The commit is pushed to "branch-rh7-3.10.0-693.21.1.vz7.47.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-693.21.1.vz7.47.5
------>
commit 8cec53c42f5cafea177a7402e9cbf51e4dda9b87
Author: Liran Alon <[email protected]>
Date: Tue May 8 12:26:23 2018 +0300
ms/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: Liran Alon <[email protected]>
Reviewed-by: Nikita Leshenko <[email protected]>
Reviewed-by: Radim KrÄmáŠ<[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
(cherry picked from commit 9a29d449e3fb704bd449b82b2160a041709a5425)
Signed-off-by: Jan Dakinevich <[email protected]>
---
arch/x86/kvm/emulate.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index dba1746c539c..7d486946d09c 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2907,6 +2907,9 @@ 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)
{
@@ -2918,6 +2921,14 @@ 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;
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