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Subject[PATCH 2/2] KVM: nVMX: Advertise VMFUNC to L1 hypervisor
Date
Advertise VMFUNC and EPTP switching function to the L1
hypervisor. Change nested_vmx_exit_handled() to return false
for VMFUNC so L0 can handle it.

Signed-off-by: Bandan Das <bsd@redhat.com>
---
arch/x86/include/asm/vmx.h | 4 ++++
arch/x86/kvm/vmx.c | 18 ++++++++++++++++++
2 files changed, 22 insertions(+)

diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index e06783e..5f63a2e 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -192,6 +192,8 @@ enum vmcs_field {
APIC_ACCESS_ADDR_HIGH = 0x00002015,
POSTED_INTR_DESC_ADDR = 0x00002016,
POSTED_INTR_DESC_ADDR_HIGH = 0x00002017,
+ VM_FUNCTION_CONTROL = 0x00002018,
+ VM_FUNCTION_CONTROL_HIGH = 0x00002019,
EPT_POINTER = 0x0000201a,
EPT_POINTER_HIGH = 0x0000201b,
EOI_EXIT_BITMAP0 = 0x0000201c,
@@ -202,6 +204,8 @@ enum vmcs_field {
EOI_EXIT_BITMAP2_HIGH = 0x00002021,
EOI_EXIT_BITMAP3 = 0x00002022,
EOI_EXIT_BITMAP3_HIGH = 0x00002023,
+ EPTP_LIST_ADDRESS = 0x00002024,
+ EPTP_LIST_ADDRESS_HIGH = 0x00002025,
VMREAD_BITMAP = 0x00002026,
VMWRITE_BITMAP = 0x00002028,
XSS_EXIT_BITMAP = 0x0000202C,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 75049c0..bf06bef 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -767,11 +767,13 @@ static const unsigned short vmcs_field_to_offset_table[] = {
FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr),
FIELD64(APIC_ACCESS_ADDR, apic_access_addr),
FIELD64(POSTED_INTR_DESC_ADDR, posted_intr_desc_addr),
+ FIELD64(VM_FUNCTION_CONTROL, vm_function_control),
FIELD64(EPT_POINTER, ept_pointer),
FIELD64(EOI_EXIT_BITMAP0, eoi_exit_bitmap0),
FIELD64(EOI_EXIT_BITMAP1, eoi_exit_bitmap1),
FIELD64(EOI_EXIT_BITMAP2, eoi_exit_bitmap2),
FIELD64(EOI_EXIT_BITMAP3, eoi_exit_bitmap3),
+ FIELD64(EPTP_LIST_ADDRESS, eptp_list_address),
FIELD64(XSS_EXIT_BITMAP, xss_exit_bitmap),
FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address),
FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer),
@@ -2806,6 +2808,13 @@ static void nested_vmx_setup_ctls_msrs(struct vcpu_vmx *vmx)
} else
vmx->nested.nested_vmx_ept_caps = 0;

+ if (cpu_has_vmx_vmfunc()) {
+ vmx->nested.nested_vmx_secondary_ctls_high |=
+ SECONDARY_EXEC_ENABLE_VMFUNC;
+ vmx->nested.nested_vmx_vmfunc_controls =
+ vmx_vmfunc_controls() & 1;
+ }
+
/*
* Old versions of KVM use the single-context version without
* checking for support, so declare that it is supported even
@@ -8215,6 +8224,8 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
case EXIT_REASON_PML_FULL:
/* We emulate PML support to L1. */
return false;
+ case EXIT_REASON_VMFUNC:
+ return false;
default:
return true;
}
@@ -10309,6 +10320,13 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
vmx_flush_tlb_ept_only(vcpu);
}

+ if (nested_cpu_has_eptp_switching(vmcs12)) {
+ vmcs_write64(VM_FUNCTION_CONTROL,
+ vmcs12->vm_function_control & 1);
+ vmcs_write64(EPTP_LIST_ADDRESS,
+ page_to_phys(vmx->nested.shadow_eptp_list));
+ }
+
/*
* This sets GUEST_CR0 to vmcs12->guest_cr0, possibly modifying those
* bits which we consider mandatory enabled.
--
2.9.4
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