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WHPX: vmware cpuid leaf for tsc and apic frequency

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Newer versions of WHPX provide the capability to query the tsc
and apic frequency. Expose these through the vmware cpuid leaf.
This patch doesnt support setting the tsc frequency; that will
come as a separate fix.

Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Message-Id: <SN4PR2101MB08808DFDDC3F442BBEAADFF4C0710@SN4PR2101MB0880.namprd21.prod.outlook.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sunil Muthuswamy 2020-07-30 22:11:26 +00:00 committed by Paolo Bonzini
parent 8fe11232c8
commit 5c8e1e8328
2 changed files with 87 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
target/i386/whp-dispatch.h
View File

@ -2,10 +2,11 @@
#define WHP_DISPATCH_H
#include <windows.h>
#include <WinHvPlatform.h>
#include <WinHvEmulation.h>
#define WHV_E_UNKNOWN_CAPABILITY 0x80370300L
#define LIST_WINHVPLATFORM_FUNCTIONS(X) \
X(HRESULT, WHvGetCapability, (WHV_CAPABILITY_CODE CapabilityCode, VOID* CapabilityBuffer, UINT32 CapabilityBufferSizeInBytes, UINT32* WrittenSizeInBytes)) \
X(HRESULT, WHvCreatePartition, (WHV_PARTITION_HANDLE* Partition)) \

96
target/i386/whpx-all.c
View File

@ -27,6 +27,8 @@
#include <WinHvPlatform.h>
#include <WinHvEmulation.h>
#define HYPERV_APIC_BUS_FREQUENCY (200000000ULL)
struct whpx_state {
uint64_t mem_quota;
WHV_PARTITION_HANDLE partition;
@ -1061,6 +1063,18 @@ static int whpx_vcpu_run(CPUState *cpu)
cpu_x86_cpuid(env, cpuid_fn, 0, (UINT32 *)&rax, (UINT32 *)&rbx,
(UINT32 *)&rcx, (UINT32 *)&rdx);
switch (cpuid_fn) {
case 0x40000000:
/* Expose the vmware cpu frequency cpuid leaf */
rax = 0x40000010;
rbx = rcx = rdx = 0;
break;
case 0x40000010:
rax = env->tsc_khz;
rbx = env->apic_bus_freq / 1000; /* Hz to KHz */
rcx = rdx = 0;
break;
case 0x80000001:
/* Remove any support of OSVW */
rcx &= ~CPUID_EXT3_OSVW;
@ -1191,8 +1205,12 @@ int whpx_init_vcpu(CPUState *cpu)
{
HRESULT hr;
struct whpx_state *whpx = &whpx_global;
struct whpx_vcpu *vcpu;
struct whpx_vcpu *vcpu = NULL;
Error *local_error = NULL;
struct CPUX86State *env = (CPUArchState *)(cpu->env_ptr);
X86CPU *x86_cpu = X86_CPU(cpu);
UINT64 freq = 0;
int ret;
/* Add migration blockers for all unsupported features of the
* Windows Hypervisor Platform
@ -1207,7 +1225,8 @@ int whpx_init_vcpu(CPUState *cpu)
error_report_err(local_error);
migrate_del_blocker(whpx_migration_blocker);
error_free(whpx_migration_blocker);
return -EINVAL;
ret = -EINVAL;
goto error;
}
}
@ -1215,7 +1234,8 @@ int whpx_init_vcpu(CPUState *cpu)
if (!vcpu) {
error_report("WHPX: Failed to allocte VCPU context.");
return -ENOMEM;
ret = -ENOMEM;
goto error;
}
hr = whp_dispatch.WHvEmulatorCreateEmulator(
@ -1224,8 +1244,8 @@ int whpx_init_vcpu(CPUState *cpu)
if (FAILED(hr)) {
error_report("WHPX: Failed to setup instruction completion support,"
" hr=%08lx", hr);
g_free(vcpu);
return -EINVAL;
ret = -EINVAL;
goto error;
}
hr = whp_dispatch.WHvCreateVirtualProcessor(
@ -1234,17 +1254,72 @@ int whpx_init_vcpu(CPUState *cpu)
error_report("WHPX: Failed to create a virtual processor,"
" hr=%08lx", hr);
whp_dispatch.WHvEmulatorDestroyEmulator(vcpu->emulator);
g_free(vcpu);
return -EINVAL;
ret = -EINVAL;
goto error;
}
/*
* vcpu's TSC frequency is either specified by user, or use the value
* provided by Hyper-V if the former is not present. In the latter case, we
* query it from Hyper-V and record in env->tsc_khz, so that vcpu's TSC
* frequency can be migrated later via this field.
*/
if (!env->tsc_khz) {
hr = whp_dispatch.WHvGetCapability(
WHvCapabilityCodeProcessorClockFrequency, &freq, sizeof(freq),
NULL);
if (hr != WHV_E_UNKNOWN_CAPABILITY) {
if (FAILED(hr)) {
printf("WHPX: Failed to query tsc frequency, hr=0x%08lx\n", hr);
} else {
env->tsc_khz = freq / 1000; /* Hz to KHz */
}
}
}
env->apic_bus_freq = HYPERV_APIC_BUS_FREQUENCY;
hr = whp_dispatch.WHvGetCapability(
WHvCapabilityCodeInterruptClockFrequency, &freq, sizeof(freq), NULL);
if (hr != WHV_E_UNKNOWN_CAPABILITY) {
if (FAILED(hr)) {
printf("WHPX: Failed to query apic bus frequency hr=0x%08lx\n", hr);
} else {
env->apic_bus_freq = freq;
}
}
/*
* If the vmware cpuid frequency leaf option is set, and we have a valid
* tsc value, trap the corresponding cpuid's.
*/
if (x86_cpu->vmware_cpuid_freq && env->tsc_khz) {
UINT32 cpuidExitList[] = {1, 0x80000001, 0x40000000, 0x40000010};
hr = whp_dispatch.WHvSetPartitionProperty(
whpx->partition,
WHvPartitionPropertyCodeCpuidExitList,
cpuidExitList,
RTL_NUMBER_OF(cpuidExitList) * sizeof(UINT32));
if (FAILED(hr)) {
error_report("WHPX: Failed to set partition CpuidExitList hr=%08lx",
hr);
ret = -EINVAL;
goto error;
}
}
vcpu->interruptable = true;
cpu->vcpu_dirty = true;
cpu->hax_vcpu = (struct hax_vcpu_state *)vcpu;
qemu_add_vm_change_state_handler(whpx_cpu_update_state, cpu->env_ptr);
return 0;
error:
g_free(vcpu);
return ret;
}
int whpx_vcpu_exec(CPUState *cpu)
@ -1493,6 +1568,7 @@ static int whpx_accel_init(MachineState *ms)
WHV_CAPABILITY whpx_cap;
UINT32 whpx_cap_size;
WHV_PARTITION_PROPERTY prop;
UINT32 cpuidExitList[] = {1, 0x80000001};
whpx = &whpx_global;
@ -1551,7 +1627,6 @@ static int whpx_accel_init(MachineState *ms)
goto error;
}
UINT32 cpuidExitList[] = {1, 0x80000001};
hr = whp_dispatch.WHvSetPartitionProperty(
whpx->partition,
WHvPartitionPropertyCodeCpuidExitList,
@ -1579,14 +1654,13 @@ static int whpx_accel_init(MachineState *ms)
printf("Windows Hypervisor Platform accelerator is operational\n");
return 0;
error:
error:
if (NULL != whpx->partition) {
whp_dispatch.WHvDeletePartition(whpx->partition);
whpx->partition = NULL;
}
return ret;
}