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KVM: nVMX: Do not forward VMREAD/VMWRITE VMExits to L1 if required so by vmcs12 vmread/vmwrite bitmaps

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This is done as a preparation for VMCS shadowing emulation.

Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liran Alon 2018-06-23 02:35:10 +03:00 committed by Paolo Bonzini
parent 6d894f498f
commit a7cde481b6
1 changed files with 31 additions and 2 deletions
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33
arch/x86/kvm/vmx.c
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@ -9107,6 +9107,30 @@ static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu,
return false; return false;
} }
static bool nested_vmx_exit_handled_vmcs_access(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12, gpa_t bitmap)
{
u32 vmx_instruction_info;
unsigned long field;
u8 b;
if (!nested_cpu_has_shadow_vmcs(vmcs12))
return true;
/* Decode instruction info and find the field to access */
vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
/* Out-of-range fields always cause a VM exit from L2 to L1 */
if (field >> 15)
return true;
if (kvm_vcpu_read_guest(vcpu, bitmap + field/8, &b, 1))
return true;
return 1 & (b >> (field & 7));
}
/* /*
* Return 1 if we should exit from L2 to L1 to handle an exit, or 0 if we * Return 1 if we should exit from L2 to L1 to handle an exit, or 0 if we
* should handle it ourselves in L0 (and then continue L2). Only call this * should handle it ourselves in L0 (and then continue L2). Only call this
@ -9191,10 +9215,15 @@ static bool nested_vmx_exit_reflected(struct kvm_vcpu *vcpu, u32 exit_reason)
return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDSEED_EXITING); return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDSEED_EXITING);
case EXIT_REASON_RDTSC: case EXIT_REASON_RDTSCP: case EXIT_REASON_RDTSC: case EXIT_REASON_RDTSCP:
return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING); return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING);
case EXIT_REASON_VMREAD:
return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12,
vmcs12->vmread_bitmap);
case EXIT_REASON_VMWRITE:
return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12,
vmcs12->vmwrite_bitmap);
case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR: case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR:
case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD: case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD:
case EXIT_REASON_VMPTRST: case EXIT_REASON_VMREAD: case EXIT_REASON_VMPTRST: case EXIT_REASON_VMRESUME:
case EXIT_REASON_VMRESUME: case EXIT_REASON_VMWRITE:
case EXIT_REASON_VMOFF: case EXIT_REASON_VMON: case EXIT_REASON_VMOFF: case EXIT_REASON_VMON:
case EXIT_REASON_INVEPT: case EXIT_REASON_INVVPID: case EXIT_REASON_INVEPT: case EXIT_REASON_INVVPID:
/* /*