/* $Id: PDMAll.cpp 90436 2021-07-30 16:03:48Z vboxsync $ */ /** @file * PDM Critical Sections */ /* * Copyright (C) 2006-2020 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_PDM #include "PDMInternal.h" #include #include #include #include #include #include #include #include #include "PDMInline.h" #include "dtrace/VBoxVMM.h" /** * Gets the pending interrupt. * * @returns VBox status code. * @retval VINF_SUCCESS on success. * @retval VERR_APIC_INTR_MASKED_BY_TPR when an APIC interrupt is pending but * can't be delivered due to TPR priority. * @retval VERR_NO_DATA if there is no interrupt to be delivered (either APIC * has been software-disabled since it flagged something was pending, * or other reasons). * * @param pVCpu The cross context virtual CPU structure. * @param pu8Interrupt Where to store the interrupt. */ VMMDECL(int) PDMGetInterrupt(PVMCPUCC pVCpu, uint8_t *pu8Interrupt) { /* * The local APIC has a higher priority than the PIC. */ int rc = VERR_NO_DATA; if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_INTERRUPT_APIC)) { VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_INTERRUPT_APIC); uint32_t uTagSrc; rc = APICGetInterrupt(pVCpu, pu8Interrupt, &uTagSrc); if (RT_SUCCESS(rc)) { if (rc == VINF_SUCCESS) VBOXVMM_PDM_IRQ_GET(pVCpu, RT_LOWORD(uTagSrc), RT_HIWORD(uTagSrc), *pu8Interrupt); return rc; } /* else if it's masked by TPR/PPR/whatever, go ahead checking the PIC. Such masked interrupts shouldn't prevent ExtINT from being delivered. */ } PVMCC pVM = pVCpu->CTX_SUFF(pVM); pdmLock(pVM); /* * Check the PIC. */ if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_INTERRUPT_PIC)) { VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_INTERRUPT_PIC); Assert(pVM->pdm.s.Pic.CTX_SUFF(pDevIns)); Assert(pVM->pdm.s.Pic.CTX_SUFF(pfnGetInterrupt)); uint32_t uTagSrc; int i = pVM->pdm.s.Pic.CTX_SUFF(pfnGetInterrupt)(pVM->pdm.s.Pic.CTX_SUFF(pDevIns), &uTagSrc); AssertMsg(i <= 255 && i >= 0, ("i=%d\n", i)); if (i >= 0) { pdmUnlock(pVM); *pu8Interrupt = (uint8_t)i; VBOXVMM_PDM_IRQ_GET(pVCpu, RT_LOWORD(uTagSrc), RT_HIWORD(uTagSrc), i); return VINF_SUCCESS; } } /* * One scenario where we may possibly get here is if the APIC signaled a pending interrupt, * got an APIC MMIO/MSR VM-exit which disabled the APIC. We could, in theory, clear the APIC * force-flag from all the places which disables the APIC but letting PDMGetInterrupt() fail * without returning a valid interrupt still needs to be handled for the TPR masked case, * so we shall just handle it here regardless if we choose to update the APIC code in the future. */ pdmUnlock(pVM); return rc; } /** * Sets the pending interrupt coming from ISA source or HPET. * * @returns VBox status code. * @param pVM The cross context VM structure. * @param u8Irq The IRQ line. * @param u8Level The new level. * @param uTagSrc The IRQ tag and source tracer ID. */ VMMDECL(int) PDMIsaSetIrq(PVMCC pVM, uint8_t u8Irq, uint8_t u8Level, uint32_t uTagSrc) { pdmLock(pVM); /** @todo put the IRQ13 code elsewhere to avoid this unnecessary bloat. */ if (!uTagSrc && (u8Level & PDM_IRQ_LEVEL_HIGH)) /* FPU IRQ */ { if (u8Level == PDM_IRQ_LEVEL_HIGH) VBOXVMM_PDM_IRQ_HIGH(VMMGetCpu(pVM), 0, 0); else VBOXVMM_PDM_IRQ_HILO(VMMGetCpu(pVM), 0, 0); } int rc = VERR_PDM_NO_PIC_INSTANCE; /** @todo r=bird: This code is incorrect, as it ASSUMES the PIC and I/O APIC * are always ring-0 enabled! */ if (pVM->pdm.s.Pic.CTX_SUFF(pDevIns)) { Assert(pVM->pdm.s.Pic.CTX_SUFF(pfnSetIrq)); pVM->pdm.s.Pic.CTX_SUFF(pfnSetIrq)(pVM->pdm.s.Pic.CTX_SUFF(pDevIns), u8Irq, u8Level, uTagSrc); rc = VINF_SUCCESS; } if (pVM->pdm.s.IoApic.CTX_SUFF(pDevIns)) { Assert(pVM->pdm.s.IoApic.CTX_SUFF(pfnSetIrq)); /* * Apply Interrupt Source Override rules. * See ACPI 4.0 specification 5.2.12.4 and 5.2.12.5 for details on * interrupt source override. * Shortly, ISA IRQ0 is electically connected to pin 2 on IO-APIC, and some OSes, * notably recent OS X rely upon this configuration. * If changing, also update override rules in MADT and MPS. */ /* ISA IRQ0 routed to pin 2, all others ISA sources are identity mapped */ if (u8Irq == 0) u8Irq = 2; pVM->pdm.s.IoApic.CTX_SUFF(pfnSetIrq)(pVM->pdm.s.IoApic.CTX_SUFF(pDevIns), NIL_PCIBDF, u8Irq, u8Level, uTagSrc); rc = VINF_SUCCESS; } if (!uTagSrc && u8Level == PDM_IRQ_LEVEL_LOW) VBOXVMM_PDM_IRQ_LOW(VMMGetCpu(pVM), 0, 0); pdmUnlock(pVM); return rc; } /** * Sets the pending I/O APIC interrupt. * * @returns VBox status code. * @param pVM The cross context VM structure. * @param u8Irq The IRQ line. * @param uBusDevFn The bus:device:function of the device initiating the IRQ. * Pass NIL_PCIBDF when it's not a PCI device or interrupt. * @param u8Level The new level. * @param uTagSrc The IRQ tag and source tracer ID. */ VMM_INT_DECL(int) PDMIoApicSetIrq(PVM pVM, PCIBDF uBusDevFn, uint8_t u8Irq, uint8_t u8Level, uint32_t uTagSrc) { if (pVM->pdm.s.IoApic.CTX_SUFF(pDevIns)) { Assert(pVM->pdm.s.IoApic.CTX_SUFF(pfnSetIrq)); pVM->pdm.s.IoApic.CTX_SUFF(pfnSetIrq)(pVM->pdm.s.IoApic.CTX_SUFF(pDevIns), uBusDevFn, u8Irq, u8Level, uTagSrc); return VINF_SUCCESS; } return VERR_PDM_NO_PIC_INSTANCE; } /** * Broadcasts an EOI to the I/O APIC(s). * * @param pVM The cross context VM structure. * @param uVector The interrupt vector corresponding to the EOI. */ VMM_INT_DECL(void) PDMIoApicBroadcastEoi(PVMCC pVM, uint8_t uVector) { /* * At present, we support only a maximum of one I/O APIC per-VM. If we ever implement having * multiple I/O APICs per-VM, we'll have to broadcast this EOI to all of the I/O APICs. */ PCPDMIOAPIC pIoApic = &pVM->pdm.s.IoApic; #ifdef IN_RING0 if (pIoApic->pDevInsR0) { Assert(pIoApic->pfnSetEoiR0); pIoApic->pfnSetEoiR0(pIoApic->pDevInsR0, uVector); } else if (pIoApic->pDevInsR3) { /* Queue for ring-3 execution. */ PPDMDEVHLPTASK pTask = (PPDMDEVHLPTASK)PDMQueueAlloc(pVM->pdm.s.pDevHlpQueueR0); if (pTask) { pTask->enmOp = PDMDEVHLPTASKOP_IOAPIC_SET_EOI; pTask->pDevInsR3 = NIL_RTR3PTR; /* not required */ pTask->u.IoApicSetEoi.uVector = uVector; PDMQueueInsertEx(pVM->pdm.s.pDevHlpQueueR0, &pTask->Core, 0); } else AssertMsgFailed(("We're out of devhlp queue items!!!\n")); } #else if (pIoApic->pDevInsR3) { Assert(pIoApic->pfnSetEoiR3); pIoApic->pfnSetEoiR3(pIoApic->pDevInsR3, uVector); } #endif } /** * Send a MSI to an I/O APIC. * * @param pVM The cross context VM structure. * @param uBusDevFn The bus:device:function of the device initiating the MSI. * @param pMsi The MSI to send. * @param uTagSrc The IRQ tag and source tracer ID. */ VMM_INT_DECL(void) PDMIoApicSendMsi(PVMCC pVM, PCIBDF uBusDevFn, PCMSIMSG pMsi, uint32_t uTagSrc) { PCPDMIOAPIC pIoApic = &pVM->pdm.s.IoApic; #ifdef IN_RING0 if (pIoApic->pDevInsR0) pIoApic->pfnSendMsiR0(pIoApic->pDevInsR0, uBusDevFn, pMsi, uTagSrc); else if (pIoApic->pDevInsR3) { /* Queue for ring-3 execution. */ PPDMDEVHLPTASK pTask = (PPDMDEVHLPTASK)PDMQueueAlloc(pVM->pdm.s.pDevHlpQueueR0); if (pTask) { pTask->enmOp = PDMDEVHLPTASKOP_IOAPIC_SEND_MSI; pTask->pDevInsR3 = NIL_RTR3PTR; /* not required */ pTask->u.IoApicSendMsi.uBusDevFn = uBusDevFn; pTask->u.IoApicSendMsi.Msi = *pMsi; pTask->u.IoApicSendMsi.uTagSrc = uTagSrc; PDMQueueInsertEx(pVM->pdm.s.pDevHlpQueueR0, &pTask->Core, 0); } else AssertMsgFailed(("We're out of devhlp queue items!!!\n")); } #else if (pIoApic->pDevInsR3) { Assert(pIoApic->pfnSendMsiR3); pIoApic->pfnSendMsiR3(pIoApic->pDevInsR3, uBusDevFn, pMsi, uTagSrc); } #endif } /** * Returns the presence of an IO-APIC. * * @returns true if an IO-APIC is present. * @param pVM The cross context VM structure. */ VMM_INT_DECL(bool) PDMHasIoApic(PVM pVM) { return pVM->pdm.s.IoApic.pDevInsR3 != NULL; } /** * Returns the presence of an APIC. * * @returns true if an APIC is present. * @param pVM The cross context VM structure. */ VMM_INT_DECL(bool) PDMHasApic(PVM pVM) { return pVM->pdm.s.Apic.pDevInsR3 != NIL_RTR3PTR; } /** * Locks PDM. * * This might call back to Ring-3 in order to deal with lock contention in RC * and R0. * * @param pVM The cross context VM structure. */ void pdmLock(PVMCC pVM) { #ifdef IN_RING3 int rc = PDMCritSectEnter(pVM, &pVM->pdm.s.CritSect, VERR_IGNORED); AssertRC(rc); #else int rc = PDMCritSectEnter(pVM, &pVM->pdm.s.CritSect, VERR_GENERAL_FAILURE); if (RT_SUCCESS(rc)) { /* likely */ } else { if (rc == VERR_GENERAL_FAILURE) rc = VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_PDM_LOCK, 0); PDM_CRITSECT_RELEASE_ASSERT_RC(pVM, &pVM->pdm.s.CritSect, rc); } #endif } /** * Locks PDM but don't go to ring-3 if it's owned by someone. * * @returns VINF_SUCCESS on success. * @returns rc if we're in GC or R0 and can't get the lock. * @param pVM The cross context VM structure. * @param rcBusy The RC to return in GC or R0 when we can't get the lock. */ int pdmLockEx(PVMCC pVM, int rcBusy) { return PDMCritSectEnter(pVM, &pVM->pdm.s.CritSect, rcBusy); } /** * Unlocks PDM. * * @param pVM The cross context VM structure. */ void pdmUnlock(PVMCC pVM) { PDMCritSectLeave(pVM, &pVM->pdm.s.CritSect); } /** * Checks if this thread is owning the PDM lock. * * @returns @c true if the lock is taken, @c false otherwise. * @param pVM The cross context VM structure. */ bool pdmLockIsOwner(PVMCC pVM) { return PDMCritSectIsOwner(pVM, &pVM->pdm.s.CritSect); } /** * Converts ring 3 VMM heap pointer to a guest physical address * * @returns VBox status code. * @param pVM The cross context VM structure. * @param pv Ring-3 pointer. * @param pGCPhys GC phys address (out). */ VMM_INT_DECL(int) PDMVmmDevHeapR3ToGCPhys(PVM pVM, RTR3PTR pv, RTGCPHYS *pGCPhys) { if (RT_LIKELY(pVM->pdm.s.GCPhysVMMDevHeap != NIL_RTGCPHYS)) { RTR3UINTPTR const offHeap = (RTR3UINTPTR)pv - (RTR3UINTPTR)pVM->pdm.s.pvVMMDevHeap; if (RT_LIKELY(offHeap < pVM->pdm.s.cbVMMDevHeap)) { *pGCPhys = pVM->pdm.s.GCPhysVMMDevHeap + offHeap; return VINF_SUCCESS; } /* Don't assert here as this is called before we can catch ring-0 assertions. */ Log(("PDMVmmDevHeapR3ToGCPhys: pv=%p pvVMMDevHeap=%p cbVMMDevHeap=%#x\n", pv, pVM->pdm.s.pvVMMDevHeap, pVM->pdm.s.cbVMMDevHeap)); } else Log(("PDMVmmDevHeapR3ToGCPhys: GCPhysVMMDevHeap=%RGp (pv=%p)\n", pVM->pdm.s.GCPhysVMMDevHeap, pv)); return VERR_PDM_DEV_HEAP_R3_TO_GCPHYS; } /** * Checks if the vmm device heap is enabled (== vmm device's pci region mapped) * * @returns dev heap enabled status (true/false) * @param pVM The cross context VM structure. */ VMM_INT_DECL(bool) PDMVmmDevHeapIsEnabled(PVM pVM) { return pVM->pdm.s.GCPhysVMMDevHeap != NIL_RTGCPHYS; }