[v3,2/7] KVM: x86: Always allow access to VMware backdoor I/O ports

Commit Message

Liran Alon March 12, 2018, 11:12 a.m. UTC

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

Signed-off-by: Liran Alon <[e-mail]>
Reviewed-by: Nikita Leshenko <[e-mail]>
Signed-off-by: Krish Sadhukhan <[e-mail]>
---
 arch/x86/kvm/emulate.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

Patch

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index d91eaeb01034..821f6335cbcb 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -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;