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Subject: Re: [RFC PATCH 00/35] SEV-ES hypervisor support
To:     Tom Lendacky <thomas.lendacky@amd.com>,
        Sean Christopherson <seanjc@google.com>
Cc:     kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Brijesh Singh <brijesh.singh@amd.com>
References: <cover.1600114548.git.thomas.lendacky@amd.com>
 <20200914225951.GM7192@sjchrist-ice>
 <bee6fdda-d548-8af5-f029-25c22165bf84@amd.com>
 <20200916001925.GL8420@sjchrist-ice>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <60cbddaf-50f3-72ca-f673-ff0b421db3ad@redhat.com>
Date:   Mon, 30 Nov 2020 16:31:51 +0100
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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