+++ /dev/null
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Maxim Levitsky <mlevitsk@redhat.com>
-Date: Wed, 3 Aug 2022 18:50:08 +0300
-Subject: [PATCH] KVM: x86: emulator/smm: use smram struct for 64 bit smram
- load/restore
-
-Use kvm_smram_state_64 struct to save/restore the 64 bit SMM state
-(used when X86_FEATURE_LM is present in the guest CPUID,
-regardless of 32-bitness of the guest).
-
-Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
-Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
----
- arch/x86/kvm/emulate.c | 88 ++++++++++++++----------------------------
- arch/x86/kvm/x86.c | 75 ++++++++++++++++-------------------
- 2 files changed, 62 insertions(+), 101 deletions(-)
-
-diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
-index 65d82292ccec..03f9e5aa036e 100644
---- a/arch/x86/kvm/emulate.c
-+++ b/arch/x86/kvm/emulate.c
-@@ -2373,24 +2373,16 @@ static void rsm_load_seg_32(struct x86_emulate_ctxt *ctxt,
- }
-
- #ifdef CONFIG_X86_64
--static int rsm_load_seg_64(struct x86_emulate_ctxt *ctxt, const char *smstate,
-- int n)
-+static void rsm_load_seg_64(struct x86_emulate_ctxt *ctxt,
-+ const struct kvm_smm_seg_state_64 *state,
-+ int n)
- {
- struct desc_struct desc;
-- int offset;
-- u16 selector;
-- u32 base3;
--
-- offset = 0x7e00 + n * 16;
--
-- selector = GET_SMSTATE(u16, smstate, offset);
-- rsm_set_desc_flags(&desc, GET_SMSTATE(u16, smstate, offset + 2) << 8);
-- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, offset + 4));
-- set_desc_base(&desc, GET_SMSTATE(u32, smstate, offset + 8));
-- base3 = GET_SMSTATE(u32, smstate, offset + 12);
-
-- ctxt->ops->set_segment(ctxt, selector, &desc, base3, n);
-- return X86EMUL_CONTINUE;
-+ rsm_set_desc_flags(&desc, state->attributes << 8);
-+ set_desc_limit(&desc, state->limit);
-+ set_desc_base(&desc, (u32)state->base);
-+ ctxt->ops->set_segment(ctxt, state->selector, &desc, state->base >> 32, n);
- }
- #endif
-
-@@ -2484,71 +2476,49 @@ static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
-
- #ifdef CONFIG_X86_64
- static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
-- const char *smstate)
-+ const struct kvm_smram_state_64 *smstate)
- {
-- struct desc_struct desc;
- struct desc_ptr dt;
-- u64 val, cr0, cr3, cr4;
-- u32 base3;
-- u16 selector;
- int i, r;
-
- for (i = 0; i < 16; i++)
-- *reg_write(ctxt, i) = GET_SMSTATE(u64, smstate, 0x7ff8 - i * 8);
-+ *reg_write(ctxt, i) = smstate->gprs[15 - i];
-
-- ctxt->_eip = GET_SMSTATE(u64, smstate, 0x7f78);
-- ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7f70) | X86_EFLAGS_FIXED;
-+ ctxt->_eip = smstate->rip;
-+ ctxt->eflags = smstate->rflags | X86_EFLAGS_FIXED;
-
-- val = GET_SMSTATE(u64, smstate, 0x7f68);
--
-- if (ctxt->ops->set_dr(ctxt, 6, val))
-+ if (ctxt->ops->set_dr(ctxt, 6, smstate->dr6))
- return X86EMUL_UNHANDLEABLE;
--
-- val = GET_SMSTATE(u64, smstate, 0x7f60);
--
-- if (ctxt->ops->set_dr(ctxt, 7, val))
-+ if (ctxt->ops->set_dr(ctxt, 7, smstate->dr7))
- return X86EMUL_UNHANDLEABLE;
-
-- cr0 = GET_SMSTATE(u64, smstate, 0x7f58);
-- cr3 = GET_SMSTATE(u64, smstate, 0x7f50);
-- cr4 = GET_SMSTATE(u64, smstate, 0x7f48);
-- ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7f00));
-- val = GET_SMSTATE(u64, smstate, 0x7ed0);
-+ ctxt->ops->set_smbase(ctxt, smstate->smbase);
-
-- if (ctxt->ops->set_msr(ctxt, MSR_EFER, val & ~EFER_LMA))
-+ if (ctxt->ops->set_msr(ctxt, MSR_EFER, smstate->efer & ~EFER_LMA))
- return X86EMUL_UNHANDLEABLE;
-
-- selector = GET_SMSTATE(u32, smstate, 0x7e90);
-- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e92) << 8);
-- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e94));
-- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e98));
-- base3 = GET_SMSTATE(u32, smstate, 0x7e9c);
-- ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_TR);
-+ rsm_load_seg_64(ctxt, &smstate->tr, VCPU_SREG_TR);
-
-- dt.size = GET_SMSTATE(u32, smstate, 0x7e84);
-- dt.address = GET_SMSTATE(u64, smstate, 0x7e88);
-+ dt.size = smstate->idtr.limit;
-+ dt.address = smstate->idtr.base;
- ctxt->ops->set_idt(ctxt, &dt);
-
-- selector = GET_SMSTATE(u32, smstate, 0x7e70);
-- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e72) << 8);
-- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e74));
-- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e78));
-- base3 = GET_SMSTATE(u32, smstate, 0x7e7c);
-- ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_LDTR);
-+ rsm_load_seg_64(ctxt, &smstate->ldtr, VCPU_SREG_LDTR);
-
-- dt.size = GET_SMSTATE(u32, smstate, 0x7e64);
-- dt.address = GET_SMSTATE(u64, smstate, 0x7e68);
-+ dt.size = smstate->gdtr.limit;
-+ dt.address = smstate->gdtr.base;
- ctxt->ops->set_gdt(ctxt, &dt);
-
-- r = rsm_enter_protected_mode(ctxt, cr0, cr3, cr4);
-+ r = rsm_enter_protected_mode(ctxt, smstate->cr0, smstate->cr3, smstate->cr4);
- if (r != X86EMUL_CONTINUE)
- return r;
-
-- for (i = 0; i < 6; i++) {
-- r = rsm_load_seg_64(ctxt, smstate, i);
-- if (r != X86EMUL_CONTINUE)
-- return r;
-- }
-+ rsm_load_seg_64(ctxt, &smstate->es, VCPU_SREG_ES);
-+ rsm_load_seg_64(ctxt, &smstate->cs, VCPU_SREG_CS);
-+ rsm_load_seg_64(ctxt, &smstate->ss, VCPU_SREG_SS);
-+ rsm_load_seg_64(ctxt, &smstate->ds, VCPU_SREG_DS);
-+ rsm_load_seg_64(ctxt, &smstate->fs, VCPU_SREG_FS);
-+ rsm_load_seg_64(ctxt, &smstate->gs, VCPU_SREG_GS);
-
- return X86EMUL_CONTINUE;
- }
-@@ -2623,7 +2593,7 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt)
-
- #ifdef CONFIG_X86_64
- if (emulator_has_longmode(ctxt))
-- ret = rsm_load_state_64(ctxt, (const char *)&smram);
-+ ret = rsm_load_state_64(ctxt, &smram.smram64);
- else
- #endif
- ret = rsm_load_state_32(ctxt, &smram.smram32);
-diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
-index 579a1cb6a7c8..7a4d86f9bdcd 100644
---- a/arch/x86/kvm/x86.c
-+++ b/arch/x86/kvm/x86.c
-@@ -10115,20 +10115,17 @@ static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu,
- }
-
- #ifdef CONFIG_X86_64
--static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n)
-+static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu,
-+ struct kvm_smm_seg_state_64 *state,
-+ 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);
-+ state->selector = seg.selector;
-+ state->attributes = enter_smm_get_segment_flags(&seg) >> 8;
-+ state->limit = seg.limit;
-+ state->base = seg.base;
- }
- #endif
-
-@@ -10176,57 +10173,51 @@ static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, struct kvm_smram_stat
- }
-
- #ifdef CONFIG_X86_64
--static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf)
-+static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, struct kvm_smram_state_64 *smram)
- {
- 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));
-+ smram->gprs[15 - i] = kvm_register_read_raw(vcpu, i);
-+
-+ smram->rip = kvm_rip_read(vcpu);
-+ smram->rflags = kvm_get_rflags(vcpu);
-
-- 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);
-+ smram->dr6 = 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));
-+ smram->dr7 = val;
-
-- put_smstate(u32, buf, 0x7f00, vcpu->arch.smbase);
-+ smram->cr0 = kvm_read_cr0(vcpu);
-+ smram->cr3 = kvm_read_cr3(vcpu);
-+ smram->cr4 = kvm_read_cr4(vcpu);
-
-- /* revision id */
-- put_smstate(u32, buf, 0x7efc, 0x00020064);
-+ smram->smbase = vcpu->arch.smbase;
-+ smram->smm_revison = 0x00020064;
-
-- put_smstate(u64, buf, 0x7ed0, vcpu->arch.efer);
-+ smram->efer = 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);
-+ enter_smm_save_seg_64(vcpu, &smram->tr, VCPU_SREG_TR);
-
- static_call(kvm_x86_get_idt)(vcpu, &dt);
-- put_smstate(u32, buf, 0x7e84, dt.size);
-- put_smstate(u64, buf, 0x7e88, dt.address);
-+ smram->idtr.limit = dt.size;
-+ smram->idtr.base = 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);
-+ enter_smm_save_seg_64(vcpu, &smram->ldtr, VCPU_SREG_LDTR);
-
- static_call(kvm_x86_get_gdt)(vcpu, &dt);
-- put_smstate(u32, buf, 0x7e64, dt.size);
-- put_smstate(u64, buf, 0x7e68, dt.address);
-+ smram->gdtr.limit = dt.size;
-+ smram->gdtr.base = dt.address;
-
-- for (i = 0; i < 6; i++)
-- enter_smm_save_seg_64(vcpu, buf, i);
-+ enter_smm_save_seg_64(vcpu, &smram->es, VCPU_SREG_ES);
-+ enter_smm_save_seg_64(vcpu, &smram->cs, VCPU_SREG_CS);
-+ enter_smm_save_seg_64(vcpu, &smram->ss, VCPU_SREG_SS);
-+ enter_smm_save_seg_64(vcpu, &smram->ds, VCPU_SREG_DS);
-+ enter_smm_save_seg_64(vcpu, &smram->fs, VCPU_SREG_FS);
-+ enter_smm_save_seg_64(vcpu, &smram->gs, VCPU_SREG_GS);
- }
- #endif
-
-@@ -10240,7 +10231,7 @@ static void enter_smm(struct kvm_vcpu *vcpu)
- 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, (char *)&smram);
-+ enter_smm_save_state_64(vcpu, &smram.smram64);
- else
- #endif
- enter_smm_save_state_32(vcpu, &smram.smram32);
projects / pve-kernel.git / blobdiff