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target/i386: WHPX: set CPUID_EXT_HYPERVISOR bit

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Implements the CPUID trap for CPUID 1 to include the
CPUID_EXT_HYPERVISOR flag in the ECX results. This was preventing some
older linux kernels from booting when trying to access MSR's that dont
make sense when virtualized.

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>
Message-Id: <20180326170658.606-1-juterry@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Justin Terry (VM) 2018-03-26 10:06:58 -07:00 committed by Paolo Bonzini
parent 648abbfbaa
commit 7becac84fb
1 changed files with 78 additions and 1 deletions
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79
target/i386/whpx-all.c
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@ -911,12 +911,62 @@ static int whpx_vcpu_run(CPUState *cpu)
ret = 1;
break;
case WHvRunVpExitReasonX64Cpuid: {
WHV_REGISTER_VALUE reg_values[5] = {0};
WHV_REGISTER_NAME reg_names[5];
UINT32 reg_count = 5;
UINT64 rip, rax, rcx, rdx, rbx;
rip = vcpu->exit_ctx.VpContext.Rip +
vcpu->exit_ctx.VpContext.InstructionLength;
switch (vcpu->exit_ctx.CpuidAccess.Rax) {
case 1:
rax = vcpu->exit_ctx.CpuidAccess.DefaultResultRax;
/* Advertise that we are running on a hypervisor */
rcx =
vcpu->exit_ctx.CpuidAccess.DefaultResultRcx |
CPUID_EXT_HYPERVISOR;
rdx = vcpu->exit_ctx.CpuidAccess.DefaultResultRdx;
rbx = vcpu->exit_ctx.CpuidAccess.DefaultResultRbx;
break;
default:
rax = vcpu->exit_ctx.CpuidAccess.DefaultResultRax;
rcx = vcpu->exit_ctx.CpuidAccess.DefaultResultRcx;
rdx = vcpu->exit_ctx.CpuidAccess.DefaultResultRdx;
rbx = vcpu->exit_ctx.CpuidAccess.DefaultResultRbx;
}
reg_names[0] = WHvX64RegisterRip;
reg_names[1] = WHvX64RegisterRax;
reg_names[2] = WHvX64RegisterRcx;
reg_names[3] = WHvX64RegisterRdx;
reg_names[4] = WHvX64RegisterRbx;
reg_values[0].Reg64 = rip;
reg_values[1].Reg64 = rax;
reg_values[2].Reg64 = rcx;
reg_values[3].Reg64 = rdx;
reg_values[4].Reg64 = rbx;
hr = WHvSetVirtualProcessorRegisters(whpx->partition,
cpu->cpu_index,
reg_names,
reg_count,
reg_values);
if (FAILED(hr)) {
error_report("WHPX: Failed to set CpuidAccess state registers,"
" hr=%08lx", hr);
}
ret = 0;
break;
}
case WHvRunVpExitReasonNone:
case WHvRunVpExitReasonUnrecoverableException:
case WHvRunVpExitReasonInvalidVpRegisterValue:
case WHvRunVpExitReasonUnsupportedFeature:
case WHvRunVpExitReasonX64MsrAccess:
case WHvRunVpExitReasonX64Cpuid:
case WHvRunVpExitReasonException:
default:
error_report("WHPX: Unexpected VP exit code %d",
@ -1272,6 +1322,33 @@ static int whpx_accel_init(MachineState *ms)
goto error;
}
memset(&prop, 0, sizeof(WHV_PARTITION_PROPERTY));
prop.ExtendedVmExits.X64CpuidExit = 1;
hr = WHvSetPartitionProperty(whpx->partition,
WHvPartitionPropertyCodeExtendedVmExits,
&prop,
sizeof(WHV_PARTITION_PROPERTY));
if (FAILED(hr)) {
error_report("WHPX: Failed to enable partition extended X64CpuidExit"
" hr=%08lx", hr);
ret = -EINVAL;
goto error;
}
UINT32 cpuidExitList[] = {1};
hr = 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;
}
hr = WHvSetupPartition(whpx->partition);
if (FAILED(hr)) {
error_report("WHPX: Failed to setup partition, hr=%08lx", hr);