[PATCH v7 3/4] KVM: X86: introduce invalidate_gpa argument to tlb flush

Wanpeng Li
2017-11-30T06:01:54Z

From: Wanpeng Li <wanpeng.li@hotmail.com>

Introduce a new bool invalidate_gpa argument to kvm_x86_ops->tlb_flush,
it will be used by later patches to just flush guest tlb.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
---
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/svm.c | 14 +++++++-------
arch/x86/kvm/vmx.c | 21 +++++++++++----------
arch/x86/kvm/x86.c | 6 +++---
4 files changed, 22 insertions(+), 21 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b97726e..63d34bc 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -952,7 +952,7 @@ struct kvm_x86_ops {
unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);

- void (*tlb_flush)(struct kvm_vcpu *vcpu);
+ void (*tlb_flush)(struct kvm_vcpu *vcpu, bool invalidate_gpa);

void (*run)(struct kvm_vcpu *vcpu);
int (*handle_exit)(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1f3e7f2..14cca8c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -285,7 +285,7 @@ static int vgif = true;
module_param(vgif, int, 0444);

static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
-static void svm_flush_tlb(struct kvm_vcpu *vcpu);
+static void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa);
static void svm_complete_interrupts(struct vcpu_svm *svm);

static int nested_svm_exit_handled(struct vcpu_svm *svm);
@@ -2035,7 +2035,7 @@ static int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
return 1;

if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
- svm_flush_tlb(vcpu);
+ svm_flush_tlb(vcpu, true);

vcpu->arch.cr4 = cr4;
if (!npt_enabled)
@@ -2385,7 +2385,7 @@ static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,

svm->vmcb->control.nested_cr3 = __sme_set(root);
mark_dirty(svm->vmcb, VMCB_NPT);
- svm_flush_tlb(vcpu);
+ svm_flush_tlb(vcpu, true);
}

static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
@@ -2989,7 +2989,7 @@ static void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
svm->nested.intercept = nested_vmcb->control.intercept;

- svm_flush_tlb(&svm->vcpu);
+ svm_flush_tlb(&svm->vcpu, true);
svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
svm->vcpu.arch.hflags |= HF_VINTR_MASK;
@@ -4785,7 +4785,7 @@ static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
return 0;
}

-static void svm_flush_tlb(struct kvm_vcpu *vcpu)
+static void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa)
{
struct vcpu_svm *svm = to_svm(vcpu);

@@ -5076,7 +5076,7 @@ static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)

svm->vmcb->save.cr3 = __sme_set(root);
mark_dirty(svm->vmcb, VMCB_CR);
- svm_flush_tlb(vcpu);
+ svm_flush_tlb(vcpu, true);
}

static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
@@ -5090,7 +5090,7 @@ static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
svm->vmcb->save.cr3 = kvm_read_cr3(vcpu);
mark_dirty(svm->vmcb, VMCB_CR);

- svm_flush_tlb(vcpu);
+ svm_flush_tlb(vcpu, true);
}

static int is_disabled(void)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index b10d203..8c7e816 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4136,9 +4136,10 @@ static void exit_lmode(struct kvm_vcpu *vcpu)

#endif

-static inline void __vmx_flush_tlb(struct kvm_vcpu *vcpu, int vpid)
+static inline void __vmx_flush_tlb(struct kvm_vcpu *vcpu, int vpid,
+ bool invalidate_gpa)
{
- if (enable_ept) {
+ if (enable_ept && (invalidate_gpa || !enable_vpid)) {
if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
return;
ept_sync_context(construct_eptp(vcpu, vcpu->arch.mmu.root_hpa));
@@ -4147,15 +4148,15 @@ static inline void __vmx_flush_tlb(struct kvm_vcpu *vcpu, int vpid)
}
}

-static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
+static void vmx_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa)
{
- __vmx_flush_tlb(vcpu, to_vmx(vcpu)->vpid);
+ __vmx_flush_tlb(vcpu, to_vmx(vcpu)->vpid, invalidate_gpa);
}

static void vmx_flush_tlb_ept_only(struct kvm_vcpu *vcpu)
{
if (enable_ept)
- vmx_flush_tlb(vcpu);
+ vmx_flush_tlb(vcpu, true);
}

static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
@@ -4353,7 +4354,7 @@ static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
ept_load_pdptrs(vcpu);
}

- vmx_flush_tlb(vcpu);
+ vmx_flush_tlb(vcpu, true);
vmcs_writel(GUEST_CR3, guest_cr3);
}

@@ -8026,7 +8027,7 @@ static int handle_invvpid(struct kvm_vcpu *vcpu)
return kvm_skip_emulated_instruction(vcpu);
}

- __vmx_flush_tlb(vcpu, vmx->nested.vpid02);
+ __vmx_flush_tlb(vcpu, vmx->nested.vpid02, true);
nested_vmx_succeed(vcpu);

return kvm_skip_emulated_instruction(vcpu);
@@ -10710,11 +10711,11 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->nested.vpid02);
if (vmcs12->virtual_processor_id != vmx->nested.last_vpid) {
vmx->nested.last_vpid = vmcs12->virtual_processor_id;
- __vmx_flush_tlb(vcpu, to_vmx(vcpu)->nested.vpid02);
+ __vmx_flush_tlb(vcpu, to_vmx(vcpu)->nested.vpid02, true);
}
} else {
vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
- vmx_flush_tlb(vcpu);
+ vmx_flush_tlb(vcpu, true);
}

}
@@ -11424,7 +11425,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
* L1's vpid. TODO: move to a more elaborate solution, giving
* each L2 its own vpid and exposing the vpid feature to L1.
*/
- vmx_flush_tlb(vcpu);
+ vmx_flush_tlb(vcpu, true);
}
/* Restore posted intr vector. */
if (nested_cpu_has_posted_intr(vmcs12))
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bc501aa..c279530 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6775,10 +6775,10 @@ static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap);
}

-static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vcpu)
+static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa)
{
++vcpu->stat.tlb_flush;
- kvm_x86_ops->tlb_flush(vcpu);
+ kvm_x86_ops->tlb_flush(vcpu, invalidate_gpa);
}

void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu)
@@ -6835,7 +6835,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
kvm_mmu_sync_roots(vcpu);
if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
- kvm_vcpu_flush_tlb(vcpu);
+ kvm_vcpu_flush_tlb(vcpu, true);
if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
r = 0;
--
2.7.4