On 12/10/2009 08:38 PM, or...@il.ibm.com wrote:
From: Orit Wasserman<or...@il.ibm.com>
@@ -287,7 +297,7 @@ static inline int vmcs_field_type(unsigned long field)
}
/*
- Returncs VMCS field size in bits
+ Returns VMCS field size in bits
*/
Fold.
static inline int vmcs_field_size(int field_type, struct kvm_vcpu *vcpu)
{
@@ -313,6 +323,10 @@ static inline int vmcs_field_size(int field_type, struct
kvm_vcpu *vcpu)
return 0;
}
+#define NESTED_VM_EXIT_CONTROLS_MASK (~(VM_EXIT_LOAD_IA32_PAT | \
+ VM_EXIT_SAVE_IA32_PAT))
+#define NESTED_VM_ENTRY_CONTROLS_MASK (~(VM_ENTRY_LOAD_IA32_PAT | \
+
I think a whitelist is better here, so if we add a new feature and
forget it here, we don't introduce a vulnerability.
+static inline int nested_cpu_has_vmx_tpr_shadow(struct kvm_vcpu *vcpu)
+{
+ return cpu_has_vmx_tpr_shadow()&&
+ get_shadow_vmcs(vcpu)->cpu_based_vm_exec_control&
+ CPU_BASED_TPR_SHADOW;
+}
bools are better.
+
+static inline int nested_cpu_has_secondary_exec_ctrls(struct kvm_vcpu *vcpu)
+{
+ return cpu_has_secondary_exec_ctrls()&&
+ get_shadow_vmcs(vcpu)->cpu_based_vm_exec_control&
+ CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
+}
+
+static inline bool nested_vm_need_virtualize_apic_accesses(struct kvm_vcpu
+ *vcpu)
+{
+ return get_shadow_vmcs(vcpu)->secondary_vm_exec_control&
+ SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
+}
Need to check for secondary controls first.
+
+static inline int nested_cpu_has_vmx_ept(struct kvm_vcpu *vcpu)
+{
+ return get_shadow_vmcs(vcpu)->
+ secondary_vm_exec_control& SECONDARY_EXEC_ENABLE_EPT;
+}
+
+static inline int nested_cpu_has_vmx_vpid(struct kvm_vcpu *vcpu)
+{
+ return get_shadow_vmcs(vcpu)->secondary_vm_exec_control&
+ SECONDARY_EXEC_ENABLE_VPID;
+}
A helper nested_check_2ndary_control() can help reduce duplication.
+
+static inline int nested_cpu_has_vmx_pat(struct kvm_vcpu *vcpu)
+{
+ return get_shadow_vmcs(vcpu)->vm_entry_controls&
+ VM_ENTRY_LOAD_IA32_PAT;
+}
Suggest dropping PAT support for now (it's optional in the spec IIRC,
and doesn't help much).
+
+void prepare_vmcs_12(struct kvm_vcpu *vcpu)
+{
Not sure what this does. From the name, it appears to prepare a vmcs.
From the contents, it appears to read the vmcs and save it into a
shadow vmcs.
+ struct shadow_vmcs *l2_shadow_vmcs =
+ get_shadow_vmcs(vcpu);
+
+ l2_shadow_vmcs->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR);
+ l2_shadow_vmcs->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR);
+ l2_shadow_vmcs->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR);
+ l2_shadow_vmcs->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR);
+ l2_shadow_vmcs->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR);
+ l2_shadow_vmcs->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR);
+ l2_shadow_vmcs->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR);
+ l2_shadow_vmcs->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR);
+
+ l2_shadow_vmcs->tsc_offset = vmcs_read64(TSC_OFFSET);
+ l2_shadow_vmcs->guest_physical_address =
+ vmcs_read64(GUEST_PHYSICAL_ADDRESS);
+ l2_shadow_vmcs->vmcs_link_pointer = vmcs_read64(VMCS_LINK_POINTER);
+ l2_shadow_vmcs->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
+ if (vmcs_config.vmentry_ctrl& VM_ENTRY_LOAD_IA32_PAT)
+ l2_shadow_vmcs->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT);
+ l2_shadow_vmcs->cr3_target_count = vmcs_read32(CR3_TARGET_COUNT);
+ l2_shadow_vmcs->vm_entry_intr_info_field =
+ vmcs_read32(VM_ENTRY_INTR_INFO_FIELD);
+ l2_shadow_vmcs->vm_entry_exception_error_code =
+ vmcs_read32(VM_ENTRY_EXCEPTION_ERROR_CODE);
+ l2_shadow_vmcs->vm_entry_instruction_len =
+ vmcs_read32(VM_ENTRY_INSTRUCTION_LEN);
+ l2_shadow_vmcs->vm_instruction_error =
+ vmcs_read32(VM_INSTRUCTION_ERROR);
+ l2_shadow_vmcs->vm_exit_reason = vmcs_read32(VM_EXIT_REASON);
+ l2_shadow_vmcs->vm_exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
+ l2_shadow_vmcs->vm_exit_intr_error_code =
+ vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
+ l2_shadow_vmcs->idt_vectoring_info_field =
+ vmcs_read32(IDT_VECTORING_INFO_FIELD);
+ l2_shadow_vmcs->idt_vectoring_error_code =
+ vmcs_read32(IDT_VECTORING_ERROR_CODE);
+ l2_shadow_vmcs->vm_exit_instruction_len =
+ vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+ l2_shadow_vmcs->vmx_instruction_info =
+ vmcs_read32(VMX_INSTRUCTION_INFO);
+ l2_shadow_vmcs->guest_es_limit = vmcs_read32(GUEST_ES_LIMIT);
+ l2_shadow_vmcs->guest_cs_limit = vmcs_read32(GUEST_CS_LIMIT);
+ l2_shadow_vmcs->guest_ss_limit = vmcs_read32(GUEST_SS_LIMIT);
+ l2_shadow_vmcs->guest_ds_limit = vmcs_read32(GUEST_DS_LIMIT);
+ l2_shadow_vmcs->guest_fs_limit = vmcs_read32(GUEST_FS_LIMIT);
+ l2_shadow_vmcs->guest_gs_limit = vmcs_read32(GUEST_GS_LIMIT);
+ l2_shadow_vmcs->guest_ldtr_limit = vmcs_read32(GUEST_LDTR_LIMIT);
+ l2_shadow_vmcs->guest_tr_limit = vmcs_read32(GUEST_TR_LIMIT);
+ l2_shadow_vmcs->guest_gdtr_limit = vmcs_read32(GUEST_GDTR_LIMIT);
+ l2_shadow_vmcs->guest_idtr_limit = vmcs_read32(GUEST_IDTR_LIMIT);
+ l2_shadow_vmcs->guest_es_ar_bytes = vmcs_read32(GUEST_ES_AR_BYTES);
+ l2_shadow_vmcs->guest_cs_ar_bytes = vmcs_read32(GUEST_CS_AR_BYTES);
+ l2_shadow_vmcs->guest_ss_ar_bytes = vmcs_read32(GUEST_SS_AR_BYTES);
+ l2_shadow_vmcs->guest_ds_ar_bytes = vmcs_read32(GUEST_DS_AR_BYTES);
+ l2_shadow_vmcs->guest_fs_ar_bytes = vmcs_read32(GUEST_FS_AR_BYTES);
+ l2_shadow_vmcs->guest_gs_ar_bytes = vmcs_read32(GUEST_GS_AR_BYTES);
+ l2_shadow_vmcs->guest_ldtr_ar_bytes = vmcs_read32(GUEST_LDTR_AR_BYTES);
+ l2_shadow_vmcs->guest_tr_ar_bytes = vmcs_read32(GUEST_TR_AR_BYTES);
+ l2_shadow_vmcs->guest_interruptibility_info =
+ vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
+ l2_shadow_vmcs->guest_activity_state =
+ vmcs_read32(GUEST_ACTIVITY_STATE);
+ l2_shadow_vmcs->guest_sysenter_cs = vmcs_read32(GUEST_SYSENTER_CS);
+
+ l2_shadow_vmcs->cr4_read_shadow = vmcs_readl(CR4_READ_SHADOW);
+ l2_shadow_vmcs->exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
If EXIT_QUALIFICATION is a physical address, don't you need to translate
it? vmx will store a host physical address and we need a guest physical
address.
+ l2_shadow_vmcs->guest_linear_address = vmcs_readl(GUEST_LINEAR_ADDRESS);
Not all processors support this.
+
+ if (l2_shadow_vmcs->cr0_guest_host_mask& X86_CR0_TS)
+ l2_shadow_vmcs->guest_cr0 = vmcs_readl(GUEST_CR0);
+ else /* if CR0_GUEST_HOST_MASK[TS]=0 l1 should think TS was really
written to CR0 */
+ l2_shadow_vmcs->guest_cr0 =
+ (vmcs_readl(GUEST_CR0)&~X86_CR0_TS) |
(vmcs_readl(CR0_READ_SHADOW)& X86_CR0_TS);
+
+ l2_shadow_vmcs->guest_cr4 = vmcs_readl(GUEST_CR4);
GUEST_CR4 will be different from the guest's view of it (for example,
without EPT CR4.PAE will always be set.
We also use CR4_GUEST_HOST_MASK, I think you need to account for that.
+ l2_shadow_vmcs->guest_es_base = vmcs_readl(GUEST_ES_BASE);
+ l2_shadow_vmcs->guest_cs_base = vmcs_readl(GUEST_CS_BASE);
+ l2_shadow_vmcs->guest_ss_base = vmcs_readl(GUEST_SS_BASE);
+ l2_shadow_vmcs->guest_ds_base = vmcs_readl(GUEST_DS_BASE);
+ l2_shadow_vmcs->guest_fs_base = vmcs_readl(GUEST_FS_BASE);
+ l2_shadow_vmcs->guest_gs_base = vmcs_readl(GUEST_GS_BASE);
+ l2_shadow_vmcs->guest_ldtr_base = vmcs_readl(GUEST_LDTR_BASE);
+ l2_shadow_vmcs->guest_tr_base = vmcs_readl(GUEST_TR_BASE);
+ l2_shadow_vmcs->guest_gdtr_base = vmcs_readl(GUEST_GDTR_BASE);
+ l2_shadow_vmcs->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE);
+ l2_shadow_vmcs->guest_dr7 = vmcs_readl(GUEST_DR7);
+ l2_shadow_vmcs->guest_rsp = vmcs_readl(GUEST_RSP);
+ l2_shadow_vmcs->guest_rip = vmcs_readl(GUEST_RIP);
+ l2_shadow_vmcs->guest_rflags = vmcs_readl(GUEST_RFLAGS);
+ l2_shadow_vmcs->guest_pending_dbg_exceptions =
+ vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS);
+ l2_shadow_vmcs->guest_sysenter_esp = vmcs_readl(GUEST_SYSENTER_ESP);
+ l2_shadow_vmcs->guest_sysenter_eip = vmcs_readl(GUEST_SYSENTER_EIP);
+}
+
+int load_vmcs_common(struct shadow_vmcs *src)
+{
+ vmcs_write16(GUEST_ES_SELECTOR, src->guest_es_selector);
+ vmcs_write16(GUEST_CS_SELECTOR, src->guest_cs_selector);
+ vmcs_write16(GUEST_SS_SELECTOR, src->guest_ss_selector);
+ vmcs_write16(GUEST_DS_SELECTOR, src->guest_ds_selector);
+ vmcs_write16(GUEST_FS_SELECTOR, src->guest_fs_selector);
+ vmcs_write16(GUEST_GS_SELECTOR, src->guest_gs_selector);
+ vmcs_write16(GUEST_LDTR_SELECTOR, src->guest_ldtr_selector);
+ vmcs_write16(GUEST_TR_SELECTOR, src->guest_tr_selector);
+
+ vmcs_write64(GUEST_IA32_DEBUGCTL, src->guest_ia32_debugctl);
+
+ if (vmcs_config.vmentry_ctrl& VM_ENTRY_LOAD_IA32_PAT)
+ vmcs_write64(GUEST_IA32_PAT, src->guest_ia32_pat);
This is dangerous, the guest can cause inconsistent page types and
processor lockups.
+
+ if (src->vm_entry_msr_load_count< 512)
+ vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT,
src->vm_entry_msr_load_count);
Ditto. MSRs have to be validated. This feature is optional, right?
Suggest we don't support it for now.
+ vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS,
+ src->guest_pending_dbg_exceptions);
I think this is a new field.
static struct level_state *create_state(void)
{
struct level_state *state = NULL;
@@ -2301,8 +2578,6 @@ static void free_l1_state(struct kvm_vcpu *vcpu)
kfree(list_item);
}
}
-
-
?
@@ -3574,6 +3849,10 @@ static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ if (vmx->nested.nested_mode) {
+ return;
+ }
+
No braces on single-line if statements in kernel code.
if (!cpu_has_virtual_nmis()) {
/*
* Tracking the NMI-blocked state in software is built upon
@@ -3759,7 +4038,12 @@ static int handle_exception(struct kvm_vcpu *vcpu)
return 1; /* already handled by vmx_vcpu_run() */
if (is_no_device(intr_info)) {
+ /* if l0 handled an fpu operation for l2 it's because l1 is
+ not interested (exception bitmap 12 does not include
NM_VECTOR)
+ enable fpu and resume l2 (avoid switching to l1)
+ */
Use standard comment style please.
vmx_fpu_activate(vcpu);
+
return 1;
}
@@ -4504,7 +4793,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
static int handle_vmptrld(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
- u64 guest_vmcs_addr;
+ gpa_t guest_vmcs_addr;
Fold.
@@ -4895,7 +5184,6 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
= vmcs_read32(VM_INSTRUCTION_ERROR);
return 0;
}
-
?
if ((vectoring_info& VECTORING_INFO_VALID_MASK)&&
(exit_reason != EXIT_REASON_EXCEPTION_NMI&&
exit_reason != EXIT_REASON_EPT_VIOLATION&&
@@ -4903,8 +5191,7 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
printk(KERN_WARNING "%s: unexpected, valid vectoring info "
"(0x%x) and exit reason is 0x%x\n",
__func__, vectoring_info, exit_reason);
-
- if (unlikely(!cpu_has_virtual_nmis()&& vmx->soft_vnmi_blocked)) {
+ if (!vmx->nested.nested_mode&& unlikely(!cpu_has_virtual_nmis()&&
vmx->soft_vnmi_blocked)) {
Why is this different for nested mode? At least, you have to check if
the guest is intercepting nmis.
if (vmx_interrupt_allowed(vcpu)) {
vmx->soft_vnmi_blocked = 0;
} else if (vmx->vnmi_blocked_time> 1000000000LL&&
@@ -4951,10 +5238,13 @@ static void vmx_complete_interrupts(struct vcpu_vmx
*vmx)
int type;
bool idtv_info_valid;
- exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
-
vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
+ if (vmx->nested.nested_mode)
+ return;
Again, I think you have to check if the guest is intercepting interrupts.
+
+ exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
+
/* Handle machine checks before interrupts are enabled */
if ((vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)
|| (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI
@@ -5068,6 +5358,7 @@ static void fixup_rmode_irq(struct vcpu_vmx *vmx)
static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 nested_exception_bitmap = 0;
/* Record the guest's net vcpu time for enforced NMI injections. */
if (unlikely(!cpu_has_virtual_nmis()&& vmx->soft_vnmi_blocked))
@@ -5099,6 +5390,37 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
if (vcpu->arch.switch_db_regs)
set_debugreg(vcpu->arch.dr6, 6);
+ if (vcpu->fpu_active) {
+ if (vmcs_readl(CR0_READ_SHADOW)& X86_CR0_TS)
+ vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
+ else
+ vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
+
+ if (vmx->nested.nested_mode) {
+ if (!nested_map_current(vcpu)) {
+ vmx->fail = 1;
+ return;
+ }
+
+ nested_exception_bitmap = get_shadow_vmcs(vcpu)->
+ exception_bitmap;
+
+ nested_unmap_current(vcpu);
+ }
+
+ if (vmx->nested.nested_mode&&
+ (nested_exception_bitmap& (1u<< NM_VECTOR)))
+ vmcs_write32(EXCEPTION_BITMAP,
+ vmcs_read32(EXCEPTION_BITMAP) | (1u<<
NM_VECTOR));
+ else
+ vmcs_write32(EXCEPTION_BITMAP,
+ vmcs_read32(EXCEPTION_BITMAP)& ~(1u<<
NM_VECTOR));
I'd like to see generalized handling of the exception bitmap in
update_exception_bitmap(), not something ad-hoc.
+ } else {
+ vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
+ vmcs_write32(EXCEPTION_BITMAP,
+ vmcs_read32(EXCEPTION_BITMAP) | (1u<<
NM_VECTOR));
+ }
This looks confused wrt the previous patch.
+void save_vmcs(struct shadow_vmcs *dst)
+{
+ dst->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR);
+ dst->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR);
+ dst->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR);
+ dst->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR);
+ dst->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR);
+ dst->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR);
+ dst->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR);
+ dst->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR);
+ dst->host_es_selector = vmcs_read16(HOST_ES_SELECTOR);
+ dst->host_cs_selector = vmcs_read16(HOST_CS_SELECTOR);
+ dst->host_ss_selector = vmcs_read16(HOST_SS_SELECTOR);
+ dst->host_ds_selector = vmcs_read16(HOST_DS_SELECTOR);
+ dst->host_fs_selector = vmcs_read16(HOST_FS_SELECTOR);
+ dst->host_gs_selector = vmcs_read16(HOST_GS_SELECTOR);
+ dst->host_tr_selector = vmcs_read16(HOST_TR_SELECTOR);
+ dst->io_bitmap_a = vmcs_read64(IO_BITMAP_A);
+ dst->io_bitmap_b = vmcs_read64(IO_BITMAP_B);
+ if (cpu_has_vmx_msr_bitmap())
+ dst->msr_bitmap = vmcs_read64(MSR_BITMAP);
Instead of reading and writing the host parts, which don't change, I'd
like to see the vmcs host initialization factored out and reused.
+
+ dst->vm_exit_msr_store_addr = vmcs_read64(VM_EXIT_MSR_STORE_ADDR);
+ dst->vm_exit_msr_load_addr = vmcs_read64(VM_EXIT_MSR_LOAD_ADDR);
+ dst->vm_entry_msr_load_addr = vmcs_read64(VM_ENTRY_MSR_LOAD_ADDR);
We don't use those.
+}
+
+int prepare_vmcs_02(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ struct shadow_vmcs *src , *l1_shadow_vmcs = vmx->nested.l1_shadow_vmcs;
+ struct level_state *l2_state;
+ u32 exec_control;
+
+ src = get_shadow_vmcs(vcpu);
+ if (!src) {
+ nested_unmap_current(vcpu);
+ printk(KERN_INFO "%s: Error no shadow vmcs\n", __func__);
+ return 1;
+ }
+
+ load_vmcs_common(src);
+
+ l2_state =&(vmx->nested.current_l2_page->l2_state);
+
+ if (l2_state->first_launch) {
+
+ vmcs_write64(VMCS_LINK_POINTER, src->vmcs_link_pointer);
Looks wrong. The address needs translation at least. Not sure what it
does?
+
+ if (l2_state->io_bitmap_a)
+ vmcs_write64(IO_BITMAP_A, l2_state->io_bitmap_a);
+
+ if (l2_state->io_bitmap_b)
+ vmcs_write64(IO_BITMAP_B, l2_state->io_bitmap_b);
Address translation? Also, need to mask with the host's I/O bitmap.
+
+ if (l2_state->msr_bitmap)
+ vmcs_write64(MSR_BITMAP, l2_state->msr_bitmap);
Need to mask with the host's msr bitmap.
+
+ if (src->vm_entry_msr_load_count> 0) {
+ struct page *page;
+
+ page = nested_get_page(vcpu,
+ src->vm_entry_msr_load_addr);
+ if (!page)
+ return 1;
+
+ vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR,
page_to_phys(page));
+
+ kvm_release_page_clean(page);
I don't see how we can trust the guest's msr autoload.
+
+ vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK,
+ (l1_shadow_vmcs->page_fault_error_code_mask&
+ src->page_fault_error_code_mask));
+
+ vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH,
+ (l1_shadow_vmcs->page_fault_error_code_match&
+ src->page_fault_error_code_match));
+
I don't think this is right. If both masks are 1 but host match is 1
and guest match is 0, we will trap only on the guest's idea of PFEC
matching.
Also, if the guest has bit 14 clear in EXCEPTION_BITMAP, this needs to
be done completely differently.
I didn't see where PFEC matchin is handled in the exception handler?
+ if (cpu_has_secondary_exec_ctrls()) {
+
+ exec_control =
+ l1_shadow_vmcs->secondary_vm_exec_control;
+
+ if (nested_cpu_has_secondary_exec_ctrls(vcpu)) {
+
+ exec_control |= src->secondary_vm_exec_control;
+
+ if
(!vm_need_virtualize_apic_accesses(vcpu->kvm) ||
+
!nested_vm_need_virtualize_apic_accesses(vcpu))
+ exec_control&=
+
~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
+ }
+
+ vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
+ }
+
+ load_vmcs_host_state(l1_shadow_vmcs);
+
+ l2_state->first_launch = false;
+ }
How are all those calculations redone if the guest changes one of those
controls?
+
+ if (vm_need_tpr_shadow(vcpu->kvm)&&
+ nested_cpu_has_vmx_tpr_shadow(vcpu))
+ vmcs_write32(TPR_THRESHOLD, src->tpr_threshold);
If the guest doesn't trap interrupts, we need to stay with the host tpr
threshold.
+
+ if (enable_ept) {
+ if (!nested_cpu_has_vmx_ept(vcpu)) {
+ vmcs_write64(EPT_POINTER,
+ l1_shadow_vmcs->ept_pointer);
+ vmcs_write64(GUEST_PDPTR0,
+ l1_shadow_vmcs->guest_pdptr0);
+ vmcs_write64(GUEST_PDPTR1,
+ l1_shadow_vmcs->guest_pdptr1);
+ vmcs_write64(GUEST_PDPTR2,
+ l1_shadow_vmcs->guest_pdptr2);
+ vmcs_write64(GUEST_PDPTR3,
+ l1_shadow_vmcs->guest_pdptr3);
+ }
+ }
This version doesn't support ept, so please drop.
+
+ exec_control = l1_shadow_vmcs->cpu_based_vm_exec_control;
+
+ exec_control&= ~CPU_BASED_VIRTUAL_INTR_PENDING;
+
+ exec_control&= ~CPU_BASED_VIRTUAL_NMI_PENDING;
+
+ exec_control&= ~CPU_BASED_TPR_SHADOW;
+
+ exec_control |= src->cpu_based_vm_exec_control;
Need to whitelist good bits.
+void sync_cached_regs_to_vmcs(struct kvm_vcpu *vcpu)
+{
+ unsigned long mask;
+
+ if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
+ vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
+ if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
+ vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
+
+ mask = ~((1<< VCPU_REGS_RSP) | (1<< VCPU_REGS_RIP));
+
+ if (vcpu->arch.regs_dirty& mask) {
+ printk(KERN_INFO "WARNING: dirty cached registers regs_dirty 0x%x
mask 0x%lx\n",
+ vcpu->arch.regs_dirty, mask);
+ WARN_ON(1);
+ }
+
+ vcpu->arch.regs_dirty = 0;
+}
Split into a separate patch (and use in existing code which already does
this).
--
error compiling committee.c: too many arguments to function
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