linux-kernel - Re: [RFC PATCH 00/35] SEV-ES hypervisor support

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Message-ID: <60cbddaf-50f3-72ca-f673-ff0b421db3ad@redhat.com>
Date:   Mon, 30 Nov 2020 16:31:51 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Tom Lendacky <thomas.lendacky@....com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [RFC PATCH 00/35] SEV-ES hypervisor support

On 16/09/20 02:19, Sean Christopherson wrote:
> 
> TDX also selectively blocks/skips portions of other ioctl()s so that the
> TDX code itself can yell loudly if e.g. .get_cpl() is invoked.  The event
> injection restrictions are due to direct injection not being allowed (except
> for NMIs); all IRQs have to be routed through APICv (posted interrupts) and
> exception injection is completely disallowed.
> 
>    kvm_vcpu_ioctl_x86_get_vcpu_events:
> 	if (!vcpu->kvm->arch.guest_state_protected)
>          	events->interrupt.shadow = kvm_x86_ops.get_interrupt_shadow(vcpu);

Perhaps an alternative implementation can enter the vCPU with immediate 
exit until no events are pending, and then return all zeroes?

Paolo