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Subject[Resend PATCH V5 4/10] KVM/VMX: Add hv tlb range flush support
Date
From: Lan Tianyu <Tianyu.Lan@microsoft.com>

This patch is to register tlb_remote_flush_with_range callback with
hv tlb range flush interface.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
Change since v4:
- Use new function kvm_fill_hv_flush_list_func() to fill flush
request.
Change since v3:
- Merge Vitaly's don't pass EPT configuration info to
vmx_hv_remote_flush_tlb() fix.
Change since v1:
- Pass flush range with new hyper-v tlb flush struct rather
than KVM tlb flush struct.
---
arch/x86/kvm/vmx.c | 63 +++++++++++++++++++++++++++++++++++++++---------------
1 file changed, 46 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2356118ea440..bad2aa6c5ca1 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1569,7 +1569,34 @@ static void check_ept_pointer_match(struct kvm *kvm)
to_kvm_vmx(kvm)->ept_pointers_match = EPT_POINTERS_MATCH;
}

-static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
+int kvm_fill_hv_flush_list_func(struct hv_guest_mapping_flush_list *flush,
+ void *data)
+{
+ struct kvm_tlb_range *range = data;
+
+ return hyperv_fill_flush_guest_mapping_list(flush, range->start_gfn,
+ range->pages);
+}
+
+static inline int __hv_remote_flush_tlb_with_range(struct kvm *kvm,
+ struct kvm_vcpu *vcpu, struct kvm_tlb_range *range)
+{
+ u64 ept_pointer = to_vmx(vcpu)->ept_pointer;
+
+ /*
+ * FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE hypercall needs address
+ * of the base of EPT PML4 table, strip off EPT configuration
+ * information.
+ */
+ if (range)
+ return hyperv_flush_guest_mapping_range(ept_pointer & PAGE_MASK,
+ kvm_fill_hv_flush_list_func, (void *)range);
+ else
+ return hyperv_flush_guest_mapping(ept_pointer & PAGE_MASK);
+}
+
+static int hv_remote_flush_tlb_with_range(struct kvm *kvm,
+ struct kvm_tlb_range *range)
{
struct kvm_vcpu *vcpu;
int ret = -ENOTSUPP, i;
@@ -1579,29 +1606,26 @@ static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
if (to_kvm_vmx(kvm)->ept_pointers_match == EPT_POINTERS_CHECK)
check_ept_pointer_match(kvm);

- /*
- * FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE hypercall needs the address of the
- * base of EPT PML4 table, strip off EPT configuration information.
- * If ept_pointer is invalid pointer, bypass the flush request.
- */
if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) {
kvm_for_each_vcpu(i, vcpu, kvm) {
- u64 ept_pointer = to_vmx(vcpu)->ept_pointer;
-
- if (!VALID_PAGE(ept_pointer))
- continue;
-
- ret |= hyperv_flush_guest_mapping(
- ept_pointer & PAGE_MASK);
+ /* If ept_pointer is invalid pointer, bypass flush request. */
+ if (VALID_PAGE(to_vmx(vcpu)->ept_pointer))
+ ret |= __hv_remote_flush_tlb_with_range(
+ kvm, vcpu, range);
}
} else {
- ret = hyperv_flush_guest_mapping(
- to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer & PAGE_MASK);
+ ret = __hv_remote_flush_tlb_with_range(kvm,
+ kvm_get_vcpu(kvm, 0), range);
}

spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
return ret;
}
+
+static int hv_remote_flush_tlb(struct kvm *kvm)
+{
+ return hv_remote_flush_tlb_with_range(kvm, NULL);
+}
#else /* !IS_ENABLED(CONFIG_HYPERV) */
static inline void evmcs_write64(unsigned long field, u64 value) {}
static inline void evmcs_write32(unsigned long field, u32 value) {}
@@ -7971,8 +7995,11 @@ static __init int hardware_setup(void)

#if IS_ENABLED(CONFIG_HYPERV)
if (ms_hyperv.nested_features & HV_X64_NESTED_GUEST_MAPPING_FLUSH
- && enable_ept)
- kvm_x86_ops->tlb_remote_flush = vmx_hv_remote_flush_tlb;
+ && enable_ept) {
+ kvm_x86_ops->tlb_remote_flush = hv_remote_flush_tlb;
+ kvm_x86_ops->tlb_remote_flush_with_range =
+ hv_remote_flush_tlb_with_range;
+ }
#endif

if (!cpu_has_vmx_ple()) {
@@ -11612,6 +11639,8 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
vmx->nested.posted_intr_nv = -1;
vmx->nested.current_vmptr = -1ull;

+ vmx->ept_pointer = INVALID_PAGE;
+
vmx->msr_ia32_feature_control_valid_bits = FEATURE_CONTROL_LOCKED;

/*
--
2.14.4
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