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Commit 9a29d449 authored by Liran Alon's avatar Liran Alon Committed by Paolo Bonzini
Browse files

KVM: x86: Always allow access to VMware backdoor I/O ports 



VMware allows access to these ports even if denied
by TSS I/O permission bitmap. Mimic behavior.

Signed-off-by: default avatarLiran Alon <liran.alon@oracle.com>
Reviewed-by: default avatarNikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent c4ae60e4

arch/x86/kvm/emulate.c

+11 −0
Original line number Diff line number Diff line
@@ -2887,6 +2887,9 @@ static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt) 
	return ctxt->ops->cpl(ctxt) > iopl;

}



#define VMWARE_PORT_VMPORT	(0x5658)

#define VMWARE_PORT_VMRPC	(0x5659)



static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt,

					    u16 port, u16 len)

{
@@ -2898,6 +2901,14 @@ static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt, 
	unsigned mask = (1 << len) - 1;

	unsigned long base;



	/*

	 * VMware allows access to these ports even if denied

	 * by TSS I/O permission bitmap. Mimic behavior.

	 */

	if (enable_vmware_backdoor &&

	    ((port == VMWARE_PORT_VMPORT) || (port == VMWARE_PORT_VMRPC)))

		return true;



	ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR);

	if (!tr_seg.p)

		return false;