Re: [BUG] Nested Virtualization Bug on x86-64 AMD CPU

On 21/04/2025 6:53 pm, REIMA ISHII wrote: > I am writing to follow up on the bug report I sent, regarding a BUG() > triggered in Xen when performing a nested VMRUN with CR0.PG > =0 in Long > Mode. The issue was discussed with Andrew Cooper at that time, and I > would like to check if

Re: [BUG] Nested Virtualization Bug on x86-64 AMD CPU

I am writing to follow up on the bug report I sent, regarding a BUG() triggered in Xen when performing a nested VMRUN with CR0.PG=0 in Long Mode. The issue was discussed with Andrew Cooper at that time, and I would like to check if there have been any updates or plans for addressing this issue. To

Re: [BUG] Nested Virtualization Bug on x86-64 AMD CPU

Thank you for your prompt response. On Tue, Dec 5, 2023 at 11:43 PM Andrew Cooper wrote: > Who is still in 64-bit mode ? > > It is legal for a 64-bit L1 to VMRUN into a 32-bit L2 with PG=0. > > But I'm guessing that you mean L2 is also 64-bit, and we're clearing PG, > thus creating an illegal sta

Re: [BUG] Nested Virtualization Bug on x86-64 AMD CPU

On 05/12/2023 1:51 pm, Reima ISHII wrote: > Dear Xen Development Team, > > I am writing to report a bug that I have encountered in a Xen HVM > guest with nested virtualization. > Below is a detailed description of the bug, its potential impact, and > the environment in which it was observed. > > [B

[BUG] Nested Virtualization Bug on x86-64 AMD CPU

Dear Xen Development Team, I am writing to report a bug that I have encountered in a Xen HVM guest with nested virtualization. Below is a detailed description of the bug, its potential impact, and the environment in which it was observed. [Bug Description] The issue emerges when operating an HVM