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Re: [Xen-devel] [PATCH 4/4] x86/vvmx: Don't handle unknown nested vmexit reasons at L0
- To: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 26 Oct 2018 10:10:50 +0100
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- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- Delivery-date: Fri, 26 Oct 2018 09:10:56 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 26/10/2018 10:05, Sergey Dyasli wrote:
>
> On 25/10/2018 16:39, Andrew Cooper wrote:
>> This is very dangerous from a security point of view, because a missing entry
>> will cause L2's action to be interpreted as L1's action.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> ---
>> CC: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
>> CC: Jun Nakajima <jun.nakajima@xxxxxxxxx>
>> CC: Kevin Tian <kevin.tian@xxxxxxxxx>
>> ---
>> xen/arch/x86/hvm/vmx/vvmx.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
>> index d1c8a41..817d85f 100644
>> --- a/xen/arch/x86/hvm/vmx/vvmx.c
>> +++ b/xen/arch/x86/hvm/vmx/vvmx.c
>> @@ -2609,8 +2609,9 @@ int nvmx_n2_vmexit_handler(struct cpu_user_regs *regs,
>> nvcpu->nv_vmexit_pending = 1;
>> break;
>> default:
>> - gprintk(XENLOG_ERR, "Unexpected nested vmexit: reason %u\n",
>> + gprintk(XENLOG_ERR, "Unhandled nested vmexit: reason %u\n",
>> exit_reason);
>> + domain_crash(v->domain);
>> }
>>
>> return ( nvcpu->nv_vmexit_pending == 1 );
> Can you consider adding handling for the following?
>
> EXIT_REASON_INVD
> EXIT_REASON_RDTSCP
> EXIT_REASON_VMFUNC
Looks like these should be merged in with the INVVPID change, if your
happy with that?
~Andrew
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