Re: [Xen-devel] [PATCH v1 1/2] x86/vvmx: check vmcs address in vmread/vmwrite

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 01/03/17 09:13, Sergey Dyasli wrote:
> If nested vmcs's address is invalid, virtual_vmcs_enter() will fail
> during vmread/vmwrite:
>
> (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)    [<ffff82d0801f60e3>] virtual_vmcs_vmwrite_safe+0x16/0x52
> (XEN)    [<ffff82d080202cb2>] nvmx_handle_vmwrite+0x70/0xfe
> (XEN)    [<ffff82d0801fe98a>] vmx_vmexit_handler+0x1379/0x1c49
> (XEN)    [<ffff82d08020427c>] vmx_asm_vmexit_handler+0x3c/0x120
>
> Fix this by emulating VMfailInvalid if the address is invalid.
>
> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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