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Subject[RESEND PATCH v10 06/10] vmx: spp: Set up SPP paging table at vmentry/vmexit
Date
If write to subpage is not allowed, EPT violation generates
and it's handled in fast_page_fault().

In current implementation, SPPT setup is only handled in handle_spp()
vmexit handler, it's triggered when SPP bit is set in EPT leaf
entry while SPPT entries are not ready.

A SPP specific bit(11) is added to exit_qualification and a new
exit reason(66) is introduced for SPP.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Co-developed-by: He Chen <he.chen@linux.intel.com>
Signed-off-by: He Chen <he.chen@linux.intel.com>
Co-developed-by: Zhang Yi <yi.z.zhang@linux.intel.com>
Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
arch/x86/include/asm/vmx.h | 9 ++++
arch/x86/include/uapi/asm/vmx.h | 2 +
arch/x86/kvm/mmu/mmu.c | 69 +++++++++++++++++++++++++---
arch/x86/kvm/mmu/spp.c | 13 ++++++
arch/x86/kvm/mmu/spp.h | 2 +
arch/x86/kvm/trace.h | 66 +++++++++++++++++++++++++++
arch/x86/kvm/vmx/vmx.c | 80 ++++++++++++++++++++++++++++++++-
arch/x86/kvm/x86.c | 4 ++
include/uapi/linux/kvm.h | 6 +++
9 files changed, 244 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index de79a4de0723..81faf6607a9e 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -213,6 +213,8 @@ enum vmcs_field {
XSS_EXIT_BITMAP_HIGH = 0x0000202D,
ENCLS_EXITING_BITMAP = 0x0000202E,
ENCLS_EXITING_BITMAP_HIGH = 0x0000202F,
+ SPPT_POINTER = 0x00002030,
+ SPPT_POINTER_HIGH = 0x00002031,
TSC_MULTIPLIER = 0x00002032,
TSC_MULTIPLIER_HIGH = 0x00002033,
GUEST_PHYSICAL_ADDRESS = 0x00002400,
@@ -534,6 +536,13 @@ struct vmx_msr_entry {
#define EPT_VIOLATION_EXECUTABLE (1 << EPT_VIOLATION_EXECUTABLE_BIT)
#define EPT_VIOLATION_GVA_TRANSLATED (1 << EPT_VIOLATION_GVA_TRANSLATED_BIT)

+/*
+ * Exit Qualifications for SPPT-Induced vmexits
+ */
+#define SPPT_INDUCED_EXIT_TYPE_BIT 11
+#define SPPT_INDUCED_EXIT_TYPE (1 << SPPT_INDUCED_EXIT_TYPE_BIT)
+#define SPPT_INTR_INFO_UNBLOCK_NMI INTR_INFO_UNBLOCK_NMI
+
/*
* VM-instruction error numbers
*/
diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h
index 3eb8411ab60e..4833a39a799b 100644
--- a/arch/x86/include/uapi/asm/vmx.h
+++ b/arch/x86/include/uapi/asm/vmx.h
@@ -86,6 +86,7 @@
#define EXIT_REASON_PML_FULL 62
#define EXIT_REASON_XSAVES 63
#define EXIT_REASON_XRSTORS 64
+#define EXIT_REASON_SPP 66
#define EXIT_REASON_UMWAIT 67
#define EXIT_REASON_TPAUSE 68

@@ -145,6 +146,7 @@
{ EXIT_REASON_ENCLS, "ENCLS" }, \
{ EXIT_REASON_RDSEED, "RDSEED" }, \
{ EXIT_REASON_PML_FULL, "PML_FULL" }, \
+ { EXIT_REASON_SPP, "SPP" }, \
{ EXIT_REASON_XSAVES, "XSAVES" }, \
{ EXIT_REASON_XRSTORS, "XRSTORS" }, \
{ EXIT_REASON_UMWAIT, "UMWAIT" }, \
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 6f92b40d798c..c41791ebee65 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -20,6 +20,7 @@
#include "x86.h"
#include "kvm_cache_regs.h"
#include "cpuid.h"
+#include "spp.h"

#include <linux/kvm_host.h>
#include <linux/types.h>
@@ -177,6 +178,7 @@ module_param(dbg, bool, 0644);
/* The mask for the R/X bits in EPT PTEs */
#define PT64_EPT_READABLE_MASK 0x1ull
#define PT64_EPT_EXECUTABLE_MASK 0x4ull
+#define PT64_SPP_SAVED_BIT (1ULL << (PT64_SECOND_AVAIL_BITS_SHIFT + 1))

#include <trace/events/kvm.h>

@@ -200,6 +202,7 @@ enum {
RET_PF_RETRY = 0,
RET_PF_EMULATE = 1,
RET_PF_INVALID = 2,
+ RET_PF_USERSPACE = 3,
};

struct pte_list_desc {
@@ -979,6 +982,11 @@ static u64 mark_spte_for_access_track(u64 spte)
shadow_acc_track_saved_bits_shift;
spte &= ~shadow_acc_track_mask;

+ if (spte & PT_SPP_MASK) {
+ spte &= ~PT_SPP_MASK;
+ spte |= PT64_SPP_SAVED_BIT;
+ }
+
return spte;
}

@@ -1677,9 +1685,15 @@ static bool spte_wrprot_for_clear_dirty(u64 *sptep)
{
bool was_writable = test_and_clear_bit(PT_WRITABLE_SHIFT,
(unsigned long *)sptep);
+ bool was_spp_armed = test_and_clear_bit(PT_SPP_SHIFT,
+ (unsigned long *)sptep);
+
if (was_writable && !spte_ad_enabled(*sptep))
kvm_set_pfn_dirty(spte_to_pfn(*sptep));

+ if (was_spp_armed)
+ *sptep |= PT64_SPP_SAVED_BIT;
+
return was_writable;
}

@@ -3478,7 +3492,8 @@ static bool page_fault_can_be_fast(u32 error_code)
*/
static bool
fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
- u64 *sptep, u64 old_spte, u64 new_spte)
+ u64 *sptep, u64 old_spte, u64 new_spte,
+ bool spp_protected)
{
gfn_t gfn;

@@ -3499,7 +3514,8 @@ fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
if (cmpxchg64(sptep, old_spte, new_spte) != old_spte)
return false;

- if (is_writable_pte(new_spte) && !is_writable_pte(old_spte)) {
+ if ((is_writable_pte(new_spte) && !is_writable_pte(old_spte)) ||
+ spp_protected) {
/*
* The gfn of direct spte is stable since it is
* calculated by sp->gfn.
@@ -3534,6 +3550,7 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level,
struct kvm_shadow_walk_iterator iterator;
struct kvm_mmu_page *sp;
bool fault_handled = false;
+ bool spp_protected = false;
u64 spte = 0ull;
uint retry_count = 0;

@@ -3585,7 +3602,30 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level,
if ((error_code & PFERR_WRITE_MASK) &&
spte_can_locklessly_be_made_writable(spte))
{
- new_spte |= PT_WRITABLE_MASK;
+ /*
+ * Record write protect fault caused by
+ * Sub-page Protection, let VMI decide
+ * the next step.
+ */
+ if (spte & PT_SPP_MASK) {
+ int len = kvm_x86_ops->get_inst_len(vcpu);
+
+ fault_handled = true;
+ vcpu->run->exit_reason = KVM_EXIT_SPP;
+ vcpu->run->spp.addr = gva;
+ vcpu->run->spp.ins_len = len;
+ trace_kvm_spp_induced_page_fault(vcpu,
+ gva,
+ len);
+ break;
+ }
+
+ if (was_spp_armed(new_spte)) {
+ restore_spp_bit(&new_spte);
+ spp_protected = true;
+ } else {
+ new_spte |= PT_WRITABLE_MASK;
+ }

/*
* Do not fix write-permission on the large spte. Since
@@ -3604,7 +3644,8 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level,

/* Verify that the fault can be handled in the fast path */
if (new_spte == spte ||
- !is_access_allowed(error_code, new_spte))
+ (!is_access_allowed(error_code, new_spte) &&
+ !spp_protected))
break;

/*
@@ -3614,7 +3655,8 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level,
*/
fault_handled = fast_pf_fix_direct_spte(vcpu, sp,
iterator.sptep, spte,
- new_spte);
+ new_spte,
+ spp_protected);
if (fault_handled)
break;

@@ -3740,6 +3782,12 @@ void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
(mmu->root_level >= PT64_ROOT_4LEVEL || mmu->direct_map)) {
mmu_free_root_page(vcpu->kvm, &mmu->root_hpa,
&invalid_list);
+ if (vcpu->kvm->arch.spp_active) {
+ vcpu->kvm->arch.spp_active = false;
+ mmu_free_root_page(vcpu->kvm,
+ &vcpu->kvm->arch.sppt_root,
+ &invalid_list);
+ }
} else {
for (i = 0; i < 4; ++i)
if (mmu->pae_root[i] != 0)
@@ -5223,6 +5271,8 @@ void kvm_init_mmu(struct kvm_vcpu *vcpu, bool reset_roots)
uint i;

vcpu->arch.mmu->root_hpa = INVALID_PAGE;
+ if (!vcpu->kvm->arch.spp_active)
+ vcpu->kvm->arch.sppt_root = INVALID_PAGE;

for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
vcpu->arch.mmu->prev_roots[i] = KVM_MMU_ROOT_INFO_INVALID;
@@ -5539,6 +5589,10 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u64 error_code,
r = vcpu->arch.mmu->page_fault(vcpu, cr2,
lower_32_bits(error_code),
false);
+
+ if (vcpu->run->exit_reason == KVM_EXIT_SPP)
+ r = RET_PF_USERSPACE;
+
WARN_ON(r == RET_PF_INVALID);
}

@@ -5546,7 +5600,8 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u64 error_code,
return 1;
if (r < 0)
return r;
-
+ if (r == RET_PF_USERSPACE)
+ return 0;
/*
* Before emulating the instruction, check if the error code
* was due to a RO violation while translating the guest page.
@@ -6372,6 +6427,8 @@ unsigned long kvm_mmu_calculate_default_mmu_pages(struct kvm *kvm)
return nr_mmu_pages;
}

+#include "spp.c"
+
void kvm_mmu_destroy(struct kvm_vcpu *vcpu)
{
kvm_mmu_unload(vcpu);
diff --git a/arch/x86/kvm/mmu/spp.c b/arch/x86/kvm/mmu/spp.c
index 6f611e04e817..3ec434140967 100644
--- a/arch/x86/kvm/mmu/spp.c
+++ b/arch/x86/kvm/mmu/spp.c
@@ -17,6 +17,18 @@ static void shadow_spp_walk_init(struct kvm_shadow_walk_iterator *iterator,
iterator->level = PT64_ROOT_4LEVEL;
}

+/* Restore an spp armed PTE */
+void restore_spp_bit(u64 *spte)
+{
+ *spte &= ~PT64_SPP_SAVED_BIT;
+ *spte |= PT_SPP_MASK;
+}
+
+bool was_spp_armed(u64 spte)
+{
+ return !!(spte & PT64_SPP_SAVED_BIT);
+}
+
u32 *gfn_to_subpage_wp_info(struct kvm_memory_slot *slot, gfn_t gfn)
{
unsigned long idx;
@@ -459,6 +471,7 @@ int kvm_spp_set_permission(struct kvm *kvm, u64 gfn, u32 npages,
if (!access)
return -EFAULT;
*access = access_map[i];
+ trace_kvm_spp_set_subpages(vcpu, gfn, *access);
}

gfn = old_gfn;
diff --git a/arch/x86/kvm/mmu/spp.h b/arch/x86/kvm/mmu/spp.h
index daa69bd274da..5ffe06d2cd6f 100644
--- a/arch/x86/kvm/mmu/spp.h
+++ b/arch/x86/kvm/mmu/spp.h
@@ -11,6 +11,8 @@ int kvm_spp_set_permission(struct kvm *kvm, u64 gfn, u32 npages,
u32 *access_map);
int kvm_spp_mark_protection(struct kvm *kvm, u64 gfn, u32 access);
bool is_spp_spte(struct kvm_mmu_page *sp);
+void restore_spp_bit(u64 *spte);
+bool was_spp_armed(u64 spte);
u64 construct_spptp(unsigned long root_hpa);
int kvm_vm_ioctl_get_subpages(struct kvm *kvm,
u64 gfn,
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 7c741a0c5f80..293b91d516b1 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1496,6 +1496,72 @@ TRACE_EVENT(kvm_nested_vmenter_failed,
__print_symbolic(__entry->err, VMX_VMENTER_INSTRUCTION_ERRORS))
);

+TRACE_EVENT(kvm_spp_set_subpages,
+ TP_PROTO(struct kvm_vcpu *vcpu, gfn_t gfn, u32 access),
+ TP_ARGS(vcpu, gfn, access),
+
+ TP_STRUCT__entry(
+ __field(int, vcpu_id)
+ __field(gfn_t, gfn)
+ __field(u32, access)
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu_id = vcpu->vcpu_id;
+ __entry->gfn = gfn;
+ __entry->access = access;
+ ),
+
+ TP_printk("vcpu %d gfn %llx access %x",
+ __entry->vcpu_id,
+ __entry->gfn,
+ __entry->access)
+);
+
+TRACE_EVENT(kvm_spp_induced_exit,
+ TP_PROTO(struct kvm_vcpu *vcpu, gpa_t gpa, u32 qualification),
+ TP_ARGS(vcpu, gpa, qualification),
+
+ TP_STRUCT__entry(
+ __field(int, vcpu_id)
+ __field(gpa_t, gpa)
+ __field(u32, qualification)
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu_id = vcpu->vcpu_id;
+ __entry->gpa = gpa;
+ __entry->qualification = qualification;
+ ),
+
+ TP_printk("vcpu %d gpa %llx qualificaiton %x",
+ __entry->vcpu_id,
+ __entry->gpa,
+ __entry->qualification)
+);
+
+TRACE_EVENT(kvm_spp_induced_page_fault,
+ TP_PROTO(struct kvm_vcpu *vcpu, gpa_t gpa, int inst_len),
+ TP_ARGS(vcpu, gpa, inst_len),
+
+ TP_STRUCT__entry(
+ __field(int, vcpu_id)
+ __field(gpa_t, gpa)
+ __field(int, inst_len)
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu_id = vcpu->vcpu_id;
+ __entry->gpa = gpa;
+ __entry->inst_len = inst_len;
+ ),
+
+ TP_printk("vcpu %d gpa %llx inst_len %d",
+ __entry->vcpu_id,
+ __entry->gpa,
+ __entry->inst_len)
+);
+
#endif /* _TRACE_KVM_H */

#undef TRACE_INCLUDE_PATH
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 24e4e1c47f42..97d862c79124 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -200,7 +200,6 @@ static const struct {
[VMENTER_L1D_FLUSH_EPT_DISABLED] = {"EPT disabled", false},
[VMENTER_L1D_FLUSH_NOT_REQUIRED] = {"not required", false},
};
-
#define L1D_CACHE_ORDER 4
static void *vmx_l1d_flush_pages;

@@ -2999,6 +2998,7 @@ void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
bool update_guest_cr3 = true;
unsigned long guest_cr3;
u64 eptp;
+ u64 spptp;

guest_cr3 = cr3;
if (enable_ept) {
@@ -3027,6 +3027,12 @@ void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)

if (update_guest_cr3)
vmcs_writel(GUEST_CR3, guest_cr3);
+
+ if (kvm->arch.spp_active && VALID_PAGE(vcpu->kvm->arch.sppt_root)) {
+ spptp = construct_spptp(vcpu->kvm->arch.sppt_root);
+ vmcs_write64(SPPT_POINTER, spptp);
+ vmx_flush_tlb(vcpu, true);
+ }
}

int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
@@ -5361,6 +5367,74 @@ static int handle_monitor_trap(struct kvm_vcpu *vcpu)
return 1;
}

+int handle_spp(struct kvm_vcpu *vcpu)
+{
+ unsigned long exit_qualification;
+ struct kvm_memory_slot *slot;
+ gpa_t gpa;
+ gfn_t gfn;
+
+ exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+
+ /*
+ * SPP VM exit happened while executing iret from NMI,
+ * "blocked by NMI" bit has to be set before next VM entry.
+ * There are errata that may cause this bit to not be set:
+ * AAK134, BY25.
+ */
+ if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
+ (exit_qualification & SPPT_INTR_INFO_UNBLOCK_NMI))
+ vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
+ GUEST_INTR_STATE_NMI);
+
+ vcpu->arch.exit_qualification = exit_qualification;
+ if (exit_qualification & SPPT_INDUCED_EXIT_TYPE) {
+ int page_num = KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL);
+ u32 *access;
+ gfn_t gfn_max;
+
+ /*
+ * SPPT missing
+ * We don't set SPP write access for the corresponding
+ * GPA, if we haven't setup, we need to construct
+ * SPP table here.
+ */
+ gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
+ gfn = gpa >> PAGE_SHIFT;
+ trace_kvm_spp_induced_exit(vcpu, gpa, exit_qualification);
+ /*
+ * In level 1 of SPPT, there's no PRESENT bit, all data is
+ * regarded as permission vector, so need to check from
+ * level 2 to set up the vector if target page is protected.
+ */
+ spin_lock(&vcpu->kvm->mmu_lock);
+ gfn &= ~(page_num - 1);
+ gfn_max = gfn + page_num - 1;
+ for (; gfn <= gfn_max; gfn++) {
+ slot = gfn_to_memslot(vcpu->kvm, gfn);
+ if (!slot)
+ continue;
+ access = gfn_to_subpage_wp_info(slot, gfn);
+ if (access && *access != FULL_SPP_ACCESS)
+ kvm_spp_setup_structure(vcpu,
+ *access,
+ gfn);
+ }
+ spin_unlock(&vcpu->kvm->mmu_lock);
+ return 1;
+ }
+ /*
+ * SPPT Misconfig
+ * This is probably caused by some mis-configuration in SPPT
+ * entries, cannot handle it here, escalate the fault to
+ * emulator.
+ */
+ WARN_ON(1);
+ vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
+ vcpu->run->hw.hardware_exit_reason = EXIT_REASON_SPP;
+ return 0;
+}
+
static int handle_monitor(struct kvm_vcpu *vcpu)
{
printk_once(KERN_WARNING "kvm: MONITOR instruction emulated as NOP!\n");
@@ -5575,6 +5649,7 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
[EXIT_REASON_INVVPID] = handle_vmx_instruction,
[EXIT_REASON_RDRAND] = handle_invalid_op,
[EXIT_REASON_RDSEED] = handle_invalid_op,
+ [EXIT_REASON_SPP] = handle_spp,
[EXIT_REASON_PML_FULL] = handle_pml_full,
[EXIT_REASON_INVPCID] = handle_invpcid,
[EXIT_REASON_VMFUNC] = handle_vmx_instruction,
@@ -5807,6 +5882,9 @@ void dump_vmcs(void)
pr_err("PostedIntrVec = 0x%02x\n", vmcs_read16(POSTED_INTR_NV));
if ((secondary_exec_control & SECONDARY_EXEC_ENABLE_EPT))
pr_err("EPT pointer = 0x%016llx\n", vmcs_read64(EPT_POINTER));
+ if ((secondary_exec_control & SECONDARY_EXEC_ENABLE_SPP))
+ pr_err("SPPT pointer = 0x%016llx\n", vmcs_read64(SPPT_POINTER));
+
n = vmcs_read32(CR3_TARGET_COUNT);
for (i = 0; i + 1 < n; i += 4)
pr_err("CR3 target%u=%016lx target%u=%016lx\n",
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fb7da000ceaf..a9d7fc21dad6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9782,6 +9782,7 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
}

kvm_page_track_free_memslot(free, dont);
+ kvm_spp_free_memslot(free, dont);
}

int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
@@ -10406,3 +10407,6 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_spp_set_subpages);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_spp_induced_exit);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_spp_induced_page_fault);
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 09e5e8e6e6dd..c0f3162ee46a 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -244,6 +244,7 @@ struct kvm_hyperv_exit {
#define KVM_EXIT_IOAPIC_EOI 26
#define KVM_EXIT_HYPERV 27
#define KVM_EXIT_ARM_NISV 28
+#define KVM_EXIT_SPP 29

/* For KVM_EXIT_INTERNAL_ERROR */
/* Emulate instruction failed. */
@@ -401,6 +402,11 @@ struct kvm_run {
struct {
__u8 vector;
} eoi;
+ /* KVM_EXIT_SPP */
+ struct {
+ __u64 addr;
+ __u8 ins_len;
+ } spp;
/* KVM_EXIT_HYPERV */
struct kvm_hyperv_exit hyperv;
/* KVM_EXIT_ARM_NISV */
--
2.17.2
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