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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id g10sm4237082ejj.44.2021.08.02.02.05.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Aug 2021 02:05:10 -0700 (PDT) Subject: Re: QEMU on x64 To: Christopher Caulfield , qemu-devel@nongnu.org References: From: Paolo Bonzini Message-ID: <6dc5002f-5e64-4850-f989-eb5651d74487@redhat.com> Date: Mon, 2 Aug 2021 11:05:09 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.699, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.08, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alexsmendez@live.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 30/07/21 19:36, Christopher Caulfield wrote: > Hi QEMU community, > > This is Christopher from the debugging experiences team at Microsoft > focused on kernel debugging. I am reaching out with a few questions > about QEMU on x64. > > 1. Is it possible for the QEMU-x86-64 GDB Server to send the full set > of x64 system registers (whether they are included in a separated > system xml file or as part of the core registers xml file)? > * e.g. System registers missing from i386-64bit.xml file > > DWORD64 IDTBase; > DWORD64 IDTLimit; > DWORD64 GDTBase; > DWORD64 GDTLimit; > DWORD SelLDT; > SEG64_DESC_INFO SegLDT; > DWORD SelTSS; > SEG64_DESC_INFO SegTSS; Yes, that is possible. > 2. How can I access x64 MSR registers by using the QEMU-x86-64 GDB server? > * #define MSR_EFER 0xc0000080 // extended function enable register > #define MSR_STAR 0xc0000081 // system call selectors > #define MSR_LSTAR 0xc0000082 // system call 64-bit entry > #define MSR_CSTAR 0xc0000083 // system call 32-bit entry > 3. Going off of #2 - can you access it via reading GDB memory command? > if not - is there any plan to support reading/writing to MSRs via > QEMU-x86-64 GDB server? Right now it's not possible, but for specific MSRs it's possible to add them to the XML and export them. Can you create an issue on https://gitlab.com/qemu-project/qemu/-/issues please? Paolo