Hi,
the following patch adds support for the GUEST_SMBASE field in the VMCS for
the case of nested virtualization. There are hypervisors that try to access
that mandatory field. The patch avoids returning a "unsupported vmcs field"
error to the L1 hypervisor by adding the GUEST_SMBASE field into the vmcs12
struct.
Regards,
Matthias.
---
arch/x86/include/asm/vmx.h | 1 +
arch/x86/kvm/vmx.c | 6 +++++-
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 31f180c..6a14720 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -194,6 +194,7 @@ enum vmcs_field {
GUEST_TR_AR_BYTES = 0x00004822,
GUEST_INTERRUPTIBILITY_INFO = 0x00004824,
GUEST_ACTIVITY_STATE = 0X00004826,
+ GUEST_SMBASE = 0x00004828,
GUEST_SYSENTER_CS = 0x0000482A,
HOST_IA32_SYSENTER_CS = 0x00004c00,
CR0_GUEST_HOST_MASK = 0x00006000,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 32eb588..88e21e9 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -294,7 +294,8 @@ struct __packed vmcs12 {
u32 guest_activity_state;
u32 guest_sysenter_cs;
u32 host_ia32_sysenter_cs;
- u32 padding32[8]; /* room for future expansion */
+ u32 guest_smbase;
+ u32 padding32[7]; /* room for future expansion */
u16 virtual_processor_id;
u16 guest_es_selector;
u16 guest_cs_selector;
@@ -556,6 +557,7 @@ static unsigned short vmcs_field_to_offset_table[] = {
FIELD(GUEST_TR_BASE, guest_tr_base),
FIELD(GUEST_GDTR_BASE, guest_gdtr_base),
FIELD(GUEST_IDTR_BASE, guest_idtr_base),
+ FIELD(GUEST_SMBASE, guest_smbase),
FIELD(GUEST_DR7, guest_dr7),
FIELD(GUEST_RSP, guest_rsp),
FIELD(GUEST_RIP, guest_rip),
@@ -6536,6 +6538,7 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct
vmcs12 *vmcs12)
vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
vmcs12->guest_interruptibility_info);
vmcs_write32(GUEST_ACTIVITY_STATE, vmcs12->guest_activity_state);
+ vmcs_write32(GUEST_SMBASE, vmcs12->guest_smbase);
vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs);
vmcs_writel(GUEST_DR7, vmcs12->guest_dr7);
vmcs_writel(GUEST_RFLAGS, vmcs12->guest_rflags);
@@ -6937,6 +6940,7 @@ void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12
*vmcs12)
vmcs12->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE);
vmcs12->guest_activity_state = vmcs_read32(GUEST_ACTIVITY_STATE);
+ vmcs12->guest_smbase = vmcs_read32(GUEST_SMBASE);
vmcs12->guest_interruptibility_info =
vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
vmcs12->guest_pending_dbg_exceptions =
--
1.7.9.5
--
Dipl.-Inf. Matthias Lange <[email protected]>
Security in Telecommunications
TU Berlin / Telekom Innovation Laboratories
Ernst-Reuter-Platz 7, 10587 Berlin
Phone: +49 - 30 - 8353 58 553
Mobile: +49 - 160 - 587 28 07
Web: http://www.t-labs.tu-berlin.de/sect
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