[PATCH RESEND v4 18/23] KVM: x86: smm: use smram struct for 32 bit smram load/restore
From: Maxim Levitsky
Date: Tue Oct 25 2022 - 08:52:44 EST
Use kvm_smram_state_32 struct to save/restore 32 bit SMM state
(used when X86_FEATURE_LM is not present in the guest CPUID).
Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
---
arch/x86/kvm/smm.c | 155 ++++++++++++++++++---------------------------
1 file changed, 61 insertions(+), 94 deletions(-)
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index e714d43b746cce..2635f6b1d81a3c 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -142,22 +142,17 @@ static u32 enter_smm_get_segment_flags(struct kvm_segment *seg)
return flags;
}
-static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n)
+static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu,
+ struct kvm_smm_seg_state_32 *state,
+ u32 *selector, 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));
+ *selector = seg.selector;
+ state->base = seg.base;
+ state->limit = seg.limit;
+ state->flags = enter_smm_get_segment_flags(&seg);
}
#ifdef CONFIG_X86_64
@@ -178,54 +173,48 @@ static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n)
}
#endif
-static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf)
+static void enter_smm_save_state_32(struct kvm_vcpu *vcpu,
+ struct kvm_smram_state_32 *smram)
{
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));
+ smram->cr0 = kvm_read_cr0(vcpu);
+ smram->cr3 = kvm_read_cr3(vcpu);
+ smram->eflags = kvm_get_rflags(vcpu);
+ smram->eip = kvm_rip_read(vcpu);
for (i = 0; i < 8; i++)
- PUT_SMSTATE(u32, buf, 0x7fd0 + i * 4, kvm_register_read_raw(vcpu, i));
+ smram->gprs[i] = kvm_register_read_raw(vcpu, i);
kvm_get_dr(vcpu, 6, &val);
- PUT_SMSTATE(u32, buf, 0x7fcc, (u32)val);
+ smram->dr6 = (u32)val;
kvm_get_dr(vcpu, 7, &val);
- PUT_SMSTATE(u32, buf, 0x7fc8, (u32)val);
+ smram->dr7 = (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));
+ enter_smm_save_seg_32(vcpu, &smram->tr, &smram->tr_sel, VCPU_SREG_TR);
+ enter_smm_save_seg_32(vcpu, &smram->ldtr, &smram->ldtr_sel, VCPU_SREG_LDTR);
static_call(kvm_x86_get_gdt)(vcpu, &dt);
- PUT_SMSTATE(u32, buf, 0x7f74, dt.address);
- PUT_SMSTATE(u32, buf, 0x7f70, dt.size);
+ smram->gdtr.base = dt.address;
+ smram->gdtr.limit = dt.size;
static_call(kvm_x86_get_idt)(vcpu, &dt);
- PUT_SMSTATE(u32, buf, 0x7f58, dt.address);
- PUT_SMSTATE(u32, buf, 0x7f54, dt.size);
+ smram->idtr.base = dt.address;
+ smram->idtr.limit = dt.size;
- for (i = 0; i < 6; i++)
- enter_smm_save_seg_32(vcpu, buf, i);
+ enter_smm_save_seg_32(vcpu, &smram->es, &smram->es_sel, VCPU_SREG_ES);
+ enter_smm_save_seg_32(vcpu, &smram->cs, &smram->cs_sel, VCPU_SREG_CS);
+ enter_smm_save_seg_32(vcpu, &smram->ss, &smram->ss_sel, VCPU_SREG_SS);
- PUT_SMSTATE(u32, buf, 0x7f14, kvm_read_cr4(vcpu));
+ enter_smm_save_seg_32(vcpu, &smram->ds, &smram->ds_sel, VCPU_SREG_DS);
+ enter_smm_save_seg_32(vcpu, &smram->fs, &smram->fs_sel, VCPU_SREG_FS);
+ enter_smm_save_seg_32(vcpu, &smram->gs, &smram->gs_sel, VCPU_SREG_GS);
- /* revision id */
- PUT_SMSTATE(u32, buf, 0x7efc, 0x00020000);
- PUT_SMSTATE(u32, buf, 0x7ef8, vcpu->arch.smbase);
+ smram->cr4 = kvm_read_cr4(vcpu);
+ smram->smm_revision = 0x00020000;
+ smram->smbase = vcpu->arch.smbase;
}
#ifdef CONFIG_X86_64
@@ -299,7 +288,7 @@ void enter_smm(struct kvm_vcpu *vcpu)
enter_smm_save_state_64(vcpu, smram.bytes);
else
#endif
- enter_smm_save_state_32(vcpu, smram.bytes);
+ enter_smm_save_state_32(vcpu, &smram.smram32);
/*
* Give enter_smm() a chance to make ISA-specific changes to the vCPU
@@ -391,21 +380,16 @@ static void rsm_set_desc_flags(struct kvm_segment *desc, u32 flags)
desc->padding = 0;
}
-static int rsm_load_seg_32(struct kvm_vcpu *vcpu, const char *smstate,
- int n)
+static int rsm_load_seg_32(struct kvm_vcpu *vcpu,
+ const struct kvm_smm_seg_state_32 *state,
+ u16 selector, int n)
{
struct kvm_segment desc;
- int offset;
-
- if (n < 3)
- offset = 0x7f84 + n * 12;
- else
- offset = 0x7f2c + (n - 3) * 12;
- desc.selector = GET_SMSTATE(u32, smstate, 0x7fa8 + n * 4);
- desc.base = GET_SMSTATE(u32, smstate, offset + 8);
- desc.limit = GET_SMSTATE(u32, smstate, offset + 4);
- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, offset));
+ desc.selector = selector;
+ desc.base = state->base;
+ desc.limit = state->limit;
+ rsm_set_desc_flags(&desc, state->flags);
kvm_set_segment(vcpu, &desc, n);
return X86EMUL_CONTINUE;
}
@@ -474,63 +458,46 @@ static int rsm_enter_protected_mode(struct kvm_vcpu *vcpu,
}
static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
- u8 *smstate)
+ const struct kvm_smram_state_32 *smstate)
{
struct kvm_vcpu *vcpu = ctxt->vcpu;
- struct kvm_segment desc;
struct desc_ptr dt;
- u32 val, cr0, cr3, cr4;
int i;
- cr0 = GET_SMSTATE(u32, smstate, 0x7ffc);
- cr3 = GET_SMSTATE(u32, smstate, 0x7ff8);
- ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7ff4) | X86_EFLAGS_FIXED;
- ctxt->_eip = GET_SMSTATE(u32, smstate, 0x7ff0);
+ ctxt->eflags = smstate->eflags | X86_EFLAGS_FIXED;
+ ctxt->_eip = smstate->eip;
for (i = 0; i < 8; i++)
- *reg_write(ctxt, i) = GET_SMSTATE(u32, smstate, 0x7fd0 + i * 4);
-
- val = GET_SMSTATE(u32, smstate, 0x7fcc);
+ *reg_write(ctxt, i) = smstate->gprs[i];
- if (kvm_set_dr(vcpu, 6, val))
+ if (kvm_set_dr(vcpu, 6, smstate->dr6))
return X86EMUL_UNHANDLEABLE;
-
- val = GET_SMSTATE(u32, smstate, 0x7fc8);
-
- if (kvm_set_dr(vcpu, 7, val))
+ if (kvm_set_dr(vcpu, 7, smstate->dr7))
return X86EMUL_UNHANDLEABLE;
- desc.selector = GET_SMSTATE(u32, smstate, 0x7fc4);
- desc.base = GET_SMSTATE(u32, smstate, 0x7f64);
- desc.limit = GET_SMSTATE(u32, smstate, 0x7f60);
- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f5c));
- kvm_set_segment(vcpu, &desc, VCPU_SREG_TR);
-
- desc.selector = GET_SMSTATE(u32, smstate, 0x7fc0);
- desc.base = GET_SMSTATE(u32, smstate, 0x7f80);
- desc.limit = GET_SMSTATE(u32, smstate, 0x7f7c);
- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f78));
- kvm_set_segment(vcpu, &desc, VCPU_SREG_LDTR);
+ rsm_load_seg_32(vcpu, &smstate->tr, smstate->tr_sel, VCPU_SREG_TR);
+ rsm_load_seg_32(vcpu, &smstate->ldtr, smstate->ldtr_sel, VCPU_SREG_LDTR);
- dt.address = GET_SMSTATE(u32, smstate, 0x7f74);
- dt.size = GET_SMSTATE(u32, smstate, 0x7f70);
+ dt.address = smstate->gdtr.base;
+ dt.size = smstate->gdtr.limit;
static_call(kvm_x86_set_gdt)(vcpu, &dt);
- dt.address = GET_SMSTATE(u32, smstate, 0x7f58);
- dt.size = GET_SMSTATE(u32, smstate, 0x7f54);
+ dt.address = smstate->idtr.base;
+ dt.size = smstate->idtr.limit;
static_call(kvm_x86_set_idt)(vcpu, &dt);
- for (i = 0; i < 6; i++) {
- int r = rsm_load_seg_32(vcpu, smstate, i);
- if (r != X86EMUL_CONTINUE)
- return r;
- }
+ rsm_load_seg_32(vcpu, &smstate->es, smstate->es_sel, VCPU_SREG_ES);
+ rsm_load_seg_32(vcpu, &smstate->cs, smstate->cs_sel, VCPU_SREG_CS);
+ rsm_load_seg_32(vcpu, &smstate->ss, smstate->ss_sel, VCPU_SREG_SS);
- cr4 = GET_SMSTATE(u32, smstate, 0x7f14);
+ rsm_load_seg_32(vcpu, &smstate->ds, smstate->ds_sel, VCPU_SREG_DS);
+ rsm_load_seg_32(vcpu, &smstate->fs, smstate->fs_sel, VCPU_SREG_FS);
+ rsm_load_seg_32(vcpu, &smstate->gs, smstate->gs_sel, VCPU_SREG_GS);
- vcpu->arch.smbase = GET_SMSTATE(u32, smstate, 0x7ef8);
+ vcpu->arch.smbase = smstate->smbase;
- return rsm_enter_protected_mode(vcpu, cr0, cr3, cr4);
+ return rsm_enter_protected_mode(vcpu, smstate->cr0,
+ smstate->cr3, smstate->cr4);
}
#ifdef CONFIG_X86_64
@@ -675,5 +642,5 @@ int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
return rsm_load_state_64(ctxt, smram.bytes);
else
#endif
- return rsm_load_state_32(ctxt, smram.bytes);
+ return rsm_load_state_32(ctxt, &smram.smram32);
}
--
2.34.3