whpx: i386: indirect access to CRs

Signed-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>
Link: https://lore.kernel.org/r/20260324151323.74473-10-mohamed@unpredictable.fr
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c
index b97dc9fd514419f631596e7b5f7cb96bae63b7c5..71b33a632acc3812cfc6879dc78b064a18d6763f 100644 (file)
--- a/target/i386/whpx/whpx-all.c
+++ b/target/i386/whpx/whpx-all.c
@@ -905,12 +905,42 @@ static bool is_user_mode(CPUState *cpu)
     return vcpu->exit_ctx.VpContext.ExecutionState.Cpl == 3;
 }
 
+static target_ulong read_cr(CPUState *cpu, int cr)
+{
+    WHV_REGISTER_NAME whv_cr;
+    WHV_REGISTER_VALUE val;
+
+    switch (cr) {
+    case 0:
+        whv_cr = WHvX64RegisterCr0;
+        break;
+    case 2:
+        whv_cr = WHvX64RegisterCr2;
+        break;
+    case 3:
+        whv_cr = WHvX64RegisterCr3;
+        break;
+    case 4:
+        whv_cr = WHvX64RegisterCr4;
+        break;
+    case 8:
+        whv_cr = WHvX64RegisterCr8;
+        break;
+    default:
+        abort();
+    }
+    whpx_get_reg(cpu, whv_cr, &val);
+
+    return val.Reg64;
+}
+
 static const struct x86_emul_ops whpx_x86_emul_ops = {
     .read_segment_descriptor = read_segment_descriptor,
     .handle_io = handle_io,
     .is_protected_mode = is_protected_mode,
     .is_long_mode = is_long_mode,
-    .is_user_mode = is_user_mode
+    .is_user_mode = is_user_mode,
+    .read_cr = read_cr
 };
 
 static void whpx_init_emu(void)