LoongArch: KVM: Delay secondary mmu tlb flush until guest entry

With hardware assisted virtualization, there are two level HW mmu, one
is GVA to GPA mapping, the other is GPA to HPA mapping which is called
secondary mmu in generic. If there is page fault for secondary mmu,
there needs tlb flush operation indexed with fault GPA address and VMID.
VMID is stored at register CSR.GSTAT and will be reload or recalculated
before guest entry.

Currently CSR.GSTAT is not saved and restored during VCPU context
switch, instead it is recalculated during guest entry. So CSR.GSTAT is
effective only when a VCPU runs in guest mode, however it may not be
effective if the VCPU exits to host mode. Since register CSR.GSTAT may
be stale, it may records the VMID of the last schedule-out VCPU, rather
than the current VCPU.

Function kvm_flush_tlb_gpa() should be called with its real VMID, so
here move it to the guest entrance. Also an arch-specific request id
KVM_REQ_TLB_FLUSH_GPA is added to flush tlb for secondary mmu, and it
can be optimized if VMID is updated, since all guest tlb entries will
be invalid if VMID is updated.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h
index c87b6ea0ec47..32c4948f534f 100644
--- a/arch/loongarch/include/asm/kvm_host.h
+++ b/arch/loongarch/include/asm/kvm_host.h
@@ -30,6 +30,7 @@
 #define KVM_PRIVATE_MEM_SLOTS		0
 
 #define KVM_HALT_POLL_NS_DEFAULT	500000
+#define KVM_REQ_TLB_FLUSH_GPA		KVM_ARCH_REQ(0)
 
 #define KVM_GUESTDBG_SW_BP_MASK		\
 	(KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)
@@ -190,6 +191,7 @@ struct kvm_vcpu_arch {
 
 	/* vcpu's vpid */
 	u64 vpid;
+	gpa_t flush_gpa;
 
 	/* Frequency of stable timer in Hz */
 	u64 timer_mhz;