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Re: [PATCH v2 3/3] x86/vmx: Disallow the use of inactivity states
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 12 Jan 2024 12:04:30 +0100
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- Cc: Reima Ishii <ishiir@xxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Takahiro Shinagawa <shina@xxxxxxxxxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 12 Jan 2024 11:04:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.01.2024 11:43, Andrew Cooper wrote:
> On 12/01/2024 10:37 am, Jan Beulich wrote:
>> On 12.01.2024 00:13, Andrew Cooper wrote:
>>> --- a/xen/arch/x86/hvm/vmx/vmx.c
>>> +++ b/xen/arch/x86/hvm/vmx/vmx.c
>>> @@ -1551,7 +1551,10 @@ static void cf_check vmx_set_nonreg_state(struct
>>> vcpu *v,
>>> {
>>> vmx_vmcs_enter(v);
>>>
>>> - __vmwrite(GUEST_ACTIVITY_STATE, nrs->vmx.activity_state);
>>> + if ( nrs->vmx.activity_state )
>>> + domain_crash(v->domain, "Attempt to set activity_state %#lx\n",
>>> + nrs->vmx.activity_state);
>> Might be useful to log the offending vCPU here?
>
> Already covered. the innards of __domain_crash() does:
>
> else if ( d == current->domain )
> {
> printk("Domain %d (vcpu#%d) crashed on cpu#%d:\n",
> ...
Except that afaict v != current here at all times (at least as far as
current use of the function goes).
Jan
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