Date: Tue, 18 Nov 2025 15:02:57 +0000 From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 6e8e1de9fb06 - stable/15 - vmm: Move vm_maxcpu handling into MI code Message-ID: <691c8aa1.3737b.fe7862b@gitrepo.freebsd.org>
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The branch stable/15 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=6e8e1de9fb06e37f4b3fce9786c934393a232263 commit 6e8e1de9fb06e37f4b3fce9786c934393a232263 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2025-11-04 13:56:15 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2025-11-18 14:57:43 +0000 vmm: Move vm_maxcpu handling into MI code No functional change intended. Reviewed by: corvink MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D53477 (cherry picked from commit c46e5dc65ba5c9666bb4452878e332dc49730843) --- sys/amd64/include/vmm.h | 2 -- sys/amd64/vmm/intel/vmx.c | 2 +- sys/amd64/vmm/vmm.c | 22 ---------------------- sys/arm64/vmm/vmm.c | 20 -------------------- sys/dev/vmm/vmm_dev.c | 15 +++++++++++++++ sys/dev/vmm/vmm_dev.h | 11 +++++++++++ sys/riscv/vmm/vmm.c | 22 ---------------------- 7 files changed, 27 insertions(+), 67 deletions(-) diff --git a/sys/amd64/include/vmm.h b/sys/amd64/include/vmm.h index 0a2d5a80f2b0..5cf1ae2d769c 100644 --- a/sys/amd64/include/vmm.h +++ b/sys/amd64/include/vmm.h @@ -206,8 +206,6 @@ struct vmm_ops { extern const struct vmm_ops vmm_ops_intel; extern const struct vmm_ops vmm_ops_amd; -extern u_int vm_maxcpu; /* maximum virtual cpus */ - int vm_create(const char *name, struct vm **retvm); struct vcpu *vm_alloc_vcpu(struct vm *vm, int vcpuid); void vm_disable_vcpu_creation(struct vm *vm); diff --git a/sys/amd64/vmm/intel/vmx.c b/sys/amd64/vmm/intel/vmx.c index 842281ab862e..4189c1214b40 100644 --- a/sys/amd64/vmm/intel/vmx.c +++ b/sys/amd64/vmm/intel/vmx.c @@ -27,7 +27,6 @@ * SUCH DAMAGE. */ -#include <sys/cdefs.h> #include "opt_bhyve_snapshot.h" #include <sys/param.h> @@ -58,6 +57,7 @@ #include <machine/vmm_instruction_emul.h> #include <machine/vmm_snapshot.h> +#include <dev/vmm/vmm_dev.h> #include <dev/vmm/vmm_ktr.h> #include <dev/vmm/vmm_mem.h> diff --git a/sys/amd64/vmm/vmm.c b/sys/amd64/vmm/vmm.c index a989f93b8728..6dfa33adf63c 100644 --- a/sys/amd64/vmm/vmm.c +++ b/sys/amd64/vmm/vmm.c @@ -267,10 +267,6 @@ static int trap_wbinvd; SYSCTL_INT(_hw_vmm, OID_AUTO, trap_wbinvd, CTLFLAG_RDTUN, &trap_wbinvd, 0, "WBINVD triggers a VM-exit"); -u_int vm_maxcpu; -SYSCTL_UINT(_hw_vmm, OID_AUTO, maxcpu, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, - &vm_maxcpu, 0, "Maximum number of vCPUs"); - static void vcpu_notify_event_locked(struct vcpu *vcpu); /* global statistics */ @@ -296,14 +292,6 @@ VMM_STAT(VMEXIT_USERSPACE, "number of vm exits handled in userspace"); VMM_STAT(VMEXIT_RENDEZVOUS, "number of times rendezvous pending at exit"); VMM_STAT(VMEXIT_EXCEPTION, "number of vm exits due to exceptions"); -/* - * Upper limit on vm_maxcpu. Limited by use of uint16_t types for CPU - * counts as well as range of vpid values for VT-x and by the capacity - * of cpuset_t masks. The call to new_unrhdr() in vpid_init() in - * vmx.c requires 'vm_maxcpu + 1 <= 0xffff', hence the '- 1' below. - */ -#define VM_MAXCPU MIN(0xffff - 1, CPU_SETSIZE) - #ifdef KTR static const char * vcpu_state2str(enum vcpu_state state) @@ -405,16 +393,6 @@ vmm_modinit(void) if (!vmm_is_hw_supported()) return (ENXIO); - vm_maxcpu = mp_ncpus; - TUNABLE_INT_FETCH("hw.vmm.maxcpu", &vm_maxcpu); - - if (vm_maxcpu > VM_MAXCPU) { - printf("vmm: vm_maxcpu clamped to %u\n", VM_MAXCPU); - vm_maxcpu = VM_MAXCPU; - } - if (vm_maxcpu == 0) - vm_maxcpu = 1; - vmm_host_state_init(); vmm_ipinum = lapic_ipi_alloc(pti ? &IDTVEC(justreturn1_pti) : diff --git a/sys/arm64/vmm/vmm.c b/sys/arm64/vmm/vmm.c index 5225b995a75d..b1133be8fa3d 100644 --- a/sys/arm64/vmm/vmm.c +++ b/sys/arm64/vmm/vmm.c @@ -206,10 +206,6 @@ static const struct vmm_regs vmm_arch_regs_masks = { /* Host registers masked by vmm_arch_regs_masks. */ static struct vmm_regs vmm_arch_regs; -u_int vm_maxcpu; -SYSCTL_UINT(_hw_vmm, OID_AUTO, maxcpu, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, - &vm_maxcpu, 0, "Maximum number of vCPUs"); - static void vcpu_notify_event_locked(struct vcpu *vcpu); /* global statistics */ @@ -229,12 +225,6 @@ VMM_STAT(VMEXIT_SS, "number of vmexits for a single-step exception"); VMM_STAT(VMEXIT_UNHANDLED_EL2, "number of vmexits for an unhandled EL2 exception"); VMM_STAT(VMEXIT_UNHANDLED, "number of vmexits for an unhandled exception"); -/* - * Upper limit on vm_maxcpu. We could increase this to 28 bits, but this - * is a safe value for now. - */ -#define VM_MAXCPU MIN(0xffff - 1, CPU_SETSIZE) - static int vmm_regs_init(struct vmm_regs *regs, const struct vmm_regs *masks) { @@ -330,16 +320,6 @@ vmm_modinit(void) if (error != 0) return (error); - vm_maxcpu = mp_ncpus; - TUNABLE_INT_FETCH("hw.vmm.maxcpu", &vm_maxcpu); - - if (vm_maxcpu > VM_MAXCPU) { - printf("vmm: vm_maxcpu clamped to %u\n", VM_MAXCPU); - vm_maxcpu = VM_MAXCPU; - } - if (vm_maxcpu == 0) - vm_maxcpu = 1; - error = vmm_regs_init(&vmm_arch_regs, &vmm_arch_regs_masks); if (error != 0) return (error); diff --git a/sys/dev/vmm/vmm_dev.c b/sys/dev/vmm/vmm_dev.c index 09093fe44e2b..d6543bf6534e 100644 --- a/sys/dev/vmm/vmm_dev.c +++ b/sys/dev/vmm/vmm_dev.c @@ -18,6 +18,7 @@ #include <sys/priv.h> #include <sys/proc.h> #include <sys/queue.h> +#include <sys/smp.h> #include <sys/sx.h> #include <sys/sysctl.h> #include <sys/ucred.h> @@ -91,6 +92,10 @@ static MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev"); SYSCTL_DECL(_hw_vmm); +u_int vm_maxcpu; +SYSCTL_UINT(_hw_vmm, OID_AUTO, maxcpu, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, + &vm_maxcpu, 0, "Maximum number of vCPUs"); + static void devmem_destroy(void *arg); static int devmem_create_cdev(struct vmmdev_softc *sc, int id, char *devmem); @@ -1158,6 +1163,16 @@ vmm_handler(module_t mod, int what, void *arg) error = vmmdev_init(); if (error != 0) break; + + vm_maxcpu = mp_ncpus; + TUNABLE_INT_FETCH("hw.vmm.maxcpu", &vm_maxcpu); + if (vm_maxcpu > VM_MAXCPU) { + printf("vmm: vm_maxcpu clamped to %u\n", VM_MAXCPU); + vm_maxcpu = VM_MAXCPU; + } + if (vm_maxcpu == 0) + vm_maxcpu = 1; + error = vmm_modinit(); if (error == 0) vmm_initialized = true; diff --git a/sys/dev/vmm/vmm_dev.h b/sys/dev/vmm/vmm_dev.h index 89fe7ec4704d..f14176c8afad 100644 --- a/sys/dev/vmm/vmm_dev.h +++ b/sys/dev/vmm/vmm_dev.h @@ -57,6 +57,17 @@ struct vmmdev_ioctl { extern const struct vmmdev_ioctl vmmdev_machdep_ioctls[]; extern const size_t vmmdev_machdep_ioctl_count; +/* + * Upper limit on vm_maxcpu. Limited by use of uint16_t types for CPU counts as + * well as range of vpid values for VT-x on amd64 and by the capacity of + * cpuset_t masks. The call to new_unrhdr() in vpid_init() in vmx.c requires + * 'vm_maxcpu + 1 <= 0xffff', hence the '- 1' below. + */ +#define VM_MAXCPU MIN(0xffff - 1, CPU_SETSIZE) + +/* Maximum number of vCPUs in a single VM. */ +extern u_int vm_maxcpu; + #endif /* _KERNEL */ struct vmmctl_vm_create { diff --git a/sys/riscv/vmm/vmm.c b/sys/riscv/vmm/vmm.c index e1ba0af83fae..23b57ad3b7aa 100644 --- a/sys/riscv/vmm/vmm.c +++ b/sys/riscv/vmm/vmm.c @@ -143,10 +143,6 @@ static int vmm_ipinum; SYSCTL_INT(_hw_vmm, OID_AUTO, ipinum, CTLFLAG_RD, &vmm_ipinum, 0, "IPI vector used for vcpu notifications"); -u_int vm_maxcpu; -SYSCTL_UINT(_hw_vmm, OID_AUTO, maxcpu, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, - &vm_maxcpu, 0, "Maximum number of vCPUs"); - static void vcpu_notify_event_locked(struct vcpu *vcpu); /* global statistics */ @@ -154,12 +150,6 @@ VMM_STAT(VMEXIT_COUNT, "total number of vm exits"); VMM_STAT(VMEXIT_IRQ, "number of vmexits for an irq"); VMM_STAT(VMEXIT_UNHANDLED, "number of vmexits for an unhandled exception"); -/* - * Upper limit on vm_maxcpu. We could increase this to 28 bits, but this - * is a safe value for now. - */ -#define VM_MAXCPU MIN(0xffff - 1, CPU_SETSIZE) - static void vcpu_cleanup(struct vcpu *vcpu, bool destroy) { @@ -210,18 +200,6 @@ vm_exitinfo(struct vcpu *vcpu) int vmm_modinit(void) { - vm_maxcpu = mp_ncpus; - - TUNABLE_INT_FETCH("hw.vmm.maxcpu", &vm_maxcpu); - - if (vm_maxcpu > VM_MAXCPU) { - printf("vmm: vm_maxcpu clamped to %u\n", VM_MAXCPU); - vm_maxcpu = VM_MAXCPU; - } - - if (vm_maxcpu == 0) - vm_maxcpu = 1; - return (vmmops_modinit()); }help
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