From: Paolo Bonzini <pbonzini@redhat.com>
To: Maxim Levitsky <mlevitsk@redhat.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Cc: Sean Christopherson <seanjc@google.com>
Subject: Re: Another nice lockdep print in nested SVM code
Date: Tue, 26 Apr 2022 19:05:51 +0200 [thread overview]
Message-ID: <9eb9d0db-f8d1-e555-567c-b76a85997701@redhat.com> (raw)
In-Reply-To: <2dea96f99ee7b3b47702292a699d9ac7af1afaaf.camel@redhat.com>
On 4/26/22 18:56, Maxim Levitsky wrote:
>> Yeah, in that case I can't think of anything better than triple fault.
>>
>> Paolo
>>
> But do you think that it would be better to keep the vmcb12 page mapped/pinned while doing the nested run
> which will both solve the problem of calling sleeping function and allow us
> to remove the case of map failing on vm exit?
>
> If I remember correctly, vmx does something like that.
Yes, it does, but that's because vmx would have to do a lot of mapping
and unmapping for vmread/vmwrite on highmem (32-bit) kernels. So it
maps at vmptrld and unmaps and vmclear. I wouldn't consider it an
example to follow.
Paolo
next prev parent reply other threads:[~2022-04-26 17:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-26 16:39 Another nice lockdep print in nested SVM code Maxim Levitsky
2022-04-26 16:43 ` Maxim Levitsky
2022-04-26 16:47 ` Paolo Bonzini
2022-04-26 16:56 ` Maxim Levitsky
2022-04-26 17:05 ` Paolo Bonzini [this message]
2022-04-26 17:08 ` Maxim Levitsky
2022-04-26 17:29 ` Paolo Bonzini
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