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From: Maxim Levitsky <mlevitsk@redhat.com>
To: kvm@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Yang Zhong <yang.zhong@intel.com>,
	x86@kernel.org, Jim Mattson <jmattson@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Wanpeng Li <wanpengli@tencent.com>, Shuah Khan <shuah@kernel.org>,
	Guang Zeng <guang.zeng@intel.com>, Joerg Roedel <joro@8bytes.org>,
	Maxim Levitsky <mlevitsk@redhat.com>,
	linux-kernel@vger.kernel.org,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Ingo Molnar <mingo@redhat.com>,
	linux-kselftest@vger.kernel.org,
	Kees Cook <keescook@chromium.org>,
	"H. Peter Anvin" <hpa@zytor.com>, Wei Wang <wei.w.wang@intel.com>,
	Borislav Petkov <bp@alien8.de>
Subject: [PATCH RESEND v4 02/23] KVM: x86: move SMM entry to a new file
Date: Tue, 25 Oct 2022 15:47:20 +0300	[thread overview]
Message-ID: <20221025124741.228045-3-mlevitsk@redhat.com> (raw)
In-Reply-To: <20221025124741.228045-1-mlevitsk@redhat.com>

From: Paolo Bonzini <pbonzini@redhat.com>

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@redhat.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 af9798681f88a1..4afed04fcc8241 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 b91c48d91f6ed9..26a6859e421fe1 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 d85d4ccd32dd13..aacc6dac2c99a1 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 6a5cebf7250826..1f69f54d1dbc82 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);
@@ -7056,8 +7055,8 @@ 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);
 }
@@ -9981,240 +9980,6 @@ 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)
 {
-- 
2.34.3


  parent reply	other threads:[~2022-10-25 12:50 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-25 12:47 [PATCH RESEND v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 01/23] KVM: x86: start moving SMM-related functions to new files Maxim Levitsky
2022-10-25 12:47 ` Maxim Levitsky [this message]
2022-10-25 12:47 ` [PATCH RESEND v4 03/23] KVM: x86: move SMM exit to a new file Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 04/23] KVM: x86: do not go through ctxt->ops when emulating rsm Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 05/23] KVM: allow compiling out SMM support Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 06/23] KVM: x86: compile out vendor-specific code if SMM is disabled Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 07/23] KVM: x86: remove SMRAM address space if SMM is not supported Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 08/23] KVM: x86: do not define KVM_REQ_SMI if SMM disabled Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 09/23] bug: introduce ASSERT_STRUCT_OFFSET Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 10/23] KVM: x86: emulator: em_sysexit should update ctxt->mode Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 11/23] KVM: x86: emulator: introduce emulator_recalc_and_set_mode Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 12/23] KVM: x86: emulator: update the emulation mode after rsm Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 13/23] KVM: x86: emulator: update the emulation mode after CR0 write Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 14/23] KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 15/23] KVM: x86: smm: check for failures on smm entry Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 16/23] KVM: x86: smm: add structs for KVM's smram layout Maxim Levitsky
2022-10-28 13:34   ` Paolo Bonzini
2022-10-25 12:47 ` [PATCH RESEND v4 17/23] KVM: x86: smm: use smram structs in the common code Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 18/23] KVM: x86: smm: use smram struct for 32 bit smram load/restore Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 19/23] KVM: x86: smm: use smram struct for 64 " Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 20/23] KVM: svm: drop explicit return value of kvm_vcpu_map Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 21/23] KVM: x86: SVM: use smram structs Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 22/23] KVM: x86: SVM: don't save SVM state to SMRAM when VM is not long mode capable Maxim Levitsky
2022-10-25 12:47 ` [PATCH RESEND v4 23/23] KVM: x86: smm: preserve interrupt shadow in SMRAM Maxim Levitsky
2022-10-28 10:35   ` Paolo Bonzini
2022-10-30  8:23     ` Maxim Levitsky
2022-10-27 16:49 ` [PATCH RESEND v4 00/23] SMM emulation and interrupt shadow fixes Paolo Bonzini
2022-10-27 17:06   ` Maxim Levitsky
2022-10-28 10:36     ` Paolo Bonzini
2022-10-28 22:42       ` Sean Christopherson

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