linux-kernel - Re: [PATCH] KVM: VMX: Explicitly check for hv_remote_flush

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Date:   Fri, 25 Sep 2020 09:24:26 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: VMX: Explicitly check for hv_remote_flush_tlb when
 loading pgd()

On Fri, Sep 25, 2020 at 11:59:00AM +0200, Vitaly Kuznetsov wrote:
> Sean Christopherson <sean.j.christopherson@...el.com> writes:
> > +#if IS_ENABLED(CONFIG_HYPERV)
> >  	enum ept_pointers_status ept_pointers_match;
> >  	spinlock_t ept_pointer_lock;
> > +#endif
> 
> Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> 
> In case ept_pointers_match/ept_pointer_lock are useless for TDX we may
> want to find better names for them to make it clear this is a Hyper-V
> thingy (e.g. something like hv_tlb_ept_match/hv_tlb_ept_lock).

Good call.  I'll send a v2, looking at hv_remote_flush_tlb_with_range(), I
think there are additional cleanups/optimizations that can be done, e.g. do the
extra flushes only on vCPUs with a mistmatching EPTP instead of flushing all
vCPUs' EPTPs if _any_ vCPU has a mismatched EPTP.

> 
> >  };
> >  
> >  bool nested_vmx_allowed(struct kvm_vcpu *vcpu);
> 
> -- 
> Vitaly
>