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Diffstat (limited to 'src/VBox/VMM/VMMAll/GIMAll.cpp')
| -rw-r--r-- | src/VBox/VMM/VMMAll/GIMAll.cpp | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/src/VBox/VMM/VMMAll/GIMAll.cpp b/src/VBox/VMM/VMMAll/GIMAll.cpp new file mode 100644 index 00000000..83716f9c --- /dev/null +++ b/src/VBox/VMM/VMMAll/GIMAll.cpp @@ -0,0 +1,492 @@ +/* $Id: GIMAll.cpp $ */ +/** @file + * GIM - Guest Interface Manager - All Contexts. + */ + +/* + * Copyright (C) 2014-2020 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_GIM +#include <VBox/vmm/gim.h> +#include <VBox/vmm/em.h> /* For EMInterpretDisasCurrent */ +#include "GIMInternal.h" +#include <VBox/vmm/vmcc.h> + +#include <VBox/dis.h> /* For DISCPUSTATE */ +#include <VBox/err.h> +#include <iprt/string.h> + +/* Include all the providers. */ +#include "GIMHvInternal.h" +#include "GIMMinimalInternal.h" + + +/** + * Checks whether GIM is being used by this VM. + * + * @retval true if used. + * @retval false if no GIM provider ("none") is used. + * + * @param pVM The cross context VM structure. + */ +VMMDECL(bool) GIMIsEnabled(PVM pVM) +{ + return pVM->gim.s.enmProviderId != GIMPROVIDERID_NONE; +} + + +/** + * Gets the GIM provider configured for this VM. + * + * @returns The GIM provider Id. + * @param pVM The cross context VM structure. + */ +VMMDECL(GIMPROVIDERID) GIMGetProvider(PVM pVM) +{ + return pVM->gim.s.enmProviderId; +} + + +/** + * Returns the array of MMIO2 regions that are expected to be registered and + * later mapped into the guest-physical address space for the GIM provider + * configured for the VM. + * + * @returns Pointer to an array of GIM MMIO2 regions, may return NULL. + * @param pVM The cross context VM structure. + * @param pcRegions Where to store the number of items in the array. + * + * @remarks The caller does not own and therefore must -NOT- try to free the + * returned pointer. + */ +VMMDECL(PGIMMMIO2REGION) GIMGetMmio2Regions(PVMCC pVM, uint32_t *pcRegions) +{ + Assert(pVM); + Assert(pcRegions); + + *pcRegions = 0; + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_HYPERV: + return gimHvGetMmio2Regions(pVM, pcRegions); + + default: + break; + } + + return NULL; +} + + +/** + * Returns whether the guest has configured and enabled calls to the hypervisor. + * + * @returns true if hypercalls are enabled and usable, false otherwise. + * @param pVCpu The cross context virtual CPU structure. + */ +VMM_INT_DECL(bool) GIMAreHypercallsEnabled(PVMCPUCC pVCpu) +{ + PVM pVM = pVCpu->CTX_SUFF(pVM); + if (!GIMIsEnabled(pVM)) + return false; + + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_HYPERV: + return gimHvAreHypercallsEnabled(pVM); + + case GIMPROVIDERID_KVM: + return gimKvmAreHypercallsEnabled(pVCpu); + + default: + return false; + } +} + + +/** + * Implements a GIM hypercall with the provider configured for the VM. + * + * @returns Strict VBox status code. + * @retval VINF_SUCCESS if the hypercall succeeded (even if its operation + * failed). + * @retval VINF_GIM_HYPERCALL_CONTINUING continue hypercall without updating + * RIP. + * @retval VINF_GIM_R3_HYPERCALL re-start the hypercall from ring-3. + * @retval VERR_GIM_HYPERCALL_ACCESS_DENIED CPL is insufficient. + * @retval VERR_GIM_HYPERCALLS_NOT_AVAILABLE hypercalls unavailable. + * @retval VERR_GIM_NOT_ENABLED GIM is not enabled (shouldn't really happen) + * @retval VERR_GIM_HYPERCALL_MEMORY_READ_FAILED hypercall failed while reading + * memory. + * @retval VERR_GIM_HYPERCALL_MEMORY_WRITE_FAILED hypercall failed while + * writing memory. + * + * @param pVCpu The cross context virtual CPU structure. + * @param pCtx Pointer to the guest-CPU context. + * + * @remarks The caller of this function needs to advance RIP as required. + * @thread EMT. + */ +VMM_INT_DECL(VBOXSTRICTRC) GIMHypercall(PVMCPUCC pVCpu, PCPUMCTX pCtx) +{ + PVMCC pVM = pVCpu->CTX_SUFF(pVM); + VMCPU_ASSERT_EMT(pVCpu); + + if (RT_UNLIKELY(!GIMIsEnabled(pVM))) + return VERR_GIM_NOT_ENABLED; + + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_HYPERV: + return gimHvHypercall(pVCpu, pCtx); + + case GIMPROVIDERID_KVM: + return gimKvmHypercall(pVCpu, pCtx); + + default: + AssertMsgFailed(("GIMHypercall: for provider %u not available/implemented\n", pVM->gim.s.enmProviderId)); + return VERR_GIM_HYPERCALLS_NOT_AVAILABLE; + } +} + + +/** + * Same as GIMHypercall, except with disassembler opcode and instruction length. + * + * This is the interface used by IEM. + * + * @returns Strict VBox status code. + * @retval VINF_SUCCESS if the hypercall succeeded (even if its operation + * failed). + * @retval VINF_GIM_HYPERCALL_CONTINUING continue hypercall without updating + * RIP. + * @retval VINF_GIM_R3_HYPERCALL re-start the hypercall from ring-3. + * @retval VERR_GIM_HYPERCALL_ACCESS_DENIED CPL is insufficient. + * @retval VERR_GIM_HYPERCALLS_NOT_AVAILABLE hypercalls unavailable. + * @retval VERR_GIM_NOT_ENABLED GIM is not enabled (shouldn't really happen) + * @retval VERR_GIM_HYPERCALL_MEMORY_READ_FAILED hypercall failed while reading + * memory. + * @retval VERR_GIM_HYPERCALL_MEMORY_WRITE_FAILED hypercall failed while + * writing memory. + * @retval VERR_GIM_INVALID_HYPERCALL_INSTR if uDisOpcode is the wrong one; raise \#UD. + * + * @param pVCpu The cross context virtual CPU structure. + * @param pCtx Pointer to the guest-CPU context. + * @param uDisOpcode The disassembler opcode. + * @param cbInstr The instruction length. + * + * @remarks The caller of this function needs to advance RIP as required. + * @thread EMT. + */ +VMM_INT_DECL(VBOXSTRICTRC) GIMHypercallEx(PVMCPUCC pVCpu, PCPUMCTX pCtx, unsigned uDisOpcode, uint8_t cbInstr) +{ + PVMCC pVM = pVCpu->CTX_SUFF(pVM); + VMCPU_ASSERT_EMT(pVCpu); + + if (RT_UNLIKELY(!GIMIsEnabled(pVM))) + return VERR_GIM_NOT_ENABLED; + + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_HYPERV: + return gimHvHypercallEx(pVCpu, pCtx, uDisOpcode, cbInstr); + + case GIMPROVIDERID_KVM: + return gimKvmHypercallEx(pVCpu, pCtx, uDisOpcode, cbInstr); + + default: + AssertMsgFailedReturn(("enmProviderId=%u\n", pVM->gim.s.enmProviderId), VERR_GIM_HYPERCALLS_NOT_AVAILABLE); + } +} + + +/** + * Disassembles the instruction at RIP and if it's a hypercall + * instruction, performs the hypercall. + * + * @param pVCpu The cross context virtual CPU structure. + * @param pCtx Pointer to the guest-CPU context. + * @param pcbInstr Where to store the disassembled instruction length. + * Optional, can be NULL. + * + * @todo This interface should disappear when IEM/REM execution engines + * handle VMCALL/VMMCALL instructions to call into GIM when + * required. See @bugref{7270#c168}. + */ +VMM_INT_DECL(VBOXSTRICTRC) GIMExecHypercallInstr(PVMCPUCC pVCpu, PCPUMCTX pCtx, uint8_t *pcbInstr) +{ + PVMCC pVM = pVCpu->CTX_SUFF(pVM); + VMCPU_ASSERT_EMT(pVCpu); + + if (RT_UNLIKELY(!GIMIsEnabled(pVM))) + return VERR_GIM_NOT_ENABLED; + + unsigned cbInstr; + DISCPUSTATE Dis; + int rc = EMInterpretDisasCurrent(pVM, pVCpu, &Dis, &cbInstr); + if (RT_SUCCESS(rc)) + { + if (pcbInstr) + *pcbInstr = (uint8_t)cbInstr; + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_HYPERV: + return gimHvHypercallEx(pVCpu, pCtx, Dis.pCurInstr->uOpcode, Dis.cbInstr); + + case GIMPROVIDERID_KVM: + return gimKvmHypercallEx(pVCpu, pCtx, Dis.pCurInstr->uOpcode, Dis.cbInstr); + + default: + AssertMsgFailed(("GIMExecHypercallInstr: for provider %u not available/implemented\n", pVM->gim.s.enmProviderId)); + return VERR_GIM_HYPERCALLS_NOT_AVAILABLE; + } + } + + Log(("GIM: GIMExecHypercallInstr: Failed to disassemble CS:RIP=%04x:%08RX64. rc=%Rrc\n", pCtx->cs.Sel, pCtx->rip, rc)); + return rc; +} + + +/** + * Returns whether the guest has configured and setup the use of paravirtualized + * TSC. + * + * Paravirtualized TSCs are per-VM and the rest of the execution engine logic + * relies on that. + * + * @returns true if enabled and usable, false otherwise. + * @param pVM The cross context VM structure. + */ +VMM_INT_DECL(bool) GIMIsParavirtTscEnabled(PVMCC pVM) +{ + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_HYPERV: + return gimHvIsParavirtTscEnabled(pVM); + + case GIMPROVIDERID_KVM: + return gimKvmIsParavirtTscEnabled(pVM); + + default: + break; + } + return false; +} + + +/** + * Whether \#UD exceptions in the guest needs to be intercepted by the GIM + * provider. + * + * At the moment, the reason why this isn't a more generic interface wrt to + * exceptions is because of performance (each VM-exit would have to manually + * check whether or not GIM needs to be notified). Left as a todo for later if + * really required. + * + * @returns true if needed, false otherwise. + * @param pVCpu The cross context virtual CPU structure. + */ +VMM_INT_DECL(bool) GIMShouldTrapXcptUD(PVMCPUCC pVCpu) +{ + PVM pVM = pVCpu->CTX_SUFF(pVM); + if (!GIMIsEnabled(pVM)) + return false; + + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_KVM: + return gimKvmShouldTrapXcptUD(pVM); + + case GIMPROVIDERID_HYPERV: + return gimHvShouldTrapXcptUD(pVCpu); + + default: + return false; + } +} + + +/** + * Exception handler for \#UD when requested by the GIM provider. + * + * @returns Strict VBox status code. + * @retval VINF_SUCCESS if the hypercall succeeded (even if its operation + * failed). + * @retval VINF_GIM_R3_HYPERCALL restart the hypercall from ring-3. + * @retval VINF_GIM_HYPERCALL_CONTINUING continue hypercall without updating + * RIP. + * @retval VERR_GIM_HYPERCALL_ACCESS_DENIED CPL is insufficient. + * @retval VERR_GIM_INVALID_HYPERCALL_INSTR instruction at RIP is not a valid + * hypercall instruction. + * + * @param pVCpu The cross context virtual CPU structure. + * @param pCtx Pointer to the guest-CPU context. + * @param pDis Pointer to the disassembled instruction state at RIP. + * If NULL is passed, it implies the disassembly of the + * the instruction at RIP is the responsibility of the + * GIM provider. + * @param pcbInstr Where to store the instruction length of the hypercall + * instruction. Optional, can be NULL. + * + * @thread EMT(pVCpu). + */ +VMM_INT_DECL(VBOXSTRICTRC) GIMXcptUD(PVMCPUCC pVCpu, PCPUMCTX pCtx, PDISCPUSTATE pDis, uint8_t *pcbInstr) +{ + PVMCC pVM = pVCpu->CTX_SUFF(pVM); + Assert(GIMIsEnabled(pVM)); + Assert(pDis || pcbInstr); + + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_KVM: + return gimKvmXcptUD(pVM, pVCpu, pCtx, pDis, pcbInstr); + + case GIMPROVIDERID_HYPERV: + return gimHvXcptUD(pVCpu, pCtx, pDis, pcbInstr); + + default: + return VERR_GIM_OPERATION_FAILED; + } +} + + +/** + * Invokes the read-MSR handler for the GIM provider configured for the VM. + * + * @returns Strict VBox status code like CPUMQueryGuestMsr. + * @retval VINF_CPUM_R3_MSR_READ + * @retval VERR_CPUM_RAISE_GP_0 + * + * @param pVCpu The cross context virtual CPU structure. + * @param idMsr The MSR to read. + * @param pRange The range this MSR belongs to. + * @param puValue Where to store the MSR value read. + */ +VMM_INT_DECL(VBOXSTRICTRC) GIMReadMsr(PVMCPUCC pVCpu, uint32_t idMsr, PCCPUMMSRRANGE pRange, uint64_t *puValue) +{ + Assert(pVCpu); + PVMCC pVM = pVCpu->CTX_SUFF(pVM); + Assert(GIMIsEnabled(pVM)); + VMCPU_ASSERT_EMT(pVCpu); + + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_HYPERV: + return gimHvReadMsr(pVCpu, idMsr, pRange, puValue); + + case GIMPROVIDERID_KVM: + return gimKvmReadMsr(pVCpu, idMsr, pRange, puValue); + + default: + AssertMsgFailed(("GIMReadMsr: for unknown provider %u idMsr=%#RX32 -> #GP(0)", pVM->gim.s.enmProviderId, idMsr)); + return VERR_CPUM_RAISE_GP_0; + } +} + + +/** + * Invokes the write-MSR handler for the GIM provider configured for the VM. + * + * @returns Strict VBox status code like CPUMSetGuestMsr. + * @retval VINF_CPUM_R3_MSR_WRITE + * @retval VERR_CPUM_RAISE_GP_0 + * + * @param pVCpu The cross context virtual CPU structure. + * @param idMsr The MSR to write. + * @param pRange The range this MSR belongs to. + * @param uValue The value to set, ignored bits masked. + * @param uRawValue The raw value with the ignored bits not masked. + */ +VMM_INT_DECL(VBOXSTRICTRC) GIMWriteMsr(PVMCPUCC pVCpu, uint32_t idMsr, PCCPUMMSRRANGE pRange, uint64_t uValue, uint64_t uRawValue) +{ + AssertPtr(pVCpu); + NOREF(uValue); + + PVMCC pVM = pVCpu->CTX_SUFF(pVM); + Assert(GIMIsEnabled(pVM)); + VMCPU_ASSERT_EMT(pVCpu); + + switch (pVM->gim.s.enmProviderId) + { + case GIMPROVIDERID_HYPERV: + return gimHvWriteMsr(pVCpu, idMsr, pRange, uRawValue); + + case GIMPROVIDERID_KVM: + return gimKvmWriteMsr(pVCpu, idMsr, pRange, uRawValue); + + default: + AssertMsgFailed(("GIMWriteMsr: for unknown provider %u idMsr=%#RX32 -> #GP(0)", pVM->gim.s.enmProviderId, idMsr)); + return VERR_CPUM_RAISE_GP_0; + } +} + + +/** + * Queries the opcode bytes for a native hypercall. + * + * @returns VBox status code. + * @param pVM The cross context VM structure. + * @param pvBuf The destination buffer. + * @param cbBuf The size of the buffer. + * @param pcbWritten Where to return the number of bytes written. This is + * reliably updated only on successful return. Optional. + * @param puDisOpcode Where to return the disassembler opcode. Optional. + */ +VMM_INT_DECL(int) GIMQueryHypercallOpcodeBytes(PVM pVM, void *pvBuf, size_t cbBuf, size_t *pcbWritten, uint16_t *puDisOpcode) +{ + AssertPtrReturn(pvBuf, VERR_INVALID_POINTER); + + CPUMCPUVENDOR enmHostCpu = CPUMGetHostCpuVendor(pVM); + uint8_t const *pbSrc; + size_t cbSrc; + switch (enmHostCpu) + { + case CPUMCPUVENDOR_AMD: + case CPUMCPUVENDOR_HYGON: + { + if (puDisOpcode) + *puDisOpcode = OP_VMMCALL; + static uint8_t const s_abHypercall[] = { 0x0F, 0x01, 0xD9 }; /* VMMCALL */ + pbSrc = s_abHypercall; + cbSrc = sizeof(s_abHypercall); + break; + } + + case CPUMCPUVENDOR_INTEL: + case CPUMCPUVENDOR_VIA: + case CPUMCPUVENDOR_SHANGHAI: + { + if (puDisOpcode) + *puDisOpcode = OP_VMCALL; + static uint8_t const s_abHypercall[] = { 0x0F, 0x01, 0xC1 }; /* VMCALL */ + pbSrc = s_abHypercall; + cbSrc = sizeof(s_abHypercall); + break; + } + + default: + AssertMsgFailedReturn(("%d\n", enmHostCpu), VERR_UNSUPPORTED_CPU); + } + if (RT_LIKELY(cbBuf >= cbSrc)) + { + memcpy(pvBuf, pbSrc, cbSrc); + if (pcbWritten) + *pcbWritten = cbSrc; + return VINF_SUCCESS; + } + return VERR_BUFFER_OVERFLOW; +} + |