x86/nestedhvm: properly clean up after failure to set up all vCPU-s

This implies that the individual destroy functions will have to remain
capable of being called for a vCPU that the corresponding init function
was never run on.

Once at it, also clean up some inefficiencies in the corresponding
parameter validation code.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
nEPT: fix EPT pointer setting for L2 guest

Each time in virtual_vmentry(), the code needs to cover both EPT
and shadow mode for L2 guest, updating different EPT pointer to
shadow VMCS.

This fixes the issue that, launch a guest with EPT, then kill it
and launch a second guest with shadow, the second guest will hang
at the startup screen.

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Acked by: Eddie Dong <eddie.dong@intel.com>
Committed-by: Jan Beulich <jbeulich@suse.com>
nEPT: fix INVEPT instruction parameter

While emulating the INVEPT instruction in L0 VMM, the EPT pointer
should be fetched from the instruction decoding result, but not
the current loaded EPT pointer.

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
Committed-by: Jan Beulich <jbeulich@suse.com>
x86/EFI: simplify PCI option ROM retrieval

While putting together the kernel side of this I realized that c/s
26397:d9c7b82aa7b1 went a little too far in requiring a buffer for the
option ROM contents - all that is really needed is handing Dom0
physical address and size of the data block.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Merge commit 'origin/staging' into libxl_qmp
fix some compile error. but the function is not right