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Subject[PATCH v2 3/6] x86/tdx: Add SetupEventNotifyInterrupt TDX hypercall support
Date
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@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
arch/x86/kernel/tdx.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c
index eb3a90051604..fcb0ed70ea19 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
@@ -202,6 +203,30 @@ 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 == TDCALL_INVALID_OPERAND)
+ return -EINVAL;
+
+ return 0;
+}
+
static void tdg_get_info(void)
{
u64 ret;
--
2.25.1
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