Re: [Xen-devel] [PATCH v1 2/2] x86/vvmx: add vmcs id check into vmptrld emulation

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Sergey Dyasli [mailto:sergey.dyasli@xxxxxxxxxx]
> Sent: Wednesday, March 01, 2017 5:14 PM
> 
> If a guest will do vmptrld with an incorrect vmcs id:
> 
> (XEN) Xen BUG at .../git/upstream/xen/xen/include/asm/hvm/vmx/vmx.h:333
> (XEN) ----[ Xen-4.9-unstable  x86_64  debug=y   Tainted:    H ]----
> (XEN) Xen call trace:
> (XEN)    [<ffff82d0801f925e>]
> vmcs.c#arch/x86/hvm/vmx/vmcs.o.unlikely+0x28/0x19a
> (XEN)    [<ffff82d0801f602c>] virtual_vmcs_vmread+0x11/0x2c
> (XEN)    [<ffff82d0802002cc>] vvmx.c#_map_io_bitmap+0x86/0x88
> (XEN)    [<ffff82d080202399>] nvmx_handle_vmptrld+0xf0/0x1fb
> (XEN)    [<ffff82d0801fe93c>] vmx_vmexit_handler+0x132b/0x1c49
> (XEN)    [<ffff82d080203e6c>] vmx_asm_vmexit_handler+0x3c/0x120
> 
> Fix this by adding appropriate checks for vmcs id during vmptrld
> emulation.
> 
> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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