Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7fe864dc authored by Nadav Amit's avatar Nadav Amit Committed by Paolo Bonzini
Browse files

KVM: x86: Mark VEX-prefix instructions emulation as unimplemented 



Currently the emulator does not recognize vex-prefix instructions.  However, it
may incorrectly decode lgdt/lidt instructions and try to execute them. This
patch returns unhandlable error on their emulation.

Signed-off-by: default avatarNadav Amit <namit@cs.technion.ac.il>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 7171511e

arch/x86/kvm/emulate.c

+7 −0
Original line number Diff line number Diff line
@@ -4314,6 +4314,13 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len) 
	if (ctxt->d & ModRM)

		ctxt->modrm = insn_fetch(u8, ctxt);



	/* vex-prefix instructions are not implemented */

	if (ctxt->opcode_len == 1 && (ctxt->b == 0xc5 || ctxt->b == 0xc4) &&

	    (mode == X86EMUL_MODE_PROT64 ||

	    (mode >= X86EMUL_MODE_PROT16 && (ctxt->modrm & 0x80)))) {

		ctxt->d = NotImpl;

	}



	while (ctxt->d & GroupMask) {

		switch (ctxt->d & GroupMask) {

		case Group: