+++ /dev/null
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Maxim Levitsky <mlevitsk@redhat.com>
-Date: Wed, 3 Aug 2022 18:50:06 +0300
-Subject: [PATCH] KVM: x86: emulator/smm: use smram structs in the common code
-
-Switch from using a raw array to 'union kvm_smram'.
-
-Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
-Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
----
- arch/x86/include/asm/kvm_host.h | 5 +++--
- arch/x86/kvm/emulate.c | 12 +++++++-----
- arch/x86/kvm/kvm_emulate.h | 3 ++-
- arch/x86/kvm/svm/svm.c | 8 ++++++--
- arch/x86/kvm/vmx/vmx.c | 4 ++--
- arch/x86/kvm/x86.c | 16 ++++++++--------
- 6 files changed, 28 insertions(+), 20 deletions(-)
-
-diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
-index f05ebaa26f0f..6885f3839e25 100644
---- a/arch/x86/include/asm/kvm_host.h
-+++ b/arch/x86/include/asm/kvm_host.h
-@@ -204,6 +204,7 @@ typedef enum exit_fastpath_completion fastpath_t;
-
- struct x86_emulate_ctxt;
- struct x86_exception;
-+union kvm_smram;
- enum x86_intercept;
- enum x86_intercept_stage;
-
-@@ -1613,8 +1614,8 @@ struct kvm_x86_ops {
- void (*setup_mce)(struct kvm_vcpu *vcpu);
-
- int (*smi_allowed)(struct kvm_vcpu *vcpu, bool for_injection);
-- int (*enter_smm)(struct kvm_vcpu *vcpu, char *smstate);
-- int (*leave_smm)(struct kvm_vcpu *vcpu, const char *smstate);
-+ int (*enter_smm)(struct kvm_vcpu *vcpu, union kvm_smram *smram);
-+ int (*leave_smm)(struct kvm_vcpu *vcpu, const union kvm_smram *smram);
- void (*enable_smi_window)(struct kvm_vcpu *vcpu);
-
- int (*mem_enc_ioctl)(struct kvm *kvm, void __user *argp);
-diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
-index 470dd4453b01..7294dffa794a 100644
---- a/arch/x86/kvm/emulate.c
-+++ b/arch/x86/kvm/emulate.c
-@@ -2582,16 +2582,18 @@ static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
- static int em_rsm(struct x86_emulate_ctxt *ctxt)
- {
- unsigned long cr0, cr4, efer;
-- char buf[512];
-+ const union kvm_smram smram;
- u64 smbase;
- int ret;
-
-+ BUILD_BUG_ON(sizeof(smram) != 512);
-+
- if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_MASK) == 0)
- return emulate_ud(ctxt);
-
- smbase = ctxt->ops->get_smbase(ctxt);
-
-- ret = ctxt->ops->read_phys(ctxt, smbase + 0xfe00, buf, sizeof(buf));
-+ ret = ctxt->ops->read_phys(ctxt, smbase + 0xfe00, (void *)&smram, sizeof(smram));
- if (ret != X86EMUL_CONTINUE)
- return X86EMUL_UNHANDLEABLE;
-
-@@ -2641,15 +2643,15 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt)
- * state (e.g. enter guest mode) before loading state from the SMM
- * state-save area.
- */
-- if (ctxt->ops->leave_smm(ctxt, buf))
-+ if (ctxt->ops->leave_smm(ctxt, &smram))
- goto emulate_shutdown;
-
- #ifdef CONFIG_X86_64
- if (emulator_has_longmode(ctxt))
-- ret = rsm_load_state_64(ctxt, buf);
-+ ret = rsm_load_state_64(ctxt, (const char *)&smram);
- else
- #endif
-- ret = rsm_load_state_32(ctxt, buf);
-+ ret = rsm_load_state_32(ctxt, (const char *)&smram);
-
- if (ret != X86EMUL_CONTINUE)
- goto emulate_shutdown;
-diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
-index dd0ae61e44a1..76c0b8e7890b 100644
---- a/arch/x86/kvm/kvm_emulate.h
-+++ b/arch/x86/kvm/kvm_emulate.h
-@@ -19,6 +19,7 @@
- struct x86_emulate_ctxt;
- enum x86_intercept;
- enum x86_intercept_stage;
-+union kvm_smram;
-
- struct x86_exception {
- u8 vector;
-@@ -236,7 +237,7 @@ struct x86_emulate_ops {
-
- unsigned (*get_hflags)(struct x86_emulate_ctxt *ctxt);
- void (*exiting_smm)(struct x86_emulate_ctxt *ctxt);
-- int (*leave_smm)(struct x86_emulate_ctxt *ctxt, const char *smstate);
-+ int (*leave_smm)(struct x86_emulate_ctxt *ctxt, const union kvm_smram *smram);
- void (*triple_fault)(struct x86_emulate_ctxt *ctxt);
- int (*set_xcr)(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr);
- };
-diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
-index ce362e88a567..45c4def86cd3 100644
---- a/arch/x86/kvm/svm/svm.c
-+++ b/arch/x86/kvm/svm/svm.c
-@@ -4385,12 +4385,14 @@ static int svm_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
- return 1;
- }
-
--static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
-+static int svm_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram)
- {
- struct vcpu_svm *svm = to_svm(vcpu);
- struct kvm_host_map map_save;
- int ret;
-
-+ char *smstate = (char *)smram;
-+
- if (!is_guest_mode(vcpu))
- return 0;
-
-@@ -4432,7 +4434,7 @@ static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
- return 0;
- }
-
--static int svm_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
-+static int svm_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram)
- {
- struct vcpu_svm *svm = to_svm(vcpu);
- struct kvm_host_map map, map_save;
-@@ -4440,6 +4442,8 @@ static int svm_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
- struct vmcb *vmcb12;
- int ret;
-
-+ const char *smstate = (const char *)smram;
-+
- if (!guest_cpuid_has(vcpu, X86_FEATURE_LM))
- return 0;
-
-diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
-index 63247c57c72c..4319f65181f7 100644
---- a/arch/x86/kvm/vmx/vmx.c
-+++ b/arch/x86/kvm/vmx/vmx.c
-@@ -7914,7 +7914,7 @@ static int vmx_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
- return !is_smm(vcpu);
- }
-
--static int vmx_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
-+static int vmx_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram)
- {
- struct vcpu_vmx *vmx = to_vmx(vcpu);
-
-@@ -7935,7 +7935,7 @@ static int vmx_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
- return 0;
- }
-
--static int vmx_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
-+static int vmx_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram)
- {
- struct vcpu_vmx *vmx = to_vmx(vcpu);
- int ret;
-diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
-index 20aec64e3521..94c29391b065 100644
---- a/arch/x86/kvm/x86.c
-+++ b/arch/x86/kvm/x86.c
-@@ -8186,9 +8186,9 @@ static void emulator_exiting_smm(struct x86_emulate_ctxt *ctxt)
- }
-
- static int emulator_leave_smm(struct x86_emulate_ctxt *ctxt,
-- const char *smstate)
-+ const union kvm_smram *smram)
- {
-- return static_call(kvm_x86_leave_smm)(emul_to_vcpu(ctxt), smstate);
-+ return static_call(kvm_x86_leave_smm)(emul_to_vcpu(ctxt), smram);
- }
-
- static void emulator_triple_fault(struct x86_emulate_ctxt *ctxt)
-@@ -10246,25 +10246,25 @@ static void enter_smm(struct kvm_vcpu *vcpu)
- struct kvm_segment cs, ds;
- struct desc_ptr dt;
- unsigned long cr0;
-- char buf[512];
-+ union kvm_smram smram;
-
-- memset(buf, 0, 512);
-+ memset(smram.bytes, 0, sizeof(smram.bytes));
- #ifdef CONFIG_X86_64
- if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
-- enter_smm_save_state_64(vcpu, buf);
-+ enter_smm_save_state_64(vcpu, (char *)&smram);
- else
- #endif
-- enter_smm_save_state_32(vcpu, buf);
-+ enter_smm_save_state_32(vcpu, (char *)&smram);
-
- /*
- * 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);
-+ static_call(kvm_x86_enter_smm)(vcpu, &smram);
-
- kvm_smm_changed(vcpu, true);
-- kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
-+ kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, &smram, sizeof(smram));
-
- if (static_call(kvm_x86_get_nmi_mask)(vcpu))
- vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
projects / pve-kernel.git / blobdiff