On Thu, Nov 03, 2022 at 09:56:54PM -0700, Saurabh Sengar wrote:
> The struct hv_vp_assist_page has 24 bytes which is defined as u64[3],
> expand that to expose vtl_entry_reason, vtl_ret_x64rax and vtl_ret_x64rcx
> field. vtl_entry_reason is updated by hypervisor for the entry reason as
> to why the VTL was entered on the virtual processor.
> Guest updates the vtl_ret_* fields to provide the register values to
> restore on VTL return. The specific register values that are restored
> which will be updated on vtl_ret_x64rax and vtl_ret_x64rcx.
> Also added the missing fields for synthetic_time_unhalted_timer_expired,
> virtualization_fault_information and intercept_message.
>
> Signed-off-by: Saurabh Sengar <ssengar@xxxxxxxxxxxxxxxxxxx>
> ---
> arch/x86/include/asm/hyperv-tlfs.h | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
> index f769b9db4630..b3d0f42853d2 100644
> --- a/arch/x86/include/asm/hyperv-tlfs.h
> +++ b/arch/x86/include/asm/hyperv-tlfs.h
> @@ -377,11 +377,20 @@ struct hv_nested_enlightenments_control {
> struct hv_vp_assist_page {
> __u32 apic_assist;
> __u32 reserved1;
> - __u64 vtl_control[3];
> + __u8 vtl_entry_reason;
This is defined as an enum in the TLFS [1]. We should do the same.
And since the TLFS defines it as an enum it is a 32 bit value and
not a u8.
> + __u8 vtl_reserved[7];
> + __u64 vtl_ret_x64rax;
> + __u64 vtl_ret_x64rcx;
The TLFS groups the above VTL related fields into a struct
HV_VP_VTL_CONTROL. Any reason to not do the same?
[1] https://learn.microsoft.com/en-us/virtualization/hyper-v-on-windows/tlfs/datatypes/hv_vp_vtl_control
Thanks,
Anirudh.
> struct hv_nested_enlightenments_control nested_control;
> __u8 enlighten_vmentry;
> __u8 reserved2[7];
> __u64 current_nested_vmcs;
> + __u8 synthetic_time_unhalted_timer_expired;
> + __u8 reserved3[7];
> + __u8 virtualization_fault_information[40];
> + __u8 reserved4[8];
> + __u8 intercept_message[256];
> + __u8 vtl_ret_actions[256];
> } __packed;
>
> struct hv_enlightened_vmcs {
> --
> 2.34.1
