haraldwolff/qemu-patch-raspberry4
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WHPX workaround bug in OSVW handling

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Adds a workaround to an incorrect value setting
CPUID Fn8000_0001_ECX[bit 9 OSVW] = 1. This can cause a guest linux kernel
to panic when an issue to rdmsr C001_0140h returns 0. Disabling this feature
correctly allows the guest to boot without accessing the osv workarounds.

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>
Message-Id: <20180605221500.21674-1-juterry@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Justin Terry (VM) 2018-06-05 22:15:27 +00:00 committed by Paolo Bonzini
parent e7d99825f0
commit e1753a7e1d
1 changed files with 12 additions and 1 deletions
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13
target/i386/whpx-all.c
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@ -961,6 +961,16 @@ static int whpx_vcpu_run(CPUState *cpu)
vcpu->exit_ctx.CpuidAccess.DefaultResultRcx |
CPUID_EXT_HYPERVISOR;
rdx = vcpu->exit_ctx.CpuidAccess.DefaultResultRdx;
rbx = vcpu->exit_ctx.CpuidAccess.DefaultResultRbx;
break;
case 0x80000001:
rax = vcpu->exit_ctx.CpuidAccess.DefaultResultRax;
/* Remove any support of OSVW */
rcx =
vcpu->exit_ctx.CpuidAccess.DefaultResultRcx &
~CPUID_EXT3_OSVW;
rdx = vcpu->exit_ctx.CpuidAccess.DefaultResultRdx;
rbx = vcpu->exit_ctx.CpuidAccess.DefaultResultRbx;
break;
@ -1382,12 +1392,13 @@ static int whpx_accel_init(MachineState *ms)
goto error;
}
UINT32 cpuidExitList[] = {1};
UINT32 cpuidExitList[] = {1, 0x80000001};
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);