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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 <liran.alon@oracle.com>
Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liran Alon 2018-03-12 13:12:48 +02:00 committed by Paolo Bonzini
parent c4ae60e4bb
commit 9a29d449e3
1 changed files with 11 additions and 0 deletions
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11
arch/x86/kvm/emulate.c
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@ -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;