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KVM: nVMX: delay loading of PDPTRs to KVM_REQ_GET_NESTED_STATE_PAGES 

Similar to the rest of guest page accesses after a migration,
this access should be delayed to KVM_REQ_GET_NESTED_STATE_PAGES.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210607090203.133058-6-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2021-06-07 12:02:00 +03:00 committed by Paolo Bonzini
parent b222b0b881
commit 0f85722341
1 changed files with 18 additions and 5 deletions
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23
arch/x86/kvm/vmx/nested.c
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@ -1105,7 +1105,8 @@ static bool nested_vmx_transition_mmu_sync(struct kvm_vcpu *vcpu)
* Exit Qualification (for a VM-Entry consistency check VM-Exit) is assigned to
* @entry_failure_code.
*/
static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool nested_ept,
static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
bool nested_ept, bool reload_pdptrs,
enum vm_entry_failure_code *entry_failure_code)
{
if (CC(kvm_vcpu_is_illegal_gpa(vcpu, cr3))) {
@ -1117,7 +1118,7 @@ static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool ne
* If PAE paging and EPT are both on, CR3 is not used by the CPU and
* must not be dereferenced.
*/
if (!nested_ept && is_pae_paging(vcpu) &&
if (reload_pdptrs && !nested_ept && is_pae_paging(vcpu) &&
CC(!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))) {
*entry_failure_code = ENTRY_FAIL_PDPTE;
return -EINVAL;
@ -2487,6 +2488,7 @@ static void prepare_vmcs02_rare(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
* is assigned to entry_failure_code on failure.
*/
static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
bool from_vmentry,
enum vm_entry_failure_code *entry_failure_code)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@ -2579,7 +2581,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
/* Shadow page tables on either EPT or shadow page tables. */
if (nested_vmx_load_cr3(vcpu, vmcs12->guest_cr3, nested_cpu_has_ept(vmcs12),
entry_failure_code))
from_vmentry, entry_failure_code))
return -EINVAL;
/*
@ -3120,6 +3122,17 @@ static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
struct page *page;
u64 hpa;
if (!nested_cpu_has_ept(vmcs12) && is_pae_paging(vcpu)) {
/*
* Reload the guest's PDPTRs since after a migration
* the guest CR3 might be restored prior to setting the nested
* state which can lead to a load of wrong PDPTRs.
*/
if (CC(!load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3)))
return false;
}
if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
/*
* Translate L1 physical address to host physical
@ -3371,7 +3384,7 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu,
enter_guest_mode(vcpu);
if (prepare_vmcs02(vcpu, vmcs12, &entry_failure_code)) {
if (prepare_vmcs02(vcpu, vmcs12, from_vmentry, &entry_failure_code)) {
exit_reason.basic = EXIT_REASON_INVALID_STATE;
vmcs12->exit_qualification = entry_failure_code;
goto vmentry_fail_vmexit_guest_mode;
@ -4226,7 +4239,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
* Only PDPTE load can fail as the value of cr3 was checked on entry and
* couldn't have changed.
*/
if (nested_vmx_load_cr3(vcpu, vmcs12->host_cr3, false, &ignored))
if (nested_vmx_load_cr3(vcpu, vmcs12->host_cr3, false, true, &ignored))
nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_PDPTE_FAIL);
nested_vmx_transition_tlb_flush(vcpu, vmcs12, false);