Message-Id: <20221027164944.3031588-3-pbonzini@redhat.com>
Date:   Thu, 27 Oct 2022 12:49:36 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     mlevitsk@...hat.com, seanjc@...gle.com
Subject: [PATCH 02/10] KVM: x86: move SMM entry to a new file

Some users of KVM implement the UEFI variable store through a paravirtual
device that does not require the "SMM lockbox" component of edk2, and
would like to compile out system management mode.  In preparation for
that, move the SMM entry code out of x86.c and into a new file.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
Message-Id: <20220929172016.319443-3-pbonzini@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/include/asm/kvm_host.h |   1 +
 arch/x86/kvm/smm.c              | 235 +++++++++++++++++++++++++++++++
 arch/x86/kvm/smm.h              |   1 +
 arch/x86/kvm/x86.c              | 239 +-------------------------------
 4 files changed, 239 insertions(+), 237 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d489548bf247..38451bf71b80 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1839,6 +1839,7 @@ int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu);
 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu);
 
 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
+void kvm_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);
 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector);
 
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index b91c48d91f6e..26a6859e421f 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -5,6 +5,7 @@
 #include "kvm_cache_regs.h"
 #include "kvm_emulate.h"
 #include "smm.h"
+#include "cpuid.h"
 #include "trace.h"
 
 void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm)
@@ -35,3 +36,237 @@ void process_smi(struct kvm_vcpu *vcpu)
 	vcpu->arch.smi_pending = true;
 	kvm_make_request(KVM_REQ_EVENT, vcpu);
 }
+
+static u32 enter_smm_get_segment_flags(struct kvm_segment *seg)
+{
+	u32 flags = 0;
+	flags |= seg->g       << 23;
+	flags |= seg->db      << 22;
+	flags |= seg->l       << 21;
+	flags |= seg->avl     << 20;
+	flags |= seg->present << 15;
+	flags |= seg->dpl     << 13;
+	flags |= seg->s       << 12;
+	flags |= seg->type    << 8;
+	return flags;
+}
+
+static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n)
+{
+	struct kvm_segment seg;
+	int offset;
+
+	kvm_get_segment(vcpu, &seg, n);
+	PUT_SMSTATE(u32, buf, 0x7fa8 + n * 4, seg.selector);
+
+	if (n < 3)
+		offset = 0x7f84 + n * 12;
+	else
+		offset = 0x7f2c + (n - 3) * 12;
+
+	PUT_SMSTATE(u32, buf, offset + 8, seg.base);
+	PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
+	PUT_SMSTATE(u32, buf, offset, enter_smm_get_segment_flags(&seg));
+}
+
+#ifdef CONFIG_X86_64
+static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n)
+{
+	struct kvm_segment seg;
+	int offset;
+	u16 flags;
+
+	kvm_get_segment(vcpu, &seg, n);
+	offset = 0x7e00 + n * 16;
+
+	flags = enter_smm_get_segment_flags(&seg) >> 8;
+	PUT_SMSTATE(u16, buf, offset, seg.selector);
+	PUT_SMSTATE(u16, buf, offset + 2, flags);
+	PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
+	PUT_SMSTATE(u64, buf, offset + 8, seg.base);
+}
+#endif
+
+static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf)
+{
+	struct desc_ptr dt;
+	struct kvm_segment seg;
+	unsigned long val;
+	int i;
+
+	PUT_SMSTATE(u32, buf, 0x7ffc, kvm_read_cr0(vcpu));
+	PUT_SMSTATE(u32, buf, 0x7ff8, kvm_read_cr3(vcpu));
+	PUT_SMSTATE(u32, buf, 0x7ff4, kvm_get_rflags(vcpu));
+	PUT_SMSTATE(u32, buf, 0x7ff0, kvm_rip_read(vcpu));
+
+	for (i = 0; i < 8; i++)
+		PUT_SMSTATE(u32, buf, 0x7fd0 + i * 4, kvm_register_read_raw(vcpu, i));
+
+	kvm_get_dr(vcpu, 6, &val);
+	PUT_SMSTATE(u32, buf, 0x7fcc, (u32)val);
+	kvm_get_dr(vcpu, 7, &val);
+	PUT_SMSTATE(u32, buf, 0x7fc8, (u32)val);
+
+	kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
+	PUT_SMSTATE(u32, buf, 0x7fc4, seg.selector);
+	PUT_SMSTATE(u32, buf, 0x7f64, seg.base);
+	PUT_SMSTATE(u32, buf, 0x7f60, seg.limit);
+	PUT_SMSTATE(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg));
+
+	kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
+	PUT_SMSTATE(u32, buf, 0x7fc0, seg.selector);
+	PUT_SMSTATE(u32, buf, 0x7f80, seg.base);
+	PUT_SMSTATE(u32, buf, 0x7f7c, seg.limit);
+	PUT_SMSTATE(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg));
+
+	static_call(kvm_x86_get_gdt)(vcpu, &dt);
+	PUT_SMSTATE(u32, buf, 0x7f74, dt.address);
+	PUT_SMSTATE(u32, buf, 0x7f70, dt.size);
+
+	static_call(kvm_x86_get_idt)(vcpu, &dt);
+	PUT_SMSTATE(u32, buf, 0x7f58, dt.address);
+	PUT_SMSTATE(u32, buf, 0x7f54, dt.size);
+
+	for (i = 0; i < 6; i++)
+		enter_smm_save_seg_32(vcpu, buf, i);
+
+	PUT_SMSTATE(u32, buf, 0x7f14, kvm_read_cr4(vcpu));
+
+	/* revision id */
+	PUT_SMSTATE(u32, buf, 0x7efc, 0x00020000);
+	PUT_SMSTATE(u32, buf, 0x7ef8, vcpu->arch.smbase);
+}
+
+#ifdef CONFIG_X86_64
+static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf)
+{
+	struct desc_ptr dt;
+	struct kvm_segment seg;
+	unsigned long val;
+	int i;
+
+	for (i = 0; i < 16; i++)
+		PUT_SMSTATE(u64, buf, 0x7ff8 - i * 8, kvm_register_read_raw(vcpu, i));
+
+	PUT_SMSTATE(u64, buf, 0x7f78, kvm_rip_read(vcpu));
+	PUT_SMSTATE(u32, buf, 0x7f70, kvm_get_rflags(vcpu));
+
+	kvm_get_dr(vcpu, 6, &val);
+	PUT_SMSTATE(u64, buf, 0x7f68, val);
+	kvm_get_dr(vcpu, 7, &val);
+	PUT_SMSTATE(u64, buf, 0x7f60, val);
+
+	PUT_SMSTATE(u64, buf, 0x7f58, kvm_read_cr0(vcpu));
+	PUT_SMSTATE(u64, buf, 0x7f50, kvm_read_cr3(vcpu));
+	PUT_SMSTATE(u64, buf, 0x7f48, kvm_read_cr4(vcpu));
+
+	PUT_SMSTATE(u32, buf, 0x7f00, vcpu->arch.smbase);
+
+	/* revision id */
+	PUT_SMSTATE(u32, buf, 0x7efc, 0x00020064);
+
+	PUT_SMSTATE(u64, buf, 0x7ed0, vcpu->arch.efer);
+
+	kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
+	PUT_SMSTATE(u16, buf, 0x7e90, seg.selector);
+	PUT_SMSTATE(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8);
+	PUT_SMSTATE(u32, buf, 0x7e94, seg.limit);
+	PUT_SMSTATE(u64, buf, 0x7e98, seg.base);
+
+	static_call(kvm_x86_get_idt)(vcpu, &dt);
+	PUT_SMSTATE(u32, buf, 0x7e84, dt.size);
+	PUT_SMSTATE(u64, buf, 0x7e88, dt.address);
+
+	kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
+	PUT_SMSTATE(u16, buf, 0x7e70, seg.selector);
+	PUT_SMSTATE(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8);
+	PUT_SMSTATE(u32, buf, 0x7e74, seg.limit);
+	PUT_SMSTATE(u64, buf, 0x7e78, seg.base);
+
+	static_call(kvm_x86_get_gdt)(vcpu, &dt);
+	PUT_SMSTATE(u32, buf, 0x7e64, dt.size);
+	PUT_SMSTATE(u64, buf, 0x7e68, dt.address);
+
+	for (i = 0; i < 6; i++)
+		enter_smm_save_seg_64(vcpu, buf, i);
+}
+#endif
+
+void enter_smm(struct kvm_vcpu *vcpu)
+{
+	struct kvm_segment cs, ds;
+	struct desc_ptr dt;
+	unsigned long cr0;
+	char buf[512];
+
+	memset(buf, 0, 512);
+#ifdef CONFIG_X86_64
+	if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
+		enter_smm_save_state_64(vcpu, buf);
+	else
+#endif
+		enter_smm_save_state_32(vcpu, buf);
+
+	/*
+	 * Give enter_smm() a chance to make ISA-specific changes to the vCPU
+	 * state (e.g. leave guest mode) after we've saved the state into the
+	 * SMM state-save area.
+	 */
+	static_call(kvm_x86_enter_smm)(vcpu, buf);
+
+	kvm_smm_changed(vcpu, true);
+	kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
+
+	if (static_call(kvm_x86_get_nmi_mask)(vcpu))
+		vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
+	else
+		static_call(kvm_x86_set_nmi_mask)(vcpu, true);
+
+	kvm_set_rflags(vcpu, X86_EFLAGS_FIXED);
+	kvm_rip_write(vcpu, 0x8000);
+
+	cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG);
+	static_call(kvm_x86_set_cr0)(vcpu, cr0);
+	vcpu->arch.cr0 = cr0;
+
+	static_call(kvm_x86_set_cr4)(vcpu, 0);
+
+	/* Undocumented: IDT limit is set to zero on entry to SMM.  */
+	dt.address = dt.size = 0;
+	static_call(kvm_x86_set_idt)(vcpu, &dt);
+
+	kvm_set_dr(vcpu, 7, DR7_FIXED_1);
+
+	cs.selector = (vcpu->arch.smbase >> 4) & 0xffff;
+	cs.base = vcpu->arch.smbase;
+
+	ds.selector = 0;
+	ds.base = 0;
+
+	cs.limit    = ds.limit = 0xffffffff;
+	cs.type     = ds.type = 0x3;
+	cs.dpl      = ds.dpl = 0;
+	cs.db       = ds.db = 0;
+	cs.s        = ds.s = 1;
+	cs.l        = ds.l = 0;
+	cs.g        = ds.g = 1;
+	cs.avl      = ds.avl = 0;
+	cs.present  = ds.present = 1;
+	cs.unusable = ds.unusable = 0;
+	cs.padding  = ds.padding = 0;
+
+	kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
+	kvm_set_segment(vcpu, &ds, VCPU_SREG_DS);
+	kvm_set_segment(vcpu, &ds, VCPU_SREG_ES);
+	kvm_set_segment(vcpu, &ds, VCPU_SREG_FS);
+	kvm_set_segment(vcpu, &ds, VCPU_SREG_GS);
+	kvm_set_segment(vcpu, &ds, VCPU_SREG_SS);
+
+#ifdef CONFIG_X86_64
+	if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
+		static_call(kvm_x86_set_efer)(vcpu, 0);
+#endif
+
+	kvm_update_cpuid_runtime(vcpu);
+	kvm_mmu_reset_context(vcpu);
+}
diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
index d85d4ccd32dd..aacc6dac2c99 100644
--- a/arch/x86/kvm/smm.h
+++ b/arch/x86/kvm/smm.h
@@ -20,6 +20,7 @@ static inline bool is_smm(struct kvm_vcpu *vcpu)
 }
 
 void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm);
+void enter_smm(struct kvm_vcpu *vcpu);
 void process_smi(struct kvm_vcpu *vcpu);
 
 #endif
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 54909cd4863f..a03712d00883 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -120,7 +120,6 @@ static u64 __read_mostly cr4_reserved_bits = CR4_RESERVED_BITS;
 
 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
 static void process_nmi(struct kvm_vcpu *vcpu);
-static void enter_smm(struct kvm_vcpu *vcpu);
 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
 static void store_regs(struct kvm_vcpu *vcpu);
 static int sync_regs(struct kvm_vcpu *vcpu);
@@ -7107,8 +7106,8 @@ static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
 	return handled;
 }
 
-static void kvm_set_segment(struct kvm_vcpu *vcpu,
-			struct kvm_segment *var, int seg)
+void kvm_set_segment(struct kvm_vcpu *vcpu,
+		     struct kvm_segment *var, int seg)
 {
 	static_call(kvm_x86_set_segment)(vcpu, var, seg);
 }
@@ -10035,240 +10034,6 @@ static void process_nmi(struct kvm_vcpu *vcpu)
 	kvm_make_request(KVM_REQ_EVENT, vcpu);
 }
 
-static u32 enter_smm_get_segment_flags(struct kvm_segment *seg)
-{
-	u32 flags = 0;
-	flags |= seg->g       << 23;
-	flags |= seg->db      << 22;
-	flags |= seg->l       << 21;
-	flags |= seg->avl     << 20;
-	flags |= seg->present << 15;
-	flags |= seg->dpl     << 13;
-	flags |= seg->s       << 12;
-	flags |= seg->type    << 8;
-	return flags;
-}
-
-static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n)
-{
-	struct kvm_segment seg;
-	int offset;
-
-	kvm_get_segment(vcpu, &seg, n);
-	PUT_SMSTATE(u32, buf, 0x7fa8 + n * 4, seg.selector);
-
-	if (n < 3)
-		offset = 0x7f84 + n * 12;
-	else
-		offset = 0x7f2c + (n - 3) * 12;
-
-	PUT_SMSTATE(u32, buf, offset + 8, seg.base);
-	PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
-	PUT_SMSTATE(u32, buf, offset, enter_smm_get_segment_flags(&seg));
-}
-
-#ifdef CONFIG_X86_64
-static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n)
-{
-	struct kvm_segment seg;
-	int offset;
-	u16 flags;
-
-	kvm_get_segment(vcpu, &seg, n);
-	offset = 0x7e00 + n * 16;
-
-	flags = enter_smm_get_segment_flags(&seg) >> 8;
-	PUT_SMSTATE(u16, buf, offset, seg.selector);
-	PUT_SMSTATE(u16, buf, offset + 2, flags);
-	PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
-	PUT_SMSTATE(u64, buf, offset + 8, seg.base);
-}
-#endif
-
-static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf)
-{
-	struct desc_ptr dt;
-	struct kvm_segment seg;
-	unsigned long val;
-	int i;
-
-	PUT_SMSTATE(u32, buf, 0x7ffc, kvm_read_cr0(vcpu));
-	PUT_SMSTATE(u32, buf, 0x7ff8, kvm_read_cr3(vcpu));
-	PUT_SMSTATE(u32, buf, 0x7ff4, kvm_get_rflags(vcpu));
-	PUT_SMSTATE(u32, buf, 0x7ff0, kvm_rip_read(vcpu));
-
-	for (i = 0; i < 8; i++)
-		PUT_SMSTATE(u32, buf, 0x7fd0 + i * 4, kvm_register_read_raw(vcpu, i));
-
-	kvm_get_dr(vcpu, 6, &val);
-	PUT_SMSTATE(u32, buf, 0x7fcc, (u32)val);
-	kvm_get_dr(vcpu, 7, &val);
-	PUT_SMSTATE(u32, buf, 0x7fc8, (u32)val);
-
-	kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
-	PUT_SMSTATE(u32, buf, 0x7fc4, seg.selector);
-	PUT_SMSTATE(u32, buf, 0x7f64, seg.base);
-	PUT_SMSTATE(u32, buf, 0x7f60, seg.limit);
-	PUT_SMSTATE(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg));
-
-	kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
-	PUT_SMSTATE(u32, buf, 0x7fc0, seg.selector);
-	PUT_SMSTATE(u32, buf, 0x7f80, seg.base);
-	PUT_SMSTATE(u32, buf, 0x7f7c, seg.limit);
-	PUT_SMSTATE(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg));
-
-	static_call(kvm_x86_get_gdt)(vcpu, &dt);
-	PUT_SMSTATE(u32, buf, 0x7f74, dt.address);
-	PUT_SMSTATE(u32, buf, 0x7f70, dt.size);
-
-	static_call(kvm_x86_get_idt)(vcpu, &dt);
-	PUT_SMSTATE(u32, buf, 0x7f58, dt.address);
-	PUT_SMSTATE(u32, buf, 0x7f54, dt.size);
-
-	for (i = 0; i < 6; i++)
-		enter_smm_save_seg_32(vcpu, buf, i);
-
-	PUT_SMSTATE(u32, buf, 0x7f14, kvm_read_cr4(vcpu));
-
-	/* revision id */
-	PUT_SMSTATE(u32, buf, 0x7efc, 0x00020000);
-	PUT_SMSTATE(u32, buf, 0x7ef8, vcpu->arch.smbase);
-}
-
-#ifdef CONFIG_X86_64
-static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf)
-{
-	struct desc_ptr dt;
-	struct kvm_segment seg;
-	unsigned long val;
-	int i;
-
-	for (i = 0; i < 16; i++)
-		PUT_SMSTATE(u64, buf, 0x7ff8 - i * 8, kvm_register_read_raw(vcpu, i));
-
-	PUT_SMSTATE(u64, buf, 0x7f78, kvm_rip_read(vcpu));
-	PUT_SMSTATE(u32, buf, 0x7f70, kvm_get_rflags(vcpu));
-
-	kvm_get_dr(vcpu, 6, &val);
-	PUT_SMSTATE(u64, buf, 0x7f68, val);
-	kvm_get_dr(vcpu, 7, &val);
-	PUT_SMSTATE(u64, buf, 0x7f60, val);
-
-	PUT_SMSTATE(u64, buf, 0x7f58, kvm_read_cr0(vcpu));
-	PUT_SMSTATE(u64, buf, 0x7f50, kvm_read_cr3(vcpu));
-	PUT_SMSTATE(u64, buf, 0x7f48, kvm_read_cr4(vcpu));
-
-	PUT_SMSTATE(u32, buf, 0x7f00, vcpu->arch.smbase);
-
-	/* revision id */
-	PUT_SMSTATE(u32, buf, 0x7efc, 0x00020064);
-
-	PUT_SMSTATE(u64, buf, 0x7ed0, vcpu->arch.efer);
-
-	kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
-	PUT_SMSTATE(u16, buf, 0x7e90, seg.selector);
-	PUT_SMSTATE(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8);
-	PUT_SMSTATE(u32, buf, 0x7e94, seg.limit);
-	PUT_SMSTATE(u64, buf, 0x7e98, seg.base);
-
-	static_call(kvm_x86_get_idt)(vcpu, &dt);
-	PUT_SMSTATE(u32, buf, 0x7e84, dt.size);
-	PUT_SMSTATE(u64, buf, 0x7e88, dt.address);
-
-	kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
-	PUT_SMSTATE(u16, buf, 0x7e70, seg.selector);
-	PUT_SMSTATE(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8);
-	PUT_SMSTATE(u32, buf, 0x7e74, seg.limit);
-	PUT_SMSTATE(u64, buf, 0x7e78, seg.base);
-
-	static_call(kvm_x86_get_gdt)(vcpu, &dt);
-	PUT_SMSTATE(u32, buf, 0x7e64, dt.size);
-	PUT_SMSTATE(u64, buf, 0x7e68, dt.address);
-
-	for (i = 0; i < 6; i++)
-		enter_smm_save_seg_64(vcpu, buf, i);
-}
-#endif
-
-static void enter_smm(struct kvm_vcpu *vcpu)
-{
-	struct kvm_segment cs, ds;
-	struct desc_ptr dt;
-	unsigned long cr0;
-	char buf[512];
-
-	memset(buf, 0, 512);
-#ifdef CONFIG_X86_64
-	if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
-		enter_smm_save_state_64(vcpu, buf);
-	else
-#endif
-		enter_smm_save_state_32(vcpu, buf);
-
-	/*
-	 * Give enter_smm() a chance to make ISA-specific changes to the vCPU
-	 * state (e.g. leave guest mode) after we've saved the state into the
-	 * SMM state-save area.
-	 */
-	static_call(kvm_x86_enter_smm)(vcpu, buf);
-
-	kvm_smm_changed(vcpu, true);
-	kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
-
-	if (static_call(kvm_x86_get_nmi_mask)(vcpu))
-		vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
-	else
-		static_call(kvm_x86_set_nmi_mask)(vcpu, true);
-
-	kvm_set_rflags(vcpu, X86_EFLAGS_FIXED);
-	kvm_rip_write(vcpu, 0x8000);
-
-	cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG);
-	static_call(kvm_x86_set_cr0)(vcpu, cr0);
-	vcpu->arch.cr0 = cr0;
-
-	static_call(kvm_x86_set_cr4)(vcpu, 0);
-
-	/* Undocumented: IDT limit is set to zero on entry to SMM.  */
-	dt.address = dt.size = 0;
-	static_call(kvm_x86_set_idt)(vcpu, &dt);
-
-	kvm_set_dr(vcpu, 7, DR7_FIXED_1);
-
-	cs.selector = (vcpu->arch.smbase >> 4) & 0xffff;
-	cs.base = vcpu->arch.smbase;
-
-	ds.selector = 0;
-	ds.base = 0;
-
-	cs.limit    = ds.limit = 0xffffffff;
-	cs.type     = ds.type = 0x3;
-	cs.dpl      = ds.dpl = 0;
-	cs.db       = ds.db = 0;
-	cs.s        = ds.s = 1;
-	cs.l        = ds.l = 0;
-	cs.g        = ds.g = 1;
-	cs.avl      = ds.avl = 0;
-	cs.present  = ds.present = 1;
-	cs.unusable = ds.unusable = 0;
-	cs.padding  = ds.padding = 0;
-
-	kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
-	kvm_set_segment(vcpu, &ds, VCPU_SREG_DS);
-	kvm_set_segment(vcpu, &ds, VCPU_SREG_ES);
-	kvm_set_segment(vcpu, &ds, VCPU_SREG_FS);
-	kvm_set_segment(vcpu, &ds, VCPU_SREG_GS);
-	kvm_set_segment(vcpu, &ds, VCPU_SREG_SS);
-
-#ifdef CONFIG_X86_64
-	if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
-		static_call(kvm_x86_set_efer)(vcpu, 0);
-#endif
-
-	kvm_update_cpuid_runtime(vcpu);
-	kvm_mmu_reset_context(vcpu);
-}
-
 void kvm_make_scan_ioapic_request_mask(struct kvm *kvm,
 				       unsigned long *vcpu_bitmap)
 {
-- 
2.31.1

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