SetupEventNotifyInterrupt TDX hypercall is used by guest TD to specify
which interrupt vector to use as an event-notify vector to the VMM.
Such registered vector is also used by Host VMM to notify about
completion of GetQuote requests to the Guest TD.
Add tdx_hcall_set_notify_intr() helper function to implement the
SetupEventNotifyInterrupt hypercall.
This will be used by the TD quote driver.
Details about the SetupEventNotifyInterrupt TDVMCALL can be found in
TDX Guest-Host Communication Interface (GHCI) Specification, sec 3.5
"TDG.VP.VMCALL<SetupEventNotifyInterrupt>".
Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
---
Change since v2:
* Included TDVMCALL_SUCCESS case check in tdx_hcall_set_notify_intr().
arch/x86/kernel/tdx.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c
index aa49c6809a0c..27e56ab0d4a2 100644
--- a/arch/x86/kernel/tdx.c
+++ b/arch/x86/kernel/tdx.c
@@ -29,6 +29,7 @@
/* TDX hypercall Leaf IDs */
#define TDVMCALL_MAP_GPA 0x10001
#define TDVMCALL_GET_QUOTE 0x10002
+#define TDVMCALL_SETUP_NOTIFY_INTR 0x10004
/* TDX Module call error codes */
#define TDX_PAGE_ALREADY_ACCEPTED 0x8000000000000001
@@ -208,6 +209,32 @@ int tdx_hcall_get_quote(u64 data)
}
EXPORT_SYMBOL_GPL(tdx_hcall_get_quote);
+/*
+ * tdx_hcall_set_notify_intr() - Setup Event Notify Interrupt Vector.
+ *
+ * @vector : Vector address to be used for notification.
+ *
+ * return 0 on success or failure error number.
+ */
+int tdx_hcall_set_notify_intr(u8 vector)
+{
+ u64 ret;
+
+ /* Minimum vector value allowed is 32 */
+ if (vector < 32)
+ return -EINVAL;
+
+ ret = _trace_tdx_hypercall(TDVMCALL_SETUP_NOTIFY_INTR, vector, 0, 0, 0,
+ NULL);
+
+ if (ret == TDVMCALL_SUCCESS)
+ return 0;
+ else if (ret == TDCALL_INVALID_OPERAND)
+ return -EINVAL;
+
+ return -EIO;
+}
+
static void tdg_get_info(void)
{
u64 ret;
--
2.25.1
