cr4;
> + uint64_t cr8;
> + uint64_t efer;
> + uint64_t dr7;
> + union hv_x64_pending_interruption_register pending_interruption;
> + union hv_x64_interrupt_state_register interrupt_state;
> + uint64_t instruction_emulation_hints;
> + uint64_t xfem;
> +
> + uint8_t reserved1[0x100];
> +
> + /* Interrupts injected as part of HvCallDispatchVp. */
> + union hv_vp_register_page_interrupt_vectors interrupt_vectors;
> +} QEMU_PACKED;
> +
> /* /dev/mshv */
> #define MSHV_CREATE_PARTITION _IOW(MSHV_IOCTL, 0x00, struct
> mshv_create_partition)
> #define MSHV_CREATE_VP _IOW(MSHV_IOCTL, 0x01, struct mshv_create_vp)
> --
> 2.53.0
