tree 9f2024d364073ba42a6fed317a5e66dd9999e28d
parent a4083c9271e0a697278e089f2c0b9a95363ada0a
author Avi Kivity <avi@qumranet.com> 1205686106 +0200
committer Avi Kivity <avi@qumranet.com> 1206433336 +0200

KVM: VMX: Restore tss even on x86_64

The vmx hardware state restore restores the tss selector and base address, but
not its length.  Usually, this does not matter since most of the tss contents
is within the default length of 0x67.  However, if a process is using ioperm()
to grant itself I/O port permissions, an additional bitmap within the tss,
but outside the default length is consulted.  The effect is that the process
will receive a SIGSEGV instead of transparently accessing the port.

Fix by restoring the tss length.  Note that i386 had this working already.

Closes bugzilla 10246.

Signed-off-by: Avi Kivity <avi@qumranet.com>