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Mon, 08 Jun 2026 02:34:34 -0700 (PDT) List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 From: Mario Marietto Date: Mon, 8 Jun 2026 11:33:57 +0200 X-Gm-Features: AVVi8CcRnY3lFMvWL7S1oZO_9urylWo34x3-J-f_pGD-SKclGu9FN4I6HHsaJms Message-ID: Subject: How FLR has been implemented inside the Corvin's code for the nVidia GPU. To: FreeBSD virtualization , =?UTF-8?Q?Corvin_K=C3=B6hne?= , =?UTF-8?Q?Corvin_K=C3=B6hne?= Content-Type: multipart/alternative; boundary="000000000000e50b940653bab7ff" X-Spamd-Result: default: False [-4.95 / 15.00]; ARC_ALLOW(-1.00)[google.com:s=arc-20240605:i=1]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.95)[-0.949]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4864::/56:c]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20251104]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; TO_DN_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; DKIM_TRACE(0.00)[gmail.com:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; FREEMAIL_FROM(0.00)[gmail.com]; RCPT_COUNT_THREE(0.00)[3]; RCVD_COUNT_ONE(0.00)[1]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; TO_MATCH_ENVRCPT_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; MISSING_XM_UA(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-virtualization@freebsd.org]; MLMMJ_DEST(0.00)[freebsd-virtualization@freebsd.org]; MID_RHS_MATCH_FROMTLD(0.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::62d:from] X-Spamd-Bar: ---- X-Rspamd-Queue-Id: 4gYn1r5Yl1z3nHl --000000000000e50b940653bab7ff Content-Type: text/plain; charset="UTF-8" Hello Corvin and everyone. I'm continuing the development of the initial project of Abhinav Chavali, the VMM Accelerator support for QEMU : https://summerofcode.withgoogle.com/archive/2025/projects/lRkVElCJ It seems that it works fine,but I would like to know. How was FLR implemented in the code Corvin wrote to pass the NVIDIA GPU to a Linux-based VM? I ask because when I use the Corvin's patched bhyve, or perhaps his vmm, I don't see any system freezes when I load and unload the vmm module from memory. It used to happen at the beginning,I remember well, but later not anymore. However, when I do it with qemu accelerated with bhyve, the problem still occurs. I asked Claude to look into Corvin's code to understand how he handled it, but even after doing so, the problem persists. -- Mario. --000000000000e50b940653bab7ff Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello Corvin and everyone.

I= 'm continuing the development of the initial project of Abhinav Chavali= , the VMM Accelerator support for QEMU :

=09
=09 =09 =09

https://summerofcode.withgoogle.com/archive/20= 25/projects/lRkVElCJ


It seems that it works fine,but I would like to know.

=
How was FLR implemented in the code Corvin= wrote to pass the NVIDIA GPU to a Linux-based VM? I ask because w= hen I use the Corvin's patched bhyve, or perhaps his vmm, I don't s= ee any system freezes when I load and unload the vmm module from memory. It use= d to happen at the beginning,I remember well, but later not anymore.= However, w= hen I do it with qemu accelerated with bhyve, the problem still occurs. I asked= Claude to look into Corvin's code to understand how he handled it, but= even after doing so, the problem persists.

--
Mario.
--000000000000e50b940653bab7ff--