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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id q25sm14448253edt.51.2021.04.26.06.28.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 26 Apr 2021 06:28:41 -0700 (PDT) Subject: Re: [PATCH v2 4/6] KVM: x86: Introduce KVM_GET_SREGS2 / KVM_SET_SREGS2 To: Maxim Levitsky , kvm@vger.kernel.org Cc: "open list:DOCUMENTATION" , Thomas Gleixner , Jonathan Corbet , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "H. Peter Anvin" , Ingo Molnar , Borislav Petkov , Wanpeng Li , Vitaly Kuznetsov , Jim Mattson , Sean Christopherson , Joerg Roedel References: <20210426111333.967729-1-mlevitsk@redhat.com> <20210426111333.967729-5-mlevitsk@redhat.com> <898a9b18-4578-cb9d-ece7-f45ba5b7bb89@redhat.com> From: Paolo Bonzini Message-ID: <05161b6e-6d85-be14-9e30-e61cb742f6d0@redhat.com> Date: Mon, 26 Apr 2021 15:28:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On 26/04/21 14:56, Maxim Levitsky wrote: > On Mon, 2021-04-26 at 14:32 +0200, Paolo Bonzini wrote: >> On 26/04/21 13:13, Maxim Levitsky wrote: >>> + if (sregs2->flags & KVM_SREGS2_FLAGS_PDPTRS_VALID) { >>> + >>> + if (!is_pae_paging(vcpu)) >>> + return -EINVAL; >>> + >>> + for (i = 0 ; i < 4 ; i++) >>> + kvm_pdptr_write(vcpu, i, sregs2->pdptrs[i]); >>> + >>> + kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR); >>> + mmu_reset_needed = 1; >>> + } >> >> I think this should also have >> >> else { >> if (is_pae_paging(vcpu)) >> return -EINVAL; >> } > > > What about the case when we migrate from qemu that doesn't use > this ioctl to qemu that does? Right, that makes sense but then the "else" branch should do the same as KVM_SET_SREGS. Maybe add a "load_pdptrs" bool to __set_sregs_common? Paolo