[v7,26/52] i386/tdx: Enable user exit on KVM_HC_MAP_GPA_RANGE

Commit Message

Xiaoyao Li Jan. 24, 2025, 1:20 p.m. UTC

KVM translates TDG.VP.VMCALL<MapGPA> to KVM_HC_MAP_GPA_RANGE, and QEMU
needs to enable user exit on KVM_HC_MAP_GPA_RANGE in order to handle the
memory conversion requested by TD guest.

Signed-off-by: Xiaoyao Li <[e-mail]>
---
changes in v6:
 - new patch;
---
 target/i386/kvm/tdx.c | 7 +++++++
 1 file changed, 7 insertions(+)

Patch

diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index d7f7f8301ca2..1d0cf29c39f9 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -19,6 +19,8 @@ 
 #include "system/system.h"
 #include "exec/ramblock.h"
 
+#include <linux/kvm_para.h>
+
 #include "hw/i386/e820_memory_layout.h"
 #include "hw/i386/x86.h"
 #include "hw/i386/tdvf.h"
@@ -374,6 +376,11 @@  static int tdx_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
         }
     }
 
+    /* TDX relies on KVM_HC_MAP_GPA_RANGE to handle TDG.VP.VMCALL<MapGPA> */
+    if (!kvm_enable_hypercall(BIT_ULL(KVM_HC_MAP_GPA_RANGE))) {
+        return -EOPNOTSUPP;
+    }
+
     qemu_add_machine_init_done_notifier(&tdx_machine_done_notify);
 
     tdx_guest = tdx;