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[PATCH v2 5/5] vVMX: address size in decode_vmx_inst()
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 17 Jun 2025 18:02:49 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 17 Jun 2025 16:10:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
While the original use of the address size file in the instruction info
provided was wrong, it still wants using: The offset into the designated
segment still may need truncating accordingly.
Fixes: 09fce8016596 ("Nested VMX: Emulation of guest VMXON/OFF instruction")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -453,6 +453,13 @@ static int decode_vmx_inst(struct cpu_us
size = 4 << mode_64bit;
offset = base + index * scale + disp;
+ switch ( info.fields.addr_size )
+ {
+ case 0: offset = (uint16_t)offset; break;
+ case 1: offset = (uint32_t)offset; break;
+ default: break;
+ }
+
base = !mode_64bit || info.fields.segment >= x86_seg_fs ?
seg_base + offset : offset;
if ( offset + size - 1 < offset ||
|
