linux-kernel - Re: [PATCH v3 2/2] x86: sgx_vepc: implement SGX_IOC_VEPC

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Date:   Mon, 18 Oct 2021 19:45:36 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        dave.hansen@...ux.intel.com, x86@...nel.org, yang.zhong@...el.com,
        jarkko@...nel.org, bp@...e.de
Subject: Re: [PATCH v3 2/2] x86: sgx_vepc: implement SGX_IOC_VEPC_REMOVE ioctl

On 18/10/21 19:17, Sean Christopherson wrote:
> 			/*
> 			 * Report errors due to #GP or SGX_ENCLAVE_ACT, but do
> 			 * not WARN as userspace can induce said failures by
> 			 * calling the ioctl concurrently on multiple vEPCs or
> 			 * while one or more CPUs is running the enclave.  Only
> 			 * a #PF on EREMOVE indicates a kernel/hardware issue.
> 			 */
> 			WARN_ON_ONCE(encls_faulted(ret) &&
> 				     ENCLS_TRAPNR(ret) == X86_TRAP_PF);

or != X86_TRAP_GP, just to avoid having a v5? :)

Paolo