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20:XX2BnNKWyuCQwziksm22KLvAU4CIniAMjGQzbVoNE2DaXzwqSpdRClhMvtMmf9UA8HlBX4r0PaRiojYI/5EOYgHVPAkXv7fehDWwGgVXj4fVzU7wlnVD4AtQ576JHTk6KP/jNwZdiXUL8pW/na/65QdnBuSHjOW8zlzd6IyjcW8= X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Mar 2018 17:07:08.6046 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1a482007-88a9-4893-a2ba-08d5933c0251 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR21MB0170 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 104.47.38.99 Subject: [Qemu-devel] [PATCH] WHPX fixes an issue with CPUID 1 not returning CPUID_EXT_HYPERVISOR X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: "Justin Terry \(VM\) via Qemu-devel" Reply-To: "Justin Terry \(VM\)" Cc: pbonzini@redhat.com, "Justin Terry \(VM\)" , ehabkost@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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) --- target/i386/whpx-all.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++= +++- 1 file changed, 78 insertions(+), 1 deletion(-) diff --git a/target/i386/whpx-all.c b/target/i386/whpx-all.c index bf33d320bf..58435178a4 100644 --- a/target/i386/whpx-all.c +++ b/target/i386/whpx-all.c @@ -911,12 +911,62 @@ static int whpx_vcpu_run(CPUState *cpu) ret =3D 1; break; =20 + case WHvRunVpExitReasonX64Cpuid: { + WHV_REGISTER_VALUE reg_values[5] =3D {0}; + WHV_REGISTER_NAME reg_names[5]; + UINT32 reg_count =3D 5; + UINT64 rip, rax, rcx, rdx, rbx; + + rip =3D vcpu->exit_ctx.VpContext.Rip + + vcpu->exit_ctx.VpContext.InstructionLength; + switch (vcpu->exit_ctx.CpuidAccess.Rax) { + case 1: + rax =3D vcpu->exit_ctx.CpuidAccess.DefaultResultRax; + /* Advertise that we are running on a hypervisor */ + rcx =3D + vcpu->exit_ctx.CpuidAccess.DefaultResultRcx | + CPUID_EXT_HYPERVISOR; + + rdx =3D vcpu->exit_ctx.CpuidAccess.DefaultResultRdx; + rbx =3D vcpu->exit_ctx.CpuidAccess.DefaultResultRbx; + break; + default: + rax =3D vcpu->exit_ctx.CpuidAccess.DefaultResultRax; + rcx =3D vcpu->exit_ctx.CpuidAccess.DefaultResultRcx; + rdx =3D vcpu->exit_ctx.CpuidAccess.DefaultResultRdx; + rbx =3D vcpu->exit_ctx.CpuidAccess.DefaultResultRbx; + } + + reg_names[0] =3D WHvX64RegisterRip; + reg_names[1] =3D WHvX64RegisterRax; + reg_names[2] =3D WHvX64RegisterRcx; + reg_names[3] =3D WHvX64RegisterRdx; + reg_names[4] =3D WHvX64RegisterRbx; + + reg_values[0].Reg64 =3D rip; + reg_values[1].Reg64 =3D rax; + reg_values[2].Reg64 =3D rcx; + reg_values[3].Reg64 =3D rdx; + reg_values[4].Reg64 =3D rbx; + + hr =3D WHvSetVirtualProcessorRegisters(whpx->partition, + cpu->cpu_index, + reg_names, + reg_count, + reg_values); + + if (FAILED(hr)) { + error_report("WHPX: Failed to set CpuidAccess state regist= ers," + " hr=3D%08lx", hr); + } + ret =3D 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; } =20 + memset(&prop, 0, sizeof(WHV_PARTITION_PROPERTY)); + prop.ExtendedVmExits.X64CpuidExit =3D 1; + hr =3D WHvSetPartitionProperty(whpx->partition, + WHvPartitionPropertyCodeExtendedVmExits, + &prop, + sizeof(WHV_PARTITION_PROPERTY)); + + if (FAILED(hr)) { + error_report("WHPX: Failed to enable partition extended X64CpuidEx= it" + " hr=3D%08lx", hr); + ret =3D -EINVAL; + goto error; + } + + UINT32 cpuidExitList[] =3D {1}; + hr =3D WHvSetPartitionProperty(whpx->partition, + WHvPartitionPropertyCodeCpuidExitList, + cpuidExitList, + RTL_NUMBER_OF(cpuidExitList) * sizeof(UIN= T32)); + + if (FAILED(hr)) { + error_report("WHPX: Failed to set partition CpuidExitList hr=3D%08= lx", + hr); + ret =3D -EINVAL; + goto error; + } + hr =3D WHvSetupPartition(whpx->partition); if (FAILED(hr)) { error_report("WHPX: Failed to setup partition, hr=3D%08lx", hr); --=20 2.11.0