src/sys/amd64/vmm, branch main

amd64: FRED support

2026-07-20T21:51:02Z

FRED support as defined starting from the SDM rev. 90, requires a new 'events' entry point to receive user and kernel mode exceptions and interrupts notifications from the hardware. A minimal asm trampoline is enough, rest can be implemented in C due to the clean FRED organization of the event reporting. The syscall entry is handled by a microptimized assembly path, directly calling into the amd64_syscall() handler, instead of the generic events entry point. Tested by: emaste Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D55829

amd64/vmm: Fix ppt_unmap_mmio() after commit 36b855f18925

2026-05-22T22:18:48Z

Fixes: 36b855f18925 ("amd64/vmm: Lock global PCI passthrough structures") MFC after: 3 days Reported by: bz

kernel: address executable stack warnings in amd64 gcc build

2026-05-16T20:24:45Z

Mark assembly files as not requiring executable stacks. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D56946

PHYS_TO_DMAP: Return a void * instead of a vm_offset_t

2026-04-23T17:05:54Z

Add a new PHYS_TO_DMAP_ADDR that still returns an address for use in places that only need an address and not a pointer. Effort: CHERI upstreaming Reviewed by: kib Sponsored by: AFRL, DARPA Pull Request: https://github.com/freebsd/freebsd-src/pull/2068

vmm: Add missing AVX instructions for AVX512 in cpuid stdext

2026-03-30T07:19:44Z

Reported by: Tom Reviewed by: markj Tested by: Tom MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D56021

vmm: Move defines from x86.c to x86/bhyve.h

2026-03-28T05:54:49Z

The values CPUID_BHYVE_FEATURES and CPUID_BHYVE_FEAT_EXT_DEST_ID are useful for guests, not just hosts; so they belong in a header file in sys/x86/include rather than simply in the .c file implementing the bhyve host side. The original addition of these defines took place without adding a copyright statement, but since I'm moving them into a new file I've added the original author's standard copyright (Amazon). MFC after: 3 weeks Fixes: 313a68ea20b4 ("bhyve: Add CPUID_BHYVE_FEATURES leaf") Sponsored by: Amazon Differential Revision: https://reviews.freebsd.org/D55430

vmm: Allow the use of PCI passthrough in a jail

2026-02-16T15:28:49Z

After commit e11768e94787 ("vmm: Add PRIV_DRIVER checks for passthru ioctls"), it is not possible to use PCI passthru from jails, as PRIV_DRIVER is not granted to jails. Apparently some users expect this to work, understanding that jailing bhyve provides little security benefit in this configuration. I believe we should disable ppt access in jails even when allow.vmm is configured. To provide an escape hatch for users, add a new allow.vmm_ppt jail configuration knob, and check it when handling ppt ioctls in jails. Also add a new PRIV_VMM_PPTDEV to replace the use of PRIV_DRIVER. PR: 292750 Reviewed by: corvink MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D55066

amd64/vmm: Lock global PCI passthrough structures

2026-02-06T15:38:51Z

There is a global list of ppt-claimed devices, accessed via several vmm ioctls. The ioctls are locked by per-VM locks, but this isn't sufficient to prevent multiple VMs from trying to bind a given device. Add a sleepable lock and use that to synchronize all access to ppt devices. Reviewed by: corvink, jhb MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D55065

amd64: Fix sys/pcpu.h usage in vmm_host.h and md_var.h

2026-01-24T01:29:45Z

Include sys/pcpu in vmm_host.h as its structs and functions are used there, and add a forward declaration of struct pcpu to md_var.h as it is used in some function prototypes. Reviewed by: corvink, markj MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D51550

amd64/vmm: remove unused static function vcpu_state2str()

2026-01-19T16:45:40Z

It is guarded by #ifdef KTR, so the warning does not show up under usual kernel configs. Fixes: ed85203fb7a0334041db6da07e45ddda4caef13d Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D54781