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Code Issues Releases Activity

vmm: don't lock a mtx in the icr_low write handler

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x2apic accesses are handled by a wrmsr exit. This handler is called in a
critical section. So, we can't lock a mtx in the icr_low handler.

Reported by:		kp, pho
Tested by:		kp, pho
Approved by:		manu (mentor)
Fixes:			c0f35dbf19 vmm: Use a cpuset_t for vCPUs waiting for STARTUP IPIs.
MFC after:		1 week
MFC with:		c0f35dbf19
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D37452
This commit is contained in:
Corvin Köhne 2022-11-21 15:00:04 +01:00
parent 04af98db59
commit 7c326ab5bb
No known key found for this signature in database
GPG Key ID: D854DA56315E026A
1 changed files with 35 additions and 26 deletions
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61
sys/amd64/vmm/io/vlapic.c
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@ -1127,9 +1127,8 @@ vlapic_icrlo_write_handler(struct vlapic *vlapic, bool *retu)
i == vlapic->vcpuid)
break;
/* vCPU i is waiting for SIPI. */
CPU_SETOF(i, &dmask);
vm_await_start(vlapic->vm, &dmask);
CPU_SETOF(i, &ipimask);
break;
}
@ -1140,36 +1139,17 @@ vlapic_icrlo_write_handler(struct vlapic *vlapic, bool *retu)
if (!phys)
break;
/*
* Old bhyve versions don't support the IPI
* exit. Translate it into the old style.
*/
i = vm_apicid2vcpuid(vlapic->vm, dest);
if (i >= vm_get_maxcpus(vlapic->vm) ||
i == vlapic->vcpuid)
break;
/*
* Ignore SIPIs in any state other than wait-for-SIPI
*/
CPU_SETOF(i, &dmask);
dmask = vm_start_cpus(vlapic->vm, &dmask);
if (CPU_EMPTY(&dmask))
break;
CPU_SETOF(i, &ipimask);
vmexit = vm_exitinfo(vlapic->vcpu);
vmexit->exitcode = VM_EXITCODE_SPINUP_AP;
vmexit->u.spinup_ap.vcpu = i;
vmexit->u.spinup_ap.rip = vec << PAGE_SHIFT;
*retu = true;
break;
}
/*
* Ignore SIPIs in any state other than wait-for-SIPI
*/
ipimask = vm_start_cpus(vlapic->vm, &dmask);
CPU_COPY(&dmask, &ipimask);
break;
default:
return (1);
@ -1199,14 +1179,43 @@ vlapic_handle_init(struct vcpu *vcpu, void *arg)
int
vm_handle_ipi(struct vcpu *vcpu, struct vm_exit *vme, bool *retu)
{
struct vlapic *vlapic = vm_lapic(vcpu);
cpuset_t *dmask = &vme->u.ipi.dmask;
uint8_t vec = vme->u.ipi.vector;
*retu = true;
switch (vme->u.ipi.mode) {
case APIC_DELMODE_INIT:
vm_smp_rendezvous(vcpu, vme->u.ipi.dmask, vlapic_handle_init,
vm_smp_rendezvous(vcpu, *dmask, vlapic_handle_init,
NULL);
vm_await_start(vcpu_vm(vcpu), &vme->u.ipi.dmask);
vm_await_start(vcpu_vm(vcpu), dmask);
if (!vlapic->ipi_exit) {
*retu = false;
}
break;
case APIC_DELMODE_STARTUP:
/*
* Ignore SIPIs in any state other than wait-for-SIPI
*/
*dmask = vm_start_cpus(vcpu_vm(vcpu), dmask);
if (CPU_EMPTY(dmask)) {
*retu = false;
break;
}
/*
* Old bhyve versions don't support the IPI
* exit. Translate it into the old style.
*/
if (!vlapic->ipi_exit) {
vme->exitcode = VM_EXITCODE_SPINUP_AP;
vme->u.spinup_ap.vcpu = CPU_FFS(dmask);
vme->u.spinup_ap.rip = vec << PAGE_SHIFT;
}
break;
default:
return (1);