Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Saurabh Sengar <ssengar@linux.microsoft.com>
To:     ssengar@microsoft.com, kys@microsoft.com, haiyangz@microsoft.com,
        wei.liu@kernel.org, decui@microsoft.com,
        ssengar@linux.microsoft.com, linux-hyperv@vger.kernel.org,
        linux-kernel@vger.kernel.org, mikelley@microsoft.com,
        tglx@linutronix.de, bp@alien8.de, dave.hansen@linux.intel.com,
        x86@kernel.org, hpa@zytor.com, anrayabh@linux.microsoft.com
Subject: [PATCH v2] x86/Hyper-V: Expand definition of struct hv_vp_assist_page
Date:   Fri,  4 Nov 2022 11:38:43 -0700
Message-Id: <1667587123-31645-1-git-send-email-ssengar@linux.microsoft.com>
Precedence: bulk

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@linux.microsoft.com>
---
[v2]: Corrected vtl_entry_reson size from u8 to u32

 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 3089ec3..6d9368e 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -374,11 +374,20 @@ struct hv_nested_enlightenments_control {
 struct hv_vp_assist_page {
 	__u32 apic_assist;
 	__u32 reserved1;
-	__u64 vtl_control[3];
+	__u32 vtl_entry_reason;
+	__u32 vtl_reserved;
+	__u64 vtl_ret_x64rax;
+	__u64 vtl_ret_x64rcx;
 	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 {
-- 
1.8.3.1