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kvm: vmx: Support INVPCID in shadow paging mode

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Implement support for INVPCID in shadow paging mode as well.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Junaid Shahid 2018-06-27 14:59:14 -07:00 committed by Paolo Bonzini
parent c9470a2e28
commit eb4b248e15
3 changed files with 112 additions and 3 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -1317,6 +1317,7 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u64 error_code,
void *insn, int insn_len);
void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid);
void kvm_mmu_new_cr3(struct kvm_vcpu *vcpu, gpa_t new_cr3);
void kvm_enable_tdp(void);

18
arch/x86/kvm/mmu.c
View File

@ -5187,6 +5187,24 @@ void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
}
EXPORT_SYMBOL_GPL(kvm_mmu_invlpg);
void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid)
{
struct kvm_mmu *mmu = &vcpu->arch.mmu;
if (pcid == kvm_get_active_pcid(vcpu)) {
mmu->invlpg(vcpu, gva);
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
}
++vcpu->stat.invlpg;
/*
* Mappings not reachable via the current cr3 will be synced when
* switching to that cr3, so nothing needs to be done here for them.
*/
}
EXPORT_SYMBOL_GPL(kvm_mmu_invpcid_gva);
void kvm_enable_tdp(void)
{
tdp_enabled = true;

96
arch/x86/kvm/vmx.c
View File

@ -3065,7 +3065,7 @@ static bool vmx_rdtscp_supported(void)
static bool vmx_invpcid_supported(void)
{
return cpu_has_vmx_invpcid() && enable_ept;
return cpu_has_vmx_invpcid();
}
/*
@ -6101,8 +6101,6 @@ static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx)
if (!enable_ept) {
exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
enable_unrestricted_guest = 0;
/* Enable INVPCID for non-ept guests may cause performance regression. */
exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID;
}
if (!enable_unrestricted_guest)
exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
@ -8756,6 +8754,97 @@ static int handle_invvpid(struct kvm_vcpu *vcpu)
return kvm_skip_emulated_instruction(vcpu);
}
static int handle_invpcid(struct kvm_vcpu *vcpu)
{
u32 vmx_instruction_info;
unsigned long type;
bool pcid_enabled;
gva_t gva;
struct x86_exception e;
struct {
u64 pcid;
u64 gla;
} operand;
if (!guest_cpuid_has(vcpu, X86_FEATURE_INVPCID)) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf);
if (type > 3) {
kvm_inject_gp(vcpu, 0);
return 1;
}
/* According to the Intel instruction reference, the memory operand
* is read even if it isn't needed (e.g., for type==all)
*/
if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
vmx_instruction_info, false, &gva))
return 1;
if (kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e)) {
kvm_inject_page_fault(vcpu, &e);
return 1;
}
if (operand.pcid >> 12 != 0) {
kvm_inject_gp(vcpu, 0);
return 1;
}
pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE);
switch (type) {
case INVPCID_TYPE_INDIV_ADDR:
if ((!pcid_enabled && (operand.pcid != 0)) ||
is_noncanonical_address(operand.gla, vcpu)) {
kvm_inject_gp(vcpu, 0);
return 1;
}
kvm_mmu_invpcid_gva(vcpu, operand.gla, operand.pcid);
return kvm_skip_emulated_instruction(vcpu);
case INVPCID_TYPE_SINGLE_CTXT:
if (!pcid_enabled && (operand.pcid != 0)) {
kvm_inject_gp(vcpu, 0);
return 1;
}
if (kvm_get_active_pcid(vcpu) == operand.pcid) {
kvm_mmu_sync_roots(vcpu);
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
}
/*
* If the current cr3 does not use the given PCID, then nothing
* needs to be done here because a resync will happen anyway
* before switching to any other CR3.
*/
return kvm_skip_emulated_instruction(vcpu);
case INVPCID_TYPE_ALL_NON_GLOBAL:
/*
* Currently, KVM doesn't mark global entries in the shadow
* page tables, so a non-global flush just degenerates to a
* global flush. If needed, we could optimize this later by
* keeping track of global entries in shadow page tables.
*/
/* fall-through */
case INVPCID_TYPE_ALL_INCL_GLOBAL:
kvm_mmu_unload(vcpu);
return kvm_skip_emulated_instruction(vcpu);
default:
BUG(); /* We have already checked above that type <= 3 */
}
}
static int handle_pml_full(struct kvm_vcpu *vcpu)
{
unsigned long exit_qualification;
@ -8959,6 +9048,7 @@ static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
[EXIT_REASON_XSAVES] = handle_xsaves,
[EXIT_REASON_XRSTORS] = handle_xrstors,
[EXIT_REASON_PML_FULL] = handle_pml_full,
[EXIT_REASON_INVPCID] = handle_invpcid,
[EXIT_REASON_VMFUNC] = handle_vmfunc,
[EXIT_REASON_PREEMPTION_TIMER] = handle_preemption_timer,
};