Introduce the WHPX impl

Implements the Windows Hypervisor Platform accelerator (WHPX) target. Which
acts as a hypervisor accelerator for QEMU on the Windows platform. This enables
QEMU much greater speed over the emulated x86_64 path's that are taken on
Windows today.

1. Adds support for vPartition management.
2. Adds support for vCPU management.
3. Adds support for MMIO/PortIO.
4. Registers the WHPX ACCEL_CLASS.

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>
Message-Id: <1516655269-1785-4-git-send-email-juterry@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 1367 insertions, 0 deletions

diff --git a/target/i386/Makefile.objs b/target/i386/Makefile.objs
index 44103a693b..f5c6ef20a7 100644
--- a/target/i386/Makefile.objs
+++ b/target/i386/Makefile.objs
@@ -14,3 +14,4 @@ ifdef CONFIG_DARWIN
 obj-$(CONFIG_HAX) += hax-all.o hax-mem.o hax-darwin.o
 obj-$(CONFIG_HVF) += hvf/
 endif
+obj-$(CONFIG_WHPX) += whpx-all.o
diff --git a/target/i386/whpx-all.c b/target/i386/whpx-all.c
new file mode 100644
index 0000000000..0015b27509
--- /dev/null
+++ b/target/i386/whpx-all.c
@@ -0,0 +1,1366 @@
+/*
+ * QEMU Windows Hypervisor Platform accelerator (WHPX)
+ *
+ * Copyright Microsoft Corp. 2017
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/address-spaces.h"
+#include "exec/exec-all.h"
+#include "exec/ioport.h"
+#include "qemu-common.h"
+#include "strings.h"
+#include "sysemu/accel.h"
+#include "sysemu/whpx.h"
+#include "sysemu/sysemu.h"
+#include "sysemu/cpus.h"
+#include "qemu/main-loop.h"
+#include "hw/boards.h"
+#include "qemu/error-report.h"
+#include "qemu/queue.h"
+#include "qapi/error.h"
+#include "migration/blocker.h"
+
+#include <winhvplatform.h>
+#include <winhvemulation.h>
+
+struct whpx_state {
+    uint64_t mem_quota;
+    WHV_PARTITION_HANDLE partition;
+    uint32_t exit_ctx_size;
+};
+
+static const WHV_REGISTER_NAME whpx_register_names[] = {
+
+    /* X64 General purpose registers */
+    WHvX64RegisterRax,
+    WHvX64RegisterRcx,
+    WHvX64RegisterRdx,
+    WHvX64RegisterRbx,
+    WHvX64RegisterRsp,
+    WHvX64RegisterRbp,
+    WHvX64RegisterRsi,
+    WHvX64RegisterRdi,
+    WHvX64RegisterR8,
+    WHvX64RegisterR9,
+    WHvX64RegisterR10,
+    WHvX64RegisterR11,
+    WHvX64RegisterR12,
+    WHvX64RegisterR13,
+    WHvX64RegisterR14,
+    WHvX64RegisterR15,
+    WHvX64RegisterRip,
+    WHvX64RegisterRflags,
+
+    /* X64 Segment registers */
+    WHvX64RegisterEs,
+    WHvX64RegisterCs,
+    WHvX64RegisterSs,
+    WHvX64RegisterDs,
+    WHvX64RegisterFs,
+    WHvX64RegisterGs,
+    WHvX64RegisterLdtr,
+    WHvX64RegisterTr,
+
+    /* X64 Table registers */
+    WHvX64RegisterIdtr,
+    WHvX64RegisterGdtr,
+
+    /* X64 Control Registers */
+    WHvX64RegisterCr0,
+    WHvX64RegisterCr2,
+    WHvX64RegisterCr3,
+    WHvX64RegisterCr4,
+    WHvX64RegisterCr8,
+
+    /* X64 Debug Registers */
+    /*
+     * WHvX64RegisterDr0,
+     * WHvX64RegisterDr1,
+     * WHvX64RegisterDr2,
+     * WHvX64RegisterDr3,
+     * WHvX64RegisterDr6,
+     * WHvX64RegisterDr7,
+     */
+
+    /* X64 Floating Point and Vector Registers */
+    WHvX64RegisterXmm0,
+    WHvX64RegisterXmm1,
+    WHvX64RegisterXmm2,
+    WHvX64RegisterXmm3,
+    WHvX64RegisterXmm4,
+    WHvX64RegisterXmm5,
+    WHvX64RegisterXmm6,
+    WHvX64RegisterXmm7,
+    WHvX64RegisterXmm8,
+    WHvX64RegisterXmm9,
+    WHvX64RegisterXmm10,
+    WHvX64RegisterXmm11,
+    WHvX64RegisterXmm12,
+    WHvX64RegisterXmm13,
+    WHvX64RegisterXmm14,
+    WHvX64RegisterXmm15,
+    WHvX64RegisterFpMmx0,
+    WHvX64RegisterFpMmx1,
+    WHvX64RegisterFpMmx2,
+    WHvX64RegisterFpMmx3,
+    WHvX64RegisterFpMmx4,
+    WHvX64RegisterFpMmx5,
+    WHvX64RegisterFpMmx6,
+    WHvX64RegisterFpMmx7,
+    WHvX64RegisterFpControlStatus,
+    WHvX64RegisterXmmControlStatus,
+
+    /* X64 MSRs */
+    WHvX64RegisterTsc,
+    WHvX64RegisterEfer,
+#ifdef TARGET_X86_64
+    WHvX64RegisterKernelGsBase,
+#endif
+    WHvX64RegisterApicBase,
+    /* WHvX64RegisterPat, */
+    WHvX64RegisterSysenterCs,
+    WHvX64RegisterSysenterEip,
+    WHvX64RegisterSysenterEsp,
+    WHvX64RegisterStar,
+#ifdef TARGET_X86_64
+    WHvX64RegisterLstar,
+    WHvX64RegisterCstar,
+    WHvX64RegisterSfmask,
+#endif
+
+    /* Interrupt / Event Registers */
+    /*
+     * WHvRegisterPendingInterruption,
+     * WHvRegisterInterruptState,
+     * WHvRegisterPendingEvent0,
+     * WHvRegisterPendingEvent1
+     * WHvX64RegisterDeliverabilityNotifications,
+     */
+};
+
+struct whpx_register_set {
+    WHV_REGISTER_VALUE values[RTL_NUMBER_OF(whpx_register_names)];
+};
+
+struct whpx_vcpu {
+    WHV_EMULATOR_HANDLE emulator;
+    bool window_registered;
+    bool interruptable;
+    uint64_t tpr;
+    uint64_t apic_base;
+    WHV_X64_PENDING_INTERRUPTION_REGISTER interrupt_in_flight;
+
+    /* Must be the last field as it may have a tail */
+    WHV_RUN_VP_EXIT_CONTEXT exit_ctx;
+};
+
+static bool whpx_allowed;
+
+struct whpx_state whpx_global;
+
+
+/*
+ * VP support
+ */
+
+static struct whpx_vcpu *get_whpx_vcpu(CPUState *cpu)
+{
+    return (struct whpx_vcpu *)cpu->hax_vcpu;
+}
+
+static WHV_X64_SEGMENT_REGISTER whpx_seg_q2h(const SegmentCache *qs, int v86,
+                                             int r86)
+{
+    WHV_X64_SEGMENT_REGISTER hs;
+    unsigned flags = qs->flags;
+
+    hs.Base = qs->base;
+    hs.Limit = qs->limit;
+    hs.Selector = qs->selector;
+
+    if (v86) {
+        hs.Attributes = 0;
+        hs.SegmentType = 3;
+        hs.Present = 1;
+        hs.DescriptorPrivilegeLevel = 3;
+        hs.NonSystemSegment = 1;
+
+    } else {
+        hs.Attributes = (flags >> DESC_TYPE_SHIFT);
+
+        if (r86) {
+            /* hs.Base &= 0xfffff; */
+        }
+    }
+
+    return hs;
+}
+
+static SegmentCache whpx_seg_h2q(const WHV_X64_SEGMENT_REGISTER *hs)
+{
+    SegmentCache qs;
+
+    qs.base = hs->Base;
+    qs.limit = hs->Limit;
+    qs.selector = hs->Selector;
+
+    qs.flags = ((uint32_t)hs->Attributes) << DESC_TYPE_SHIFT;
+
+    return qs;
+}
+
+static void whpx_set_registers(CPUState *cpu)
+{
+    struct whpx_state *whpx = &whpx_global;
+    struct whpx_vcpu *vcpu = get_whpx_vcpu(cpu);
+    struct CPUX86State *env = (CPUArchState *)(cpu->env_ptr);
+    X86CPU *x86_cpu = X86_CPU(cpu);
+    struct whpx_register_set vcxt = {0};
+    HRESULT hr;
+    int idx = 0;
+    int i;
+    int v86, r86;
+
+    assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu));
+
+    v86 = (env->eflags & VM_MASK);
+    r86 = !(env->cr[0] & CR0_PE_MASK);
+
+    vcpu->tpr = cpu_get_apic_tpr(x86_cpu->apic_state);
+    vcpu->apic_base = cpu_get_apic_base(x86_cpu->apic_state);
+
+    /* Indexes for first 16 registers match between HV and QEMU definitions */
+    for (idx = 0; idx < CPU_NB_REGS64; idx += 1) {
+        vcxt.values[idx].Reg64 = env->regs[idx];
+    }
+
+    /* Same goes for RIP and RFLAGS */
+    assert(whpx_register_names[idx] == WHvX64RegisterRip);
+    vcxt.values[idx++].Reg64 = env->eip;
+
+    assert(whpx_register_names[idx] == WHvX64RegisterRflags);
+    vcxt.values[idx++].Reg64 = env->eflags;
+
+    /* Translate 6+4 segment registers. HV and QEMU order matches  */
+    assert(idx == WHvX64RegisterEs);
+    for (i = 0; i < 6; i += 1, idx += 1) {
+        vcxt.values[idx].Segment = whpx_seg_q2h(&env->segs[i], v86, r86);
+    }
+
+    assert(idx == WHvX64RegisterLdtr);
+    vcxt.values[idx++].Segment = whpx_seg_q2h(&env->ldt, 0, 0);
+
+    assert(idx == WHvX64RegisterTr);
+    vcxt.values[idx++].Segment = whpx_seg_q2h(&env->tr, 0, 0);
+
+    assert(idx == WHvX64RegisterIdtr);
+    vcxt.values[idx].Table.Base = env->idt.base;
+    vcxt.values[idx].Table.Limit = env->idt.limit;
+    idx += 1;
+
+    assert(idx == WHvX64RegisterGdtr);
+    vcxt.values[idx].Table.Base = env->gdt.base;
+    vcxt.values[idx].Table.Limit = env->gdt.limit;
+    idx += 1;
+
+    /* CR0, 2, 3, 4, 8 */
+    assert(whpx_register_names[idx] == WHvX64RegisterCr0);
+    vcxt.values[idx++].Reg64 = env->cr[0];
+    assert(whpx_register_names[idx] == WHvX64RegisterCr2);
+    vcxt.values[idx++].Reg64 = env->cr[2];
+    assert(whpx_register_names[idx] == WHvX64RegisterCr3);
+    vcxt.values[idx++].Reg64 = env->cr[3];
+    assert(whpx_register_names[idx] == WHvX64RegisterCr4);
+    vcxt.values[idx++].Reg64 = env->cr[4];
+    assert(whpx_register_names[idx] == WHvX64RegisterCr8);
+    vcxt.values[idx++].Reg64 = vcpu->tpr;
+
+    /* 8 Debug Registers - Skipped */
+
+    /* 16 XMM registers */
+    assert(whpx_register_names[idx] == WHvX64RegisterXmm0);
+    for (i = 0; i < 16; i += 1, idx += 1) {
+        vcxt.values[idx].Reg128.Low64 = env->xmm_regs[i].ZMM_Q(0);
+        vcxt.values[idx].Reg128.High64 = env->xmm_regs[i].ZMM_Q(1);
+    }
+
+    /* 8 FP registers */
+    assert(whpx_register_names[idx] == WHvX64RegisterFpMmx0);
+    for (i = 0; i < 8; i += 1, idx += 1) {
+        vcxt.values[idx].Fp.AsUINT128.Low64 = env->fpregs[i].mmx.MMX_Q(0);
+        /* vcxt.values[idx].Fp.AsUINT128.High64 =
+               env->fpregs[i].mmx.MMX_Q(1);
+        */
+    }
+
+    /* FP control status register */
+    assert(whpx_register_names[idx] == WHvX64RegisterFpControlStatus);
+    vcxt.values[idx].FpControlStatus.FpControl = env->fpuc;
+    vcxt.values[idx].FpControlStatus.FpStatus =
+        (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
+    vcxt.values[idx].FpControlStatus.FpTag = 0;
+    for (i = 0; i < 8; ++i) {
+        vcxt.values[idx].FpControlStatus.FpTag |= (!env->fptags[i]) << i;
+    }
+    vcxt.values[idx].FpControlStatus.Reserved = 0;
+    vcxt.values[idx].FpControlStatus.LastFpOp = env->fpop;
+    vcxt.values[idx].FpControlStatus.LastFpRip = env->fpip;
+    idx += 1;
+
+    /* XMM control status register */
+    assert(whpx_register_names[idx] == WHvX64RegisterXmmControlStatus);
+    vcxt.values[idx].XmmControlStatus.LastFpRdp = 0;
+    vcxt.values[idx].XmmControlStatus.XmmStatusControl = env->mxcsr;
+    vcxt.values[idx].XmmControlStatus.XmmStatusControlMask = 0x0000ffff;
+    idx += 1;
+
+    /* MSRs */
+    assert(whpx_register_names[idx] == WHvX64RegisterTsc);
+    vcxt.values[idx++].Reg64 = env->tsc;
+    assert(whpx_register_names[idx] == WHvX64RegisterEfer);
+    vcxt.values[idx++].Reg64 = env->efer;
+#ifdef TARGET_X86_64
+    assert(whpx_register_names[idx] == WHvX64RegisterKernelGsBase);
+    vcxt.values[idx++].Reg64 = env->kernelgsbase;
+#endif
+
+    assert(whpx_register_names[idx] == WHvX64RegisterApicBase);
+    vcxt.values[idx++].Reg64 = vcpu->apic_base;
+
+    /* WHvX64RegisterPat - Skipped */
+
+    assert(whpx_register_names[idx] == WHvX64RegisterSysenterCs);
+    vcxt.values[idx++].Reg64 = env->sysenter_cs;
+    assert(whpx_register_names[idx] == WHvX64RegisterSysenterEip);
+    vcxt.values[idx++].Reg64 = env->sysenter_eip;
+    assert(whpx_register_names[idx] == WHvX64RegisterSysenterEsp);
+    vcxt.values[idx++].Reg64 = env->sysenter_esp;
+    assert(whpx_register_names[idx] == WHvX64RegisterStar);
+    vcxt.values[idx++].Reg64 = env->star;
+#ifdef TARGET_X86_64
+    assert(whpx_register_names[idx] == WHvX64RegisterLstar);
+    vcxt.values[idx++].Reg64 = env->lstar;
+    assert(whpx_register_names[idx] == WHvX64RegisterCstar);
+    vcxt.values[idx++].Reg64 = env->cstar;
+    assert(whpx_register_names[idx] == WHvX64RegisterSfmask);
+    vcxt.values[idx++].Reg64 = env->fmask;
+#endif
+
+    /* Interrupt / Event Registers - Skipped */
+
+    assert(idx == RTL_NUMBER_OF(whpx_register_names));
+
+    hr = WHvSetVirtualProcessorRegisters(whpx->partition, cpu->cpu_index,
+                                         whpx_register_names,
+                                         RTL_NUMBER_OF(whpx_register_names),
+                                         &vcxt.values[0]);
+
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to set virtual processor context, hr=%08lx",
+                     hr);
+        __debugbreak();
+    }
+
+    return;
+}
+
+static void whpx_get_registers(CPUState *cpu)
+{
+    struct whpx_state *whpx = &whpx_global;
+    struct whpx_vcpu *vcpu = get_whpx_vcpu(cpu);
+    struct CPUX86State *env = (CPUArchState *)(cpu->env_ptr);
+    X86CPU *x86_cpu = X86_CPU(cpu);
+    struct whpx_register_set vcxt;
+    uint64_t tpr, apic_base;
+    HRESULT hr;
+    int idx = 0;
+    int i;
+
+    assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu));
+
+    hr = WHvGetVirtualProcessorRegisters(whpx->partition, cpu->cpu_index,
+                                         whpx_register_names,
+                                         RTL_NUMBER_OF(whpx_register_names),
+                                         &vcxt.values[0]);
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to get virtual processor context, hr=%08lx",
+                     hr);
+        __debugbreak();
+    }
+
+    /* Indexes for first 16 registers match between HV and QEMU definitions */
+    for (idx = 0; idx < CPU_NB_REGS64; idx += 1) {
+        env->regs[idx] = vcxt.values[idx].Reg64;
+    }
+
+    /* Same goes for RIP and RFLAGS */
+    assert(whpx_register_names[idx] == WHvX64RegisterRip);
+    env->eip = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterRflags);
+    env->eflags = vcxt.values[idx++].Reg64;
+
+    /* Translate 6+4 segment registers. HV and QEMU order matches  */
+    assert(idx == WHvX64RegisterEs);
+    for (i = 0; i < 6; i += 1, idx += 1) {
+        env->segs[i] = whpx_seg_h2q(&vcxt.values[idx].Segment);
+    }
+
+    assert(idx == WHvX64RegisterLdtr);
+    env->ldt = whpx_seg_h2q(&vcxt.values[idx++].Segment);
+    assert(idx == WHvX64RegisterTr);
+    env->tr = whpx_seg_h2q(&vcxt.values[idx++].Segment);
+    assert(idx == WHvX64RegisterIdtr);
+    env->idt.base = vcxt.values[idx].Table.Base;
+    env->idt.limit = vcxt.values[idx].Table.Limit;
+    idx += 1;
+    assert(idx == WHvX64RegisterGdtr);
+    env->gdt.base = vcxt.values[idx].Table.Base;
+    env->gdt.limit = vcxt.values[idx].Table.Limit;
+    idx += 1;
+
+    /* CR0, 2, 3, 4, 8 */
+    assert(whpx_register_names[idx] == WHvX64RegisterCr0);
+    env->cr[0] = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterCr2);
+    env->cr[2] = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterCr3);
+    env->cr[3] = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterCr4);
+    env->cr[4] = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterCr8);
+    tpr = vcxt.values[idx++].Reg64;
+    if (tpr != vcpu->tpr) {
+        vcpu->tpr = tpr;
+        cpu_set_apic_tpr(x86_cpu->apic_state, tpr);
+    }
+
+    /* 8 Debug Registers - Skipped */
+
+    /* 16 XMM registers */
+    assert(whpx_register_names[idx] == WHvX64RegisterXmm0);
+    for (i = 0; i < 16; i += 1, idx += 1) {
+        env->xmm_regs[i].ZMM_Q(0) = vcxt.values[idx].Reg128.Low64;
+        env->xmm_regs[i].ZMM_Q(1) = vcxt.values[idx].Reg128.High64;
+    }
+
+    /* 8 FP registers */
+    assert(whpx_register_names[idx] == WHvX64RegisterFpMmx0);
+    for (i = 0; i < 8; i += 1, idx += 1) {
+        env->fpregs[i].mmx.MMX_Q(0) = vcxt.values[idx].Fp.AsUINT128.Low64;
+        /* env->fpregs[i].mmx.MMX_Q(1) =
+               vcxt.values[idx].Fp.AsUINT128.High64;
+        */
+    }
+
+    /* FP control status register */
+    assert(whpx_register_names[idx] == WHvX64RegisterFpControlStatus);
+    env->fpuc = vcxt.values[idx].FpControlStatus.FpControl;
+    env->fpstt = (vcxt.values[idx].FpControlStatus.FpStatus >> 11) & 0x7;
+    env->fpus = vcxt.values[idx].FpControlStatus.FpStatus & ~0x3800;
+    for (i = 0; i < 8; ++i) {
+        env->fptags[i] = !((vcxt.values[idx].FpControlStatus.FpTag >> i) & 1);
+    }
+    env->fpop = vcxt.values[idx].FpControlStatus.LastFpOp;
+    env->fpip = vcxt.values[idx].FpControlStatus.LastFpRip;
+    idx += 1;
+
+    /* XMM control status register */
+    assert(whpx_register_names[idx] == WHvX64RegisterXmmControlStatus);
+    env->mxcsr = vcxt.values[idx].XmmControlStatus.XmmStatusControl;
+    idx += 1;
+
+    /* MSRs */
+    assert(whpx_register_names[idx] == WHvX64RegisterTsc);
+    env->tsc = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterEfer);
+    env->efer = vcxt.values[idx++].Reg64;
+#ifdef TARGET_X86_64
+    assert(whpx_register_names[idx] == WHvX64RegisterKernelGsBase);
+    env->kernelgsbase = vcxt.values[idx++].Reg64;
+#endif
+
+    assert(whpx_register_names[idx] == WHvX64RegisterApicBase);
+    apic_base = vcxt.values[idx++].Reg64;
+    if (apic_base != vcpu->apic_base) {
+        vcpu->apic_base = apic_base;
+        cpu_set_apic_base(x86_cpu->apic_state, vcpu->apic_base);
+    }
+
+    /* WHvX64RegisterPat - Skipped */
+
+    assert(whpx_register_names[idx] == WHvX64RegisterSysenterCs);
+    env->sysenter_cs = vcxt.values[idx++].Reg64;;
+    assert(whpx_register_names[idx] == WHvX64RegisterSysenterEip);
+    env->sysenter_eip = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterSysenterEsp);
+    env->sysenter_esp = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterStar);
+    env->star = vcxt.values[idx++].Reg64;
+#ifdef TARGET_X86_64
+    assert(whpx_register_names[idx] == WHvX64RegisterLstar);
+    env->lstar = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterCstar);
+    env->cstar = vcxt.values[idx++].Reg64;
+    assert(whpx_register_names[idx] == WHvX64RegisterSfmask);
+    env->fmask = vcxt.values[idx++].Reg64;
+#endif
+
+    /* Interrupt / Event Registers - Skipped */
+
+    assert(idx == RTL_NUMBER_OF(whpx_register_names));
+
+    return;
+}
+
+static HRESULT CALLBACK whpx_emu_ioport_callback(
+    void *ctx,
+    WHV_EMULATOR_IO_ACCESS_INFO *IoAccess)
+{
+    MemTxAttrs attrs = { 0 };
+    address_space_rw(&address_space_io, IoAccess->Port, attrs,
+                     (uint8_t *)&IoAccess->Data, IoAccess->AccessSize,
+                     IoAccess->Direction);
+    return S_OK;
+}
+
+static HRESULT CALLBACK whpx_emu_memio_callback(
+    void *ctx,
+    WHV_EMULATOR_MEMORY_ACCESS_INFO *ma)
+{
+    cpu_physical_memory_rw(ma->GpaAddress, ma->Data, ma->AccessSize,
+                           ma->Direction);
+    return S_OK;
+}
+
+static HRESULT CALLBACK whpx_emu_getreg_callback(
+    void *ctx,
+    const WHV_REGISTER_NAME *RegisterNames,
+    UINT32 RegisterCount,
+    WHV_REGISTER_VALUE *RegisterValues)
+{
+    HRESULT hr;
+    struct whpx_state *whpx = &whpx_global;
+    CPUState *cpu = (CPUState *)ctx;
+
+    hr = WHvGetVirtualProcessorRegisters(whpx->partition, cpu->cpu_index,
+                                         RegisterNames, RegisterCount,
+                                         RegisterValues);
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to get virtual processor registers,"
+                     " hr=%08lx", hr);
+        __debugbreak();
+    }
+
+    return hr;
+}
+
+static HRESULT CALLBACK whpx_emu_setreg_callback(
+    void *ctx,
+    const WHV_REGISTER_NAME *RegisterNames,
+    UINT32 RegisterCount,
+    const WHV_REGISTER_VALUE *RegisterValues)
+{
+    HRESULT hr;
+    struct whpx_state *whpx = &whpx_global;
+    CPUState *cpu = (CPUState *)ctx;
+
+    hr = WHvSetVirtualProcessorRegisters(whpx->partition, cpu->cpu_index,
+                                         RegisterNames, RegisterCount,
+                                         RegisterValues);
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to set virtual processor registers,"
+                     " hr=%08lx", hr);
+        __debugbreak();
+    }
+
+    /*
+     * The emulator just successfully wrote the register state. We clear the
+     * dirty state so we avoid the double write on resume of the VP.
+     */
+    cpu->vcpu_dirty = false;
+
+    return hr;
+}
+
+static HRESULT CALLBACK whpx_emu_translate_callback(
+    void *ctx,
+    WHV_GUEST_VIRTUAL_ADDRESS Gva,
+    WHV_TRANSLATE_GVA_FLAGS TranslateFlags,
+    WHV_TRANSLATE_GVA_RESULT_CODE *TranslationResult,
+    WHV_GUEST_PHYSICAL_ADDRESS *Gpa)
+{
+    HRESULT hr;
+    struct whpx_state *whpx = &whpx_global;
+    CPUState *cpu = (CPUState *)ctx;
+    WHV_TRANSLATE_GVA_RESULT res;
+
+    hr = WHvTranslateGva(whpx->partition, cpu->cpu_index,
+                         Gva, TranslateFlags, &res, Gpa);
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to translate GVA, hr=%08lx", hr);
+        __debugbreak();
+    } else {
+        *TranslationResult = res.ResultCode;
+    }
+
+    return hr;
+}
+
+static const WHV_EMULATOR_CALLBACKS whpx_emu_callbacks = {
+    .WHvEmulatorIoPortCallback = whpx_emu_ioport_callback,
+    .WHvEmulatorMemoryCallback = whpx_emu_memio_callback,
+    .WHvEmulatorGetVirtualProcessorRegisters = whpx_emu_getreg_callback,
+    .WHvEmulatorSetVirtualProcessorRegisters = whpx_emu_setreg_callback,
+    .WHvEmulatorTranslateGvaPage = whpx_emu_translate_callback,
+};
+
+static int whpx_handle_mmio(CPUState *cpu, WHV_MEMORY_ACCESS_CONTEXT *ctx)
+{
+    HRESULT hr;
+    struct whpx_vcpu *vcpu = get_whpx_vcpu(cpu);
+    WHV_EMULATOR_STATUS emu_status;
+
+    hr = WHvEmulatorTryMmioEmulation(vcpu->emulator, cpu, ctx, &emu_status);
+    if (FAILED(hr)) {
+        __debugbreak();
+        error_report("WHPX: Failed to parse MMIO access, hr=%08lx", hr);
+        return -1;
+    }
+
+    if (!emu_status.EmulationSuccessful) {
+        __debugbreak();
+        error_report("WHPX: Failed to emulate MMIO access");
+        return -1;
+    }
+
+    return 0;
+}
+
+static int whpx_handle_portio(CPUState *cpu,
+                              WHV_X64_IO_PORT_ACCESS_CONTEXT *ctx)
+{
+    HRESULT hr;
+    struct whpx_vcpu *vcpu = get_whpx_vcpu(cpu);
+    WHV_EMULATOR_STATUS emu_status;
+
+    hr = WHvEmulatorTryIoEmulation(vcpu->emulator, cpu, ctx, &emu_status);
+    if (FAILED(hr)) {
+        __debugbreak();
+        error_report("WHPX: Failed to parse PortIO access, hr=%08lx", hr);
+        return -1;
+    }
+
+    if (!emu_status.EmulationSuccessful) {
+        __debugbreak();
+        error_report("WHPX: Failed to emulate PortMMIO access");
+        return -1;
+    }
+
+    return 0;
+}
+
+static int whpx_handle_halt(CPUState *cpu)
+{
+    struct CPUX86State *env = (CPUArchState *)(cpu->env_ptr);
+    int ret = 0;
+
+    qemu_mutex_lock_iothread();
+    if (!((cpu->interrupt_request & CPU_INTERRUPT_HARD) &&
+          (env->eflags & IF_MASK)) &&
+        !(cpu->interrupt_request & CPU_INTERRUPT_NMI)) {
+        cpu->exception_index = EXCP_HLT;
+        cpu->halted = true;
+        ret = 1;
+    }
+    qemu_mutex_unlock_iothread();
+
+    return ret;
+}
+
+static void whpx_vcpu_pre_run(CPUState *cpu)
+{
+    HRESULT hr;
+    struct whpx_state *whpx = &whpx_global;
+    struct whpx_vcpu *vcpu = get_whpx_vcpu(cpu);
+    struct CPUX86State *env = (CPUArchState *)(cpu->env_ptr);
+    X86CPU *x86_cpu = X86_CPU(cpu);
+    int irq;
+    WHV_X64_PENDING_INTERRUPTION_REGISTER new_int = {0};
+    UINT32 reg_count = 0;
+    WHV_REGISTER_VALUE reg_values[3] = {0};
+    WHV_REGISTER_NAME reg_names[3];
+
+    qemu_mutex_lock_iothread();
+
+    /* Inject NMI */
+    if (!vcpu->interrupt_in_flight.InterruptionPending &&
+        cpu->interrupt_request & (CPU_INTERRUPT_NMI | CPU_INTERRUPT_SMI)) {
+        if (cpu->interrupt_request & CPU_INTERRUPT_NMI) {
+            cpu->interrupt_request &= ~CPU_INTERRUPT_NMI;
+            vcpu->interruptable = false;
+            new_int.InterruptionType = WHvX64PendingNmi;
+            new_int.InterruptionPending = 1;
+            new_int.InterruptionVector = 2;
+        }
+        if (cpu->interrupt_request & CPU_INTERRUPT_SMI) {
+            qemu_mutex_lock_iothread();
+            cpu->interrupt_request &= ~CPU_INTERRUPT_SMI;
+            __debugbreak();
+            qemu_mutex_unlock_iothread();
+        }
+    }
+
+    /*
+     * Force the VCPU out of its inner loop to process any INIT requests or
+     * commit pending TPR access.
+     */
+    if (cpu->interrupt_request & (CPU_INTERRUPT_INIT | CPU_INTERRUPT_TPR)) {
+        if ((cpu->interrupt_request & CPU_INTERRUPT_INIT) &&
+            !(env->hflags & HF_SMM_MASK)) {
+            cpu->exit_request = 1;
+        }
+        if (cpu->interrupt_request & CPU_INTERRUPT_TPR) {
+            cpu->exit_request = 1;
+        }
+    }
+
+    /* Get pending hard interruption or replay one that was overwritten */
+    if (!vcpu->interrupt_in_flight.InterruptionPending &&
+        vcpu->interruptable && (env->eflags & IF_MASK)) {
+        assert(!new_int.InterruptionPending);
+        if (cpu->interrupt_request & CPU_INTERRUPT_HARD) {
+            cpu->interrupt_request &= ~CPU_INTERRUPT_HARD;
+            irq = cpu_get_pic_interrupt(env);
+            if (irq >= 0) {
+                new_int.InterruptionType = WHvX64PendingInterrupt;
+                new_int.InterruptionPending = 1;
+                new_int.InterruptionVector = irq;
+            }
+        }
+    }
+
+    /* Setup interrupt state if new one was prepared */
+    if (new_int.InterruptionPending) {
+        reg_values[reg_count].PendingInterruption = new_int;
+        reg_names[reg_count] = WHvRegisterPendingInterruption;
+        reg_count += 1;
+    }
+
+    /* Sync the TPR to the CR8 if was modified during the intercept */
+    reg_values[reg_count].Reg64 = cpu_get_apic_tpr(x86_cpu->apic_state);
+    if (reg_values[reg_count].Reg64 != vcpu->tpr) {
+        vcpu->tpr = reg_values[reg_count].Reg64;
+        cpu->exit_request = 1;
+        reg_names[reg_count] = WHvX64RegisterCr8;
+        reg_count += 1;
+    }
+
+    /* Update the state of the interrupt delivery notification */
+    if (cpu->interrupt_request & CPU_INTERRUPT_HARD) {
+        reg_values[reg_count].DeliverabilityNotifications.InterruptNotification
+            = 1;
+        if (vcpu->window_registered != 1) {
+            vcpu->window_registered = 1;
+        }
+        reg_names[reg_count] = WHvX64RegisterDeliverabilityNotifications;
+        reg_count += 1;
+    }
+
+    qemu_mutex_unlock_iothread();
+
+    if (reg_count) {
+        hr = WHvSetVirtualProcessorRegisters(whpx->partition, cpu->cpu_index,
+                                             reg_names, reg_count, reg_values);
+        if (FAILED(hr)) {
+            error_report("WHPX: Failed to set interrupt state registers,"
+                         " hr=%08lx", hr);
+            __debugbreak();
+        }
+    }
+
+    return;
+}
+
+static void whpx_vcpu_post_run(CPUState *cpu)
+{
+    HRESULT hr;
+    struct whpx_state *whpx = &whpx_global;
+    struct whpx_vcpu *vcpu = get_whpx_vcpu(cpu);
+    struct CPUX86State *env = (CPUArchState *)(cpu->env_ptr);
+    X86CPU *x86_cpu = X86_CPU(cpu);
+    WHV_REGISTER_VALUE reg_values[4];
+    const WHV_REGISTER_NAME reg_names[4] = {
+        WHvX64RegisterRflags,
+        WHvX64RegisterCr8,
+        WHvRegisterPendingInterruption,
+        WHvRegisterInterruptState,
+    };
+
+    hr = WHvGetVirtualProcessorRegisters(whpx->partition, cpu->cpu_index,
+                                         reg_names, 4, reg_values);
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to get interrupt state regusters,"
+                     " hr=%08lx", hr);
+        __debugbreak();
+        vcpu->interruptable = false;
+        return;
+    }
+
+    assert(reg_names[0] == WHvX64RegisterRflags);
+    env->eflags = reg_values[0].Reg64;
+
+    assert(reg_names[1] == WHvX64RegisterCr8);
+    if (vcpu->tpr != reg_values[1].Reg64) {
+        vcpu->tpr = reg_values[1].Reg64;
+        qemu_mutex_lock_iothread();
+        cpu_set_apic_tpr(x86_cpu->apic_state, vcpu->tpr);
+        qemu_mutex_unlock_iothread();
+    }
+
+    assert(reg_names[2] == WHvRegisterPendingInterruption);
+    vcpu->interrupt_in_flight = reg_values[2].PendingInterruption;
+
+    assert(reg_names[3] == WHvRegisterInterruptState);
+    vcpu->interruptable = !reg_values[3].InterruptState.InterruptShadow;
+
+    return;
+}
+
+static void whpx_vcpu_process_async_events(CPUState *cpu)
+{
+    struct CPUX86State *env = (CPUArchState *)(cpu->env_ptr);
+    X86CPU *x86_cpu = X86_CPU(cpu);
+    struct whpx_vcpu *vcpu = get_whpx_vcpu(cpu);
+
+    if ((cpu->interrupt_request & CPU_INTERRUPT_INIT) &&
+        !(env->hflags & HF_SMM_MASK)) {
+
+        do_cpu_init(x86_cpu);
+        cpu->vcpu_dirty = true;
+        vcpu->interruptable = true;
+    }
+
+    if (cpu->interrupt_request & CPU_INTERRUPT_POLL) {
+        cpu->interrupt_request &= ~CPU_INTERRUPT_POLL;
+        apic_poll_irq(x86_cpu->apic_state);
+    }
+
+    if (((cpu->interrupt_request & CPU_INTERRUPT_HARD) &&
+         (env->eflags & IF_MASK)) ||
+        (cpu->interrupt_request & CPU_INTERRUPT_NMI)) {
+        cpu->halted = false;
+    }
+
+    if (cpu->interrupt_request & CPU_INTERRUPT_SIPI) {
+        if (!cpu->vcpu_dirty) {
+            whpx_get_registers(cpu);
+        }
+        do_cpu_sipi(x86_cpu);
+    }
+
+    if (cpu->interrupt_request & CPU_INTERRUPT_TPR) {
+        cpu->interrupt_request &= ~CPU_INTERRUPT_TPR;
+        if (!cpu->vcpu_dirty) {
+            whpx_get_registers(cpu);
+        }
+        apic_handle_tpr_access_report(x86_cpu->apic_state, env->eip,
+                                      env->tpr_access_type);
+    }
+
+    return;
+}
+
+static int whpx_vcpu_run(CPUState *cpu)
+{
+    HRESULT hr;
+    struct whpx_state *whpx = &whpx_global;
+    struct whpx_vcpu *vcpu = get_whpx_vcpu(cpu);
+    int ret;
+
+    whpx_vcpu_process_async_events(cpu);
+    if (cpu->halted) {
+        cpu->exception_index = EXCP_HLT;
+        atomic_set(&cpu->exit_request, false);
+        return 0;
+    }
+
+    qemu_mutex_unlock_iothread();
+    cpu_exec_start(cpu);
+
+    do {
+        if (cpu->vcpu_dirty) {
+            whpx_set_registers(cpu);
+            cpu->vcpu_dirty = false;
+        }
+
+        whpx_vcpu_pre_run(cpu);
+
+        if (atomic_read(&cpu->exit_request)) {
+            whpx_vcpu_kick(cpu);
+        }
+
+        for (;;) {
+            hr = WHvRunVirtualProcessor(whpx->partition, cpu->cpu_index,
+                                        &vcpu->exit_ctx, whpx->exit_ctx_size);
+
+            if (SUCCEEDED(hr) && (vcpu->exit_ctx.ExitReason ==
+                                  WHvRunVpExitReasonAlerted)) {
+                WHvCancelRunVirtualProcessor(whpx->partition, cpu->cpu_index,
+                                             0);
+            } else {
+                break;
+            }
+        }
+
+        if (FAILED(hr)) {
+            error_report("WHPX: Failed to exec a virtual processor,"
+                         " hr=%08lx", hr);
+            ret = -1;
+            break;
+        }
+
+        whpx_vcpu_post_run(cpu);
+
+        switch (vcpu->exit_ctx.ExitReason) {
+        case WHvRunVpExitReasonMemoryAccess:
+            ret = whpx_handle_mmio(cpu, &vcpu->exit_ctx.MemoryAccess);
+            break;
+
+        case WHvRunVpExitReasonX64IoPortAccess:
+            ret = whpx_handle_portio(cpu, &vcpu->exit_ctx.IoPortAccess);
+            break;
+
+        case WHvRunVpExitReasonX64InterruptWindow:
+            vcpu->window_registered = 0;
+            break;
+
+        case WHvRunVpExitReasonX64Halt:
+            ret = whpx_handle_halt(cpu);
+            break;
+
+        case WHvRunVpExitReasonCanceled:
+            cpu->exception_index = EXCP_INTERRUPT;
+            ret = 1;
+            break;
+
+        case WHvRunVpExitReasonNone:
+        case WHvRunVpExitReasonUnrecoverableException:
+        case WHvRunVpExitReasonInvalidVpRegisterValue:
+        case WHvRunVpExitReasonUnsupportedFeature:
+        case WHvRunVpExitReasonX64MsrAccess:
+        case WHvRunVpExitReasonX64Cpuid:
+        case WHvRunVpExitReasonException:
+        case WHvRunVpExitReasonAlerted:
+        default:
+            error_report("WHPX: Unexpected VP exit code %d",
+                         vcpu->exit_ctx.ExitReason);
+            whpx_get_registers(cpu);
+            qemu_mutex_lock_iothread();
+            qemu_system_guest_panicked(cpu_get_crash_info(cpu));
+            qemu_mutex_unlock_iothread();
+            break;
+        }
+
+    } while (!ret);
+
+    cpu_exec_end(cpu);
+    qemu_mutex_lock_iothread();
+    current_cpu = cpu;
+
+    atomic_set(&cpu->exit_request, false);
+
+    return ret < 0;
+}
+
+static void do_whpx_cpu_synchronize_state(CPUState *cpu, run_on_cpu_data arg)
+{
+    whpx_get_registers(cpu);
+    cpu->vcpu_dirty = true;
+}
+
+static void do_whpx_cpu_synchronize_post_reset(CPUState *cpu,
+                                               run_on_cpu_data arg)
+{
+    whpx_set_registers(cpu);
+    cpu->vcpu_dirty = false;
+}
+
+static void do_whpx_cpu_synchronize_post_init(CPUState *cpu,
+                                              run_on_cpu_data arg)
+{
+    whpx_set_registers(cpu);
+    cpu->vcpu_dirty = false;
+}
+
+static void do_whpx_cpu_synchronize_pre_loadvm(CPUState *cpu,
+                                               run_on_cpu_data arg)
+{
+    cpu->vcpu_dirty = true;
+}
+
+/*
+ * CPU support.
+ */
+
+void whpx_cpu_synchronize_state(CPUState *cpu)
+{
+    if (!cpu->vcpu_dirty) {
+        run_on_cpu(cpu, do_whpx_cpu_synchronize_state, RUN_ON_CPU_NULL);
+    }
+}
+
+void whpx_cpu_synchronize_post_reset(CPUState *cpu)
+{
+    run_on_cpu(cpu, do_whpx_cpu_synchronize_post_reset, RUN_ON_CPU_NULL);
+}
+
+void whpx_cpu_synchronize_post_init(CPUState *cpu)
+{
+    run_on_cpu(cpu, do_whpx_cpu_synchronize_post_init, RUN_ON_CPU_NULL);
+}
+
+void whpx_cpu_synchronize_pre_loadvm(CPUState *cpu)
+{
+    run_on_cpu(cpu, do_whpx_cpu_synchronize_pre_loadvm, RUN_ON_CPU_NULL);
+}
+
+/*
+ * Vcpu support.
+ */
+
+static Error *whpx_migration_blocker;
+
+int whpx_init_vcpu(CPUState *cpu)
+{
+    HRESULT hr;
+    struct whpx_state *whpx = &whpx_global;
+    struct whpx_vcpu *vcpu;
+    Error *local_error = NULL;
+
+    /* Add migration blockers for all unsupported features of the
+     * Windows Hypervisor Platform
+     */
+    if (whpx_migration_blocker == NULL) {
+        error_setg(&whpx_migration_blocker,
+               "State blocked due to non-migratable CPUID feature support,"
+               "dirty memory tracking support, and XSAVE/XRSTOR support");
+
+        (void)migrate_add_blocker(whpx_migration_blocker, &local_error);
+        if (local_error) {
+            error_report_err(local_error);
+            error_free(whpx_migration_blocker);
+            migrate_del_blocker(whpx_migration_blocker);
+            return -EINVAL;
+        }
+    }
+
+    vcpu = g_malloc0(FIELD_OFFSET(struct whpx_vcpu, exit_ctx) +
+                     whpx->exit_ctx_size);
+
+    if (!vcpu) {
+        error_report("WHPX: Failed to allocte VCPU context.");
+        return -ENOMEM;
+    }
+
+    hr = WHvEmulatorCreateEmulator(whpx_emu_callbacks, &vcpu->emulator);
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to setup instruction completion support,"
+                     " hr=%08lx", hr);
+        g_free(vcpu);
+        return -EINVAL;
+    }
+
+    hr = WHvCreateVirtualProcessor(whpx->partition, cpu->cpu_index, 0);
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to create a virtual processor,"
+                     " hr=%08lx", hr);
+        WHvEmulatorDestroyEmulator(vcpu->emulator);
+        g_free(vcpu);
+        return -EINVAL;
+    }
+
+    vcpu->interruptable = true;
+
+    cpu->vcpu_dirty = true;
+    cpu->hax_vcpu = (struct hax_vcpu_state *)vcpu;
+
+    return 0;
+}
+
+int whpx_vcpu_exec(CPUState *cpu)
+{
+    int ret;
+    int fatal;
+
+    for (;;) {
+        if (cpu->exception_index >= EXCP_INTERRUPT) {
+            ret = cpu->exception_index;
+            cpu->exception_index = -1;
+            break;
+        }
+
+        fatal = whpx_vcpu_run(cpu);
+
+        if (fatal) {
+            error_report("WHPX: Failed to exec a virtual processor");
+            abort();
+        }
+    }
+
+    return ret;
+}
+
+void whpx_destroy_vcpu(CPUState *cpu)
+{
+    struct whpx_state *whpx = &whpx_global;
+    struct whpx_vcpu *vcpu = get_whpx_vcpu(cpu);
+
+    WHvDeleteVirtualProcessor(whpx->partition, cpu->cpu_index);
+    WHvEmulatorDestroyEmulator(vcpu->emulator);
+    g_free(cpu->hax_vcpu);
+    return;
+}
+
+void whpx_vcpu_kick(CPUState *cpu)
+{
+    struct whpx_state *whpx = &whpx_global;
+    WHvCancelRunVirtualProcessor(whpx->partition, cpu->cpu_index, 0);
+}
+
+/*
+ * Memory support.
+ */
+
+static void whpx_update_mapping(hwaddr start_pa, ram_addr_t size,
+                                void *host_va, int add, int rom,
+                                const char *name)
+{
+    struct whpx_state *whpx = &whpx_global;
+    HRESULT hr;
+
+    /*
+    if (add) {
+        printf("WHPX: ADD PA:%p Size:%p, Host:%p, %s, '%s'\n",
+               (void*)start_pa, (void*)size, host_va,
+               (rom ? "ROM" : "RAM"), name);
+    } else {
+        printf("WHPX: DEL PA:%p Size:%p, Host:%p,      '%s'\n",
+               (void*)start_pa, (void*)size, host_va, name);
+    }
+    */
+
+    if (add) {
+        hr = WHvMapGpaRange(whpx->partition,
+                            host_va,
+                            start_pa,
+                            size,
+                            (WHvMapGpaRangeFlagRead |
+                             WHvMapGpaRangeFlagExecute |
+                             (rom ? 0 : WHvMapGpaRangeFlagWrite)));
+    } else {
+        hr = WHvUnmapGpaRange(whpx->partition,
+                              start_pa,
+                              size);
+    }
+
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to %s GPA range '%s' PA:%p, Size:%p bytes,"
+                     " Host:%p, hr=%08lx",
+                     (add ? "MAP" : "UNMAP"), name,
+                     (void *)start_pa, (void *)size, host_va, hr);
+    }
+}
+
+static void whpx_process_section(MemoryRegionSection *section, int add)
+{
+    MemoryRegion *mr = section->mr;
+    hwaddr start_pa = section->offset_within_address_space;
+    ram_addr_t size = int128_get64(section->size);
+    unsigned int delta;
+    uint64_t host_va;
+
+    if (!memory_region_is_ram(mr)) {
+        return;
+    }
+
+    delta = qemu_real_host_page_size - (start_pa & ~qemu_real_host_page_mask);
+    delta &= ~qemu_real_host_page_mask;
+    if (delta > size) {
+        return;
+    }
+    start_pa += delta;
+    size -= delta;
+    size &= qemu_real_host_page_mask;
+    if (!size || (start_pa & ~qemu_real_host_page_mask)) {
+        return;
+    }
+
+    host_va = (uintptr_t)memory_region_get_ram_ptr(mr)
+            + section->offset_within_region + delta;
+
+    whpx_update_mapping(start_pa, size, (void *)host_va, add,
+                       memory_region_is_rom(mr), mr->name);
+}
+
+static void whpx_region_add(MemoryListener *listener,
+                           MemoryRegionSection *section)
+{
+    memory_region_ref(section->mr);
+    whpx_process_section(section, 1);
+}
+
+static void whpx_region_del(MemoryListener *listener,
+                           MemoryRegionSection *section)
+{
+    whpx_process_section(section, 0);
+    memory_region_unref(section->mr);
+}
+
+static void whpx_transaction_begin(MemoryListener *listener)
+{
+}
+
+static void whpx_transaction_commit(MemoryListener *listener)
+{
+}
+
+static void whpx_log_sync(MemoryListener *listener,
+                         MemoryRegionSection *section)
+{
+    MemoryRegion *mr = section->mr;
+
+    if (!memory_region_is_ram(mr)) {
+        return;
+    }
+
+    memory_region_set_dirty(mr, 0, int128_get64(section->size));
+}
+
+static MemoryListener whpx_memory_listener = {
+    .begin = whpx_transaction_begin,
+    .commit = whpx_transaction_commit,
+    .region_add = whpx_region_add,
+    .region_del = whpx_region_del,
+    .log_sync = whpx_log_sync,
+    .priority = 10,
+};
+
+static void whpx_memory_init(void)
+{
+    memory_listener_register(&whpx_memory_listener, &address_space_memory);
+}
+
+static void whpx_handle_interrupt(CPUState *cpu, int mask)
+{
+    cpu->interrupt_request |= mask;
+
+    if (!qemu_cpu_is_self(cpu)) {
+        qemu_cpu_kick(cpu);
+    }
+}
+
+/*
+ * Partition support
+ */
+
+static int whpx_accel_init(MachineState *ms)
+{
+    struct whpx_state *whpx;
+    int ret;
+    HRESULT hr;
+    WHV_CAPABILITY whpx_cap;
+    WHV_PARTITION_PROPERTY prop;
+
+    whpx = &whpx_global;
+
+    memset(whpx, 0, sizeof(struct whpx_state));
+    whpx->mem_quota = ms->ram_size;
+
+    hr = WHvGetCapability(WHvCapabilityCodeHypervisorPresent, &whpx_cap,
+                          sizeof(whpx_cap));
+    if (FAILED(hr) || !whpx_cap.HypervisorPresent) {
+        error_report("WHPX: No accelerator found, hr=%08lx", hr);
+        ret = -ENOSPC;
+        goto error;
+    }
+
+    hr = WHvCreatePartition(&whpx->partition);
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to create partition, hr=%08lx", hr);
+        ret = -EINVAL;
+        goto error;
+    }
+
+    memset(&prop, 0, sizeof(WHV_PARTITION_PROPERTY));
+    prop.PropertyCode = WHvPartitionPropertyCodeProcessorCount;
+    prop.ProcessorCount = smp_cpus;
+    hr = WHvSetPartitionProperty(whpx->partition,
+                                 &prop,
+                                 sizeof(WHV_PARTITION_PROPERTY));
+
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to set partition core count to %d,"
+                     " hr=%08lx", smp_cores, hr);
+        ret = -EINVAL;
+        goto error;
+    }
+
+    hr = WHvSetupPartition(whpx->partition);
+    if (FAILED(hr)) {
+        error_report("WHPX: Failed to setup partition, hr=%08lx", hr);
+        ret = -EINVAL;
+        goto error;
+    }
+
+    whpx->exit_ctx_size = WHvGetRunExitContextSize();
+    assert(whpx->exit_ctx_size);
+
+    whpx_memory_init();
+
+    cpu_interrupt_handler = whpx_handle_interrupt;
+
+    printf("Windows Hypervisor Platform accelerator is operational\n");
+    return 0;
+
+  error:
+
+    if (NULL != whpx->partition) {
+        WHvDeletePartition(whpx->partition);
+        whpx->partition = NULL;
+    }
+
+
+    return ret;
+}
+
+int whpx_enabled(void)
+{
+    return whpx_allowed;
+}
+
+static void whpx_accel_class_init(ObjectClass *oc, void *data)
+{
+    AccelClass *ac = ACCEL_CLASS(oc);
+    ac->name = "WHPX";
+    ac->init_machine = whpx_accel_init;
+    ac->allowed = &whpx_allowed;
+}
+
+static const TypeInfo whpx_accel_type = {
+    .name = ACCEL_CLASS_NAME("whpx"),
+    .parent = TYPE_ACCEL,
+    .class_init = whpx_accel_class_init,
+};
+
+static void whpx_type_init(void)
+{
+    type_register_static(&whpx_accel_type);
+}
+
+type_init(whpx_type_init);