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-rw-r--r--arch/x86/include/uapi/asm/kvm.h33
-rw-r--r--arch/x86/kvm/mmu.c16
-rw-r--r--arch/x86/kvm/vmx/nested.c103
-rw-r--r--arch/x86/kvm/vmx/vmcs12.h5
-rw-r--r--arch/x86/net/bpf_jit_comp.c74
5 files changed, 114 insertions, 117 deletions
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index 7a0e64ccd6ff..d6ab5b4d15e5 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -383,6 +383,9 @@ struct kvm_sync_regs {
#define KVM_X86_QUIRK_LAPIC_MMIO_HOLE (1 << 2)
#define KVM_X86_QUIRK_OUT_7E_INC_RIP (1 << 3)
+#define KVM_STATE_NESTED_FORMAT_VMX 0
+#define KVM_STATE_NESTED_FORMAT_SVM 1 /* unused */
+
#define KVM_STATE_NESTED_GUEST_MODE 0x00000001
#define KVM_STATE_NESTED_RUN_PENDING 0x00000002
#define KVM_STATE_NESTED_EVMCS 0x00000004
@@ -390,9 +393,16 @@ struct kvm_sync_regs {
#define KVM_STATE_NESTED_SMM_GUEST_MODE 0x00000001
#define KVM_STATE_NESTED_SMM_VMXON 0x00000002
-struct kvm_vmx_nested_state {
+#define KVM_STATE_NESTED_VMX_VMCS_SIZE 0x1000
+
+struct kvm_vmx_nested_state_data {
+ __u8 vmcs12[KVM_STATE_NESTED_VMX_VMCS_SIZE];
+ __u8 shadow_vmcs12[KVM_STATE_NESTED_VMX_VMCS_SIZE];
+};
+
+struct kvm_vmx_nested_state_hdr {
__u64 vmxon_pa;
- __u64 vmcs_pa;
+ __u64 vmcs12_pa;
struct {
__u16 flags;
@@ -401,24 +411,25 @@ struct kvm_vmx_nested_state {
/* for KVM_CAP_NESTED_STATE */
struct kvm_nested_state {
- /* KVM_STATE_* flags */
__u16 flags;
-
- /* 0 for VMX, 1 for SVM. */
__u16 format;
-
- /* 128 for SVM, 128 + VMCS size for VMX. */
__u32 size;
union {
- /* VMXON, VMCS */
- struct kvm_vmx_nested_state vmx;
+ struct kvm_vmx_nested_state_hdr vmx;
/* Pad the header to 128 bytes. */
__u8 pad[120];
- };
+ } hdr;
- __u8 data[0];
+ /*
+ * Define data region as 0 bytes to preserve backwards-compatability
+ * to old definition of kvm_nested_state in order to avoid changing
+ * KVM_{GET,PUT}_NESTED_STATE ioctl values.
+ */
+ union {
+ struct kvm_vmx_nested_state_data vmx[0];
+ } data;
};
#endif /* _ASM_X86_KVM_H */
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index fd27ab5fde5b..98f6e4f88b04 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -5599,14 +5599,18 @@ static int alloc_mmu_pages(struct kvm_vcpu *vcpu)
struct page *page;
int i;
- if (tdp_enabled)
- return 0;
-
/*
- * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
- * Therefore we need to allocate shadow page tables in the first
- * 4GB of memory, which happens to fit the DMA32 zone.
+ * When using PAE paging, the four PDPTEs are treated as 'root' pages,
+ * while the PDP table is a per-vCPU construct that's allocated at MMU
+ * creation. When emulating 32-bit mode, cr3 is only 32 bits even on
+ * x86_64. Therefore we need to allocate the PDP table in the first
+ * 4GB of memory, which happens to fit the DMA32 zone. Except for
+ * SVM's 32-bit NPT support, TDP paging doesn't use PAE paging and can
+ * skip allocating the PDP table.
*/
+ if (tdp_enabled && kvm_x86_ops->get_tdp_level(vcpu) > PT32E_ROOT_LEVEL)
+ return 0;
+
page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_DMA32);
if (!page)
return -ENOMEM;
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 1032f068f0b9..5f9c1a200201 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -1397,7 +1397,7 @@ static int copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx)
}
if (unlikely(!(evmcs->hv_clean_fields &
- HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_PROC))) {
+ HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_EXCPN))) {
vmcs12->exception_bitmap = evmcs->exception_bitmap;
}
@@ -1437,7 +1437,7 @@ static int copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx)
}
if (unlikely(!(evmcs->hv_clean_fields &
- HV_VMX_ENLIGHTENED_CLEAN_FIELD_HOST_GRP1))) {
+ HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP1))) {
vmcs12->pin_based_vm_exec_control =
evmcs->pin_based_vm_exec_control;
vmcs12->vm_exit_controls = evmcs->vm_exit_controls;
@@ -5226,14 +5226,16 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12;
struct kvm_nested_state kvm_state = {
.flags = 0,
- .format = 0,
+ .format = KVM_STATE_NESTED_FORMAT_VMX,
.size = sizeof(kvm_state),
- .vmx.vmxon_pa = -1ull,
- .vmx.vmcs_pa = -1ull,
+ .hdr.vmx.vmxon_pa = -1ull,
+ .hdr.vmx.vmcs12_pa = -1ull,
};
+ struct kvm_vmx_nested_state_data __user *user_vmx_nested_state =
+ &user_kvm_nested_state->data.vmx[0];
if (!vcpu)
- return kvm_state.size + 2 * VMCS12_SIZE;
+ return kvm_state.size + sizeof(*user_vmx_nested_state);
vmx = to_vmx(vcpu);
vmcs12 = get_vmcs12(vcpu);
@@ -5243,23 +5245,23 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
if (nested_vmx_allowed(vcpu) &&
(vmx->nested.vmxon || vmx->nested.smm.vmxon)) {
- kvm_state.vmx.vmxon_pa = vmx->nested.vmxon_ptr;
- kvm_state.vmx.vmcs_pa = vmx->nested.current_vmptr;
+ kvm_state.hdr.vmx.vmxon_pa = vmx->nested.vmxon_ptr;
+ kvm_state.hdr.vmx.vmcs12_pa = vmx->nested.current_vmptr;
if (vmx_has_valid_vmcs12(vcpu)) {
- kvm_state.size += VMCS12_SIZE;
+ kvm_state.size += sizeof(user_vmx_nested_state->vmcs12);
if (is_guest_mode(vcpu) &&
nested_cpu_has_shadow_vmcs(vmcs12) &&
vmcs12->vmcs_link_pointer != -1ull)
- kvm_state.size += VMCS12_SIZE;
+ kvm_state.size += sizeof(user_vmx_nested_state->shadow_vmcs12);
}
if (vmx->nested.smm.vmxon)
- kvm_state.vmx.smm.flags |= KVM_STATE_NESTED_SMM_VMXON;
+ kvm_state.hdr.vmx.smm.flags |= KVM_STATE_NESTED_SMM_VMXON;
if (vmx->nested.smm.guest_mode)
- kvm_state.vmx.smm.flags |= KVM_STATE_NESTED_SMM_GUEST_MODE;
+ kvm_state.hdr.vmx.smm.flags |= KVM_STATE_NESTED_SMM_GUEST_MODE;
if (is_guest_mode(vcpu)) {
kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
@@ -5294,16 +5296,19 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
copy_shadow_to_vmcs12(vmx);
}
+ BUILD_BUG_ON(sizeof(user_vmx_nested_state->vmcs12) < VMCS12_SIZE);
+ BUILD_BUG_ON(sizeof(user_vmx_nested_state->shadow_vmcs12) < VMCS12_SIZE);
+
/*
* Copy over the full allocated size of vmcs12 rather than just the size
* of the struct.
*/
- if (copy_to_user(user_kvm_nested_state->data, vmcs12, VMCS12_SIZE))
+ if (copy_to_user(user_vmx_nested_state->vmcs12, vmcs12, VMCS12_SIZE))
return -EFAULT;
if (nested_cpu_has_shadow_vmcs(vmcs12) &&
vmcs12->vmcs_link_pointer != -1ull) {
- if (copy_to_user(user_kvm_nested_state->data + VMCS12_SIZE,
+ if (copy_to_user(user_vmx_nested_state->shadow_vmcs12,
get_shadow_vmcs12(vcpu), VMCS12_SIZE))
return -EFAULT;
}
@@ -5331,33 +5336,35 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
struct vcpu_vmx *vmx = to_vmx(vcpu);
struct vmcs12 *vmcs12;
u32 exit_qual;
+ struct kvm_vmx_nested_state_data __user *user_vmx_nested_state =
+ &user_kvm_nested_state->data.vmx[0];
int ret;
- if (kvm_state->format != 0)
+ if (kvm_state->format != KVM_STATE_NESTED_FORMAT_VMX)
return -EINVAL;
- if (!nested_vmx_allowed(vcpu))
- return kvm_state->vmx.vmxon_pa == -1ull ? 0 : -EINVAL;
-
- if (kvm_state->vmx.vmxon_pa == -1ull) {
- if (kvm_state->vmx.smm.flags)
+ if (kvm_state->hdr.vmx.vmxon_pa == -1ull) {
+ if (kvm_state->hdr.vmx.smm.flags)
return -EINVAL;
- if (kvm_state->vmx.vmcs_pa != -1ull)
+ if (kvm_state->hdr.vmx.vmcs12_pa != -1ull)
return -EINVAL;
- vmx_leave_nested(vcpu);
- return 0;
- }
+ if (kvm_state->flags & ~KVM_STATE_NESTED_EVMCS)
+ return -EINVAL;
+ } else {
+ if (!nested_vmx_allowed(vcpu))
+ return -EINVAL;
- if (!page_address_valid(vcpu, kvm_state->vmx.vmxon_pa))
- return -EINVAL;
+ if (!page_address_valid(vcpu, kvm_state->hdr.vmx.vmxon_pa))
+ return -EINVAL;
+ }
- if ((kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) &&
+ if ((kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) &&
(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
return -EINVAL;
- if (kvm_state->vmx.smm.flags &
+ if (kvm_state->hdr.vmx.smm.flags &
~(KVM_STATE_NESTED_SMM_GUEST_MODE | KVM_STATE_NESTED_SMM_VMXON))
return -EINVAL;
@@ -5366,21 +5373,25 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
* nor can VMLAUNCH/VMRESUME be pending. Outside SMM, SMM flags
* must be zero.
*/
- if (is_smm(vcpu) ? kvm_state->flags : kvm_state->vmx.smm.flags)
+ if (is_smm(vcpu) ? kvm_state->flags : kvm_state->hdr.vmx.smm.flags)
return -EINVAL;
- if ((kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) &&
- !(kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON))
+ if ((kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) &&
+ !(kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON))
return -EINVAL;
vmx_leave_nested(vcpu);
- if (kvm_state->vmx.vmxon_pa == -1ull)
- return 0;
+ if (kvm_state->flags & KVM_STATE_NESTED_EVMCS) {
+ if (!nested_vmx_allowed(vcpu))
+ return -EINVAL;
- if (kvm_state->flags & KVM_STATE_NESTED_EVMCS)
nested_enable_evmcs(vcpu, NULL);
+ }
+
+ if (kvm_state->hdr.vmx.vmxon_pa == -1ull)
+ return 0;
- vmx->nested.vmxon_ptr = kvm_state->vmx.vmxon_pa;
+ vmx->nested.vmxon_ptr = kvm_state->hdr.vmx.vmxon_pa;
ret = enter_vmx_operation(vcpu);
if (ret)
return ret;
@@ -5389,12 +5400,12 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
if (kvm_state->size < sizeof(*kvm_state) + sizeof(*vmcs12))
return 0;
- if (kvm_state->vmx.vmcs_pa != -1ull) {
- if (kvm_state->vmx.vmcs_pa == kvm_state->vmx.vmxon_pa ||
- !page_address_valid(vcpu, kvm_state->vmx.vmcs_pa))
+ if (kvm_state->hdr.vmx.vmcs12_pa != -1ull) {
+ if (kvm_state->hdr.vmx.vmcs12_pa == kvm_state->hdr.vmx.vmxon_pa ||
+ !page_address_valid(vcpu, kvm_state->hdr.vmx.vmcs12_pa))
return -EINVAL;
- set_current_vmptr(vmx, kvm_state->vmx.vmcs_pa);
+ set_current_vmptr(vmx, kvm_state->hdr.vmx.vmcs12_pa);
} else if (kvm_state->flags & KVM_STATE_NESTED_EVMCS) {
/*
* Sync eVMCS upon entry as we may not have
@@ -5405,16 +5416,16 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
return -EINVAL;
}
- if (kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON) {
+ if (kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON) {
vmx->nested.smm.vmxon = true;
vmx->nested.vmxon = false;
- if (kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE)
+ if (kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE)
vmx->nested.smm.guest_mode = true;
}
vmcs12 = get_vmcs12(vcpu);
- if (copy_from_user(vmcs12, user_kvm_nested_state->data, sizeof(*vmcs12)))
+ if (copy_from_user(vmcs12, user_vmx_nested_state->vmcs12, sizeof(*vmcs12)))
return -EFAULT;
if (vmcs12->hdr.revision_id != VMCS12_REVISION)
@@ -5431,12 +5442,14 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
vmcs12->vmcs_link_pointer != -1ull) {
struct vmcs12 *shadow_vmcs12 = get_shadow_vmcs12(vcpu);
- if (kvm_state->size < sizeof(*kvm_state) + VMCS12_SIZE + sizeof(*vmcs12))
+ if (kvm_state->size <
+ sizeof(*kvm_state) +
+ sizeof(user_vmx_nested_state->vmcs12) + sizeof(*shadow_vmcs12))
goto error_guest_mode;
if (copy_from_user(shadow_vmcs12,
- user_kvm_nested_state->data + VMCS12_SIZE,
- sizeof(*vmcs12))) {
+ user_vmx_nested_state->shadow_vmcs12,
+ sizeof(*shadow_vmcs12))) {
ret = -EFAULT;
goto error_guest_mode;
}
diff --git a/arch/x86/kvm/vmx/vmcs12.h b/arch/x86/kvm/vmx/vmcs12.h
index 3a742428ad17..337718fc8a36 100644
--- a/arch/x86/kvm/vmx/vmcs12.h
+++ b/arch/x86/kvm/vmx/vmcs12.h
@@ -201,9 +201,10 @@ struct __packed vmcs12 {
/*
* VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region
* and any VMCS region. Although only sizeof(struct vmcs12) are used by the
- * current implementation, 4K are reserved to avoid future complications.
+ * current implementation, 4K are reserved to avoid future complications and
+ * to preserve userspace ABI.
*/
-#define VMCS12_SIZE 0x1000
+#define VMCS12_SIZE KVM_STATE_NESTED_VMX_VMCS_SIZE
/*
* VMCS12_MAX_FIELD_INDEX is the highest index value used in any
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 32bfab4e21eb..eaaed5bfc4a4 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -186,9 +186,7 @@ struct jit_context {
#define BPF_MAX_INSN_SIZE 128
#define BPF_INSN_SAFETY 64
-#define AUX_STACK_SPACE 40 /* Space for RBX, R13, R14, R15, tailcnt */
-
-#define PROLOGUE_SIZE 37
+#define PROLOGUE_SIZE 20
/*
* Emit x86-64 prologue code for BPF program and check its size.
@@ -199,44 +197,19 @@ static void emit_prologue(u8 **pprog, u32 stack_depth, bool ebpf_from_cbpf)
u8 *prog = *pprog;
int cnt = 0;
- /* push rbp */
- EMIT1(0x55);
-
- /* mov rbp,rsp */
- EMIT3(0x48, 0x89, 0xE5);
-
- /* sub rsp, rounded_stack_depth + AUX_STACK_SPACE */
- EMIT3_off32(0x48, 0x81, 0xEC,
- round_up(stack_depth, 8) + AUX_STACK_SPACE);
-
- /* sub rbp, AUX_STACK_SPACE */
- EMIT4(0x48, 0x83, 0xED, AUX_STACK_SPACE);
-
- /* mov qword ptr [rbp+0],rbx */
- EMIT4(0x48, 0x89, 0x5D, 0);
- /* mov qword ptr [rbp+8],r13 */
- EMIT4(0x4C, 0x89, 0x6D, 8);
- /* mov qword ptr [rbp+16],r14 */
- EMIT4(0x4C, 0x89, 0x75, 16);
- /* mov qword ptr [rbp+24],r15 */
- EMIT4(0x4C, 0x89, 0x7D, 24);
-
+ EMIT1(0x55); /* push rbp */
+ EMIT3(0x48, 0x89, 0xE5); /* mov rbp, rsp */
+ /* sub rsp, rounded_stack_depth */
+ EMIT3_off32(0x48, 0x81, 0xEC, round_up(stack_depth, 8));
+ EMIT1(0x53); /* push rbx */
+ EMIT2(0x41, 0x55); /* push r13 */
+ EMIT2(0x41, 0x56); /* push r14 */
+ EMIT2(0x41, 0x57); /* push r15 */
if (!ebpf_from_cbpf) {
- /*
- * Clear the tail call counter (tail_call_cnt): for eBPF tail
- * calls we need to reset the counter to 0. It's done in two
- * instructions, resetting RAX register to 0, and moving it
- * to the counter location.
- */
-
- /* xor eax, eax */
- EMIT2(0x31, 0xc0);
- /* mov qword ptr [rbp+32], rax */
- EMIT4(0x48, 0x89, 0x45, 32);
-
+ /* zero init tail_call_cnt */
+ EMIT2(0x6a, 0x00);
BUILD_BUG_ON(cnt != PROLOGUE_SIZE);
}
-
*pprog = prog;
}
@@ -281,13 +254,13 @@ static void emit_bpf_tail_call(u8 **pprog)
* if (tail_call_cnt > MAX_TAIL_CALL_CNT)
* goto out;
*/
- EMIT2_off32(0x8B, 0x85, 36); /* mov eax, dword ptr [rbp + 36] */
+ EMIT2_off32(0x8B, 0x85, -36 - MAX_BPF_STACK); /* mov eax, dword ptr [rbp - 548] */
EMIT3(0x83, 0xF8, MAX_TAIL_CALL_CNT); /* cmp eax, MAX_TAIL_CALL_CNT */
#define OFFSET2 (30 + RETPOLINE_RAX_BPF_JIT_SIZE)
EMIT2(X86_JA, OFFSET2); /* ja out */
label2 = cnt;
EMIT3(0x83, 0xC0, 0x01); /* add eax, 1 */
- EMIT2_off32(0x89, 0x85, 36); /* mov dword ptr [rbp + 36], eax */
+ EMIT2_off32(0x89, 0x85, -36 - MAX_BPF_STACK); /* mov dword ptr [rbp -548], eax */
/* prog = array->ptrs[index]; */
EMIT4_off32(0x48, 0x8B, 0x84, 0xD6, /* mov rax, [rsi + rdx * 8 + offsetof(...)] */
@@ -1036,19 +1009,14 @@ emit_jmp:
seen_exit = true;
/* Update cleanup_addr */
ctx->cleanup_addr = proglen;
- /* mov rbx, qword ptr [rbp+0] */
- EMIT4(0x48, 0x8B, 0x5D, 0);
- /* mov r13, qword ptr [rbp+8] */
- EMIT4(0x4C, 0x8B, 0x6D, 8);
- /* mov r14, qword ptr [rbp+16] */
- EMIT4(0x4C, 0x8B, 0x75, 16);
- /* mov r15, qword ptr [rbp+24] */
- EMIT4(0x4C, 0x8B, 0x7D, 24);
-
- /* add rbp, AUX_STACK_SPACE */
- EMIT4(0x48, 0x83, 0xC5, AUX_STACK_SPACE);
- EMIT1(0xC9); /* leave */
- EMIT1(0xC3); /* ret */
+ if (!bpf_prog_was_classic(bpf_prog))
+ EMIT1(0x5B); /* get rid of tail_call_cnt */
+ EMIT2(0x41, 0x5F); /* pop r15 */
+ EMIT2(0x41, 0x5E); /* pop r14 */
+ EMIT2(0x41, 0x5D); /* pop r13 */
+ EMIT1(0x5B); /* pop rbx */
+ EMIT1(0xC9); /* leave */
+ EMIT1(0xC3); /* ret */
break;
default:
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-31 04:02:19 +0000