--- /dev/null
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Maxim Levitsky <mlevitsk@redhat.com>
+Date: Wed, 3 Aug 2022 18:50:05 +0300
+Subject: [PATCH] KVM: x86: emulator/smm: add structs for KVM's smram layout
+
+Those structs will be used to read/write the smram state image.
+
+Also document the differences between KVM's SMRAM layout and SMRAM
+layout that is used by real Intel/AMD cpus.
+
+Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
+Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
+---
+ arch/x86/kvm/emulate.c | 6 +
+ arch/x86/kvm/kvm_emulate.h | 218 +++++++++++++++++++++++++++++++++++++
+ arch/x86/kvm/x86.c | 1 +
+ 3 files changed, 225 insertions(+)
+
+diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
+index 4f7f5117ec7a..470dd4453b01 100644
+--- a/arch/x86/kvm/emulate.c
++++ b/arch/x86/kvm/emulate.c
+@@ -5856,3 +5856,9 @@ bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt)
+
+ return true;
+ }
++
++void __init kvm_emulator_init(void)
++{
++ __check_smram32_offsets();
++ __check_smram64_offsets();
++}
+diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
+index 89246446d6aa..dd0ae61e44a1 100644
+--- a/arch/x86/kvm/kvm_emulate.h
++++ b/arch/x86/kvm/kvm_emulate.h
+@@ -13,6 +13,7 @@
+ #define _ASM_X86_KVM_X86_EMULATE_H
+
+ #include <asm/desc_defs.h>
++#include <linux/build_bug.h>
+ #include "fpu.h"
+
+ struct x86_emulate_ctxt;
+@@ -503,6 +504,223 @@ enum x86_intercept {
+ nr_x86_intercepts
+ };
+
++
++/* 32 bit KVM's emulated SMM layout. Loosely based on Intel's layout */
++
++struct kvm_smm_seg_state_32 {
++ u32 flags;
++ u32 limit;
++ u32 base;
++} __packed;
++
++struct kvm_smram_state_32 {
++ u32 reserved1[62];
++ u32 smbase;
++ u32 smm_revision;
++ u32 reserved2[5];
++ u32 cr4; /* CR4 is not present in Intel/AMD SMRAM image */
++ u32 reserved3[5];
++
++ /*
++ * Segment state is not present/documented in the Intel/AMD SMRAM image
++ * Instead this area on Intel/AMD contains IO/HLT restart flags.
++ */
++ struct kvm_smm_seg_state_32 ds;
++ struct kvm_smm_seg_state_32 fs;
++ struct kvm_smm_seg_state_32 gs;
++ struct kvm_smm_seg_state_32 idtr; /* IDTR has only base and limit */
++ struct kvm_smm_seg_state_32 tr;
++ u32 reserved;
++ struct kvm_smm_seg_state_32 gdtr; /* GDTR has only base and limit */
++ struct kvm_smm_seg_state_32 ldtr;
++ struct kvm_smm_seg_state_32 es;
++ struct kvm_smm_seg_state_32 cs;
++ struct kvm_smm_seg_state_32 ss;
++
++ u32 es_sel;
++ u32 cs_sel;
++ u32 ss_sel;
++ u32 ds_sel;
++ u32 fs_sel;
++ u32 gs_sel;
++ u32 ldtr_sel;
++ u32 tr_sel;
++
++ u32 dr7;
++ u32 dr6;
++ u32 gprs[8]; /* GPRS in the "natural" X86 order (EAX/ECX/EDX.../EDI) */
++ u32 eip;
++ u32 eflags;
++ u32 cr3;
++ u32 cr0;
++} __packed;
++
++
++static inline void __check_smram32_offsets(void)
++{
++#define __CHECK_SMRAM32_OFFSET(field, offset) \
++ ASSERT_STRUCT_OFFSET(struct kvm_smram_state_32, field, offset - 0xFE00)
++
++ __CHECK_SMRAM32_OFFSET(reserved1, 0xFE00);
++ __CHECK_SMRAM32_OFFSET(smbase, 0xFEF8);
++ __CHECK_SMRAM32_OFFSET(smm_revision, 0xFEFC);
++ __CHECK_SMRAM32_OFFSET(reserved2, 0xFF00);
++ __CHECK_SMRAM32_OFFSET(cr4, 0xFF14);
++ __CHECK_SMRAM32_OFFSET(reserved3, 0xFF18);
++ __CHECK_SMRAM32_OFFSET(ds, 0xFF2C);
++ __CHECK_SMRAM32_OFFSET(fs, 0xFF38);
++ __CHECK_SMRAM32_OFFSET(gs, 0xFF44);
++ __CHECK_SMRAM32_OFFSET(idtr, 0xFF50);
++ __CHECK_SMRAM32_OFFSET(tr, 0xFF5C);
++ __CHECK_SMRAM32_OFFSET(gdtr, 0xFF6C);
++ __CHECK_SMRAM32_OFFSET(ldtr, 0xFF78);
++ __CHECK_SMRAM32_OFFSET(es, 0xFF84);
++ __CHECK_SMRAM32_OFFSET(cs, 0xFF90);
++ __CHECK_SMRAM32_OFFSET(ss, 0xFF9C);
++ __CHECK_SMRAM32_OFFSET(es_sel, 0xFFA8);
++ __CHECK_SMRAM32_OFFSET(cs_sel, 0xFFAC);
++ __CHECK_SMRAM32_OFFSET(ss_sel, 0xFFB0);
++ __CHECK_SMRAM32_OFFSET(ds_sel, 0xFFB4);
++ __CHECK_SMRAM32_OFFSET(fs_sel, 0xFFB8);
++ __CHECK_SMRAM32_OFFSET(gs_sel, 0xFFBC);
++ __CHECK_SMRAM32_OFFSET(ldtr_sel, 0xFFC0);
++ __CHECK_SMRAM32_OFFSET(tr_sel, 0xFFC4);
++ __CHECK_SMRAM32_OFFSET(dr7, 0xFFC8);
++ __CHECK_SMRAM32_OFFSET(dr6, 0xFFCC);
++ __CHECK_SMRAM32_OFFSET(gprs, 0xFFD0);
++ __CHECK_SMRAM32_OFFSET(eip, 0xFFF0);
++ __CHECK_SMRAM32_OFFSET(eflags, 0xFFF4);
++ __CHECK_SMRAM32_OFFSET(cr3, 0xFFF8);
++ __CHECK_SMRAM32_OFFSET(cr0, 0xFFFC);
++#undef __CHECK_SMRAM32_OFFSET
++}
++
++
++/* 64 bit KVM's emulated SMM layout. Based on AMD64 layout */
++
++struct kvm_smm_seg_state_64 {
++ u16 selector;
++ u16 attributes;
++ u32 limit;
++ u64 base;
++};
++
++struct kvm_smram_state_64 {
++
++ struct kvm_smm_seg_state_64 es;
++ struct kvm_smm_seg_state_64 cs;
++ struct kvm_smm_seg_state_64 ss;
++ struct kvm_smm_seg_state_64 ds;
++ struct kvm_smm_seg_state_64 fs;
++ struct kvm_smm_seg_state_64 gs;
++ struct kvm_smm_seg_state_64 gdtr; /* GDTR has only base and limit*/
++ struct kvm_smm_seg_state_64 ldtr;
++ struct kvm_smm_seg_state_64 idtr; /* IDTR has only base and limit*/
++ struct kvm_smm_seg_state_64 tr;
++
++ /* I/O restart and auto halt restart are not implemented by KVM */
++ u64 io_restart_rip;
++ u64 io_restart_rcx;
++ u64 io_restart_rsi;
++ u64 io_restart_rdi;
++ u32 io_restart_dword;
++ u32 reserved1;
++ u8 io_inst_restart;
++ u8 auto_hlt_restart;
++ u8 reserved2[6];
++
++ u64 efer;
++
++ /*
++ * Two fields below are implemented on AMD only, to store
++ * SVM guest vmcb address if the #SMI was received while in the guest mode.
++ */
++ u64 svm_guest_flag;
++ u64 svm_guest_vmcb_gpa;
++ u64 svm_guest_virtual_int; /* unknown purpose, not implemented */
++
++ u32 reserved3[3];
++ u32 smm_revison;
++ u32 smbase;
++ u32 reserved4[5];
++
++ /* ssp and svm_* fields below are not implemented by KVM */
++ u64 ssp;
++ u64 svm_guest_pat;
++ u64 svm_host_efer;
++ u64 svm_host_cr4;
++ u64 svm_host_cr3;
++ u64 svm_host_cr0;
++
++ u64 cr4;
++ u64 cr3;
++ u64 cr0;
++ u64 dr7;
++ u64 dr6;
++ u64 rflags;
++ u64 rip;
++ u64 gprs[16]; /* GPRS in a reversed "natural" X86 order (R15/R14/../RCX/RAX.) */
++};
++
++
++static inline void __check_smram64_offsets(void)
++{
++#define __CHECK_SMRAM64_OFFSET(field, offset) \
++ ASSERT_STRUCT_OFFSET(struct kvm_smram_state_64, field, offset - 0xFE00)
++
++ __CHECK_SMRAM64_OFFSET(es, 0xFE00);
++ __CHECK_SMRAM64_OFFSET(cs, 0xFE10);
++ __CHECK_SMRAM64_OFFSET(ss, 0xFE20);
++ __CHECK_SMRAM64_OFFSET(ds, 0xFE30);
++ __CHECK_SMRAM64_OFFSET(fs, 0xFE40);
++ __CHECK_SMRAM64_OFFSET(gs, 0xFE50);
++ __CHECK_SMRAM64_OFFSET(gdtr, 0xFE60);
++ __CHECK_SMRAM64_OFFSET(ldtr, 0xFE70);
++ __CHECK_SMRAM64_OFFSET(idtr, 0xFE80);
++ __CHECK_SMRAM64_OFFSET(tr, 0xFE90);
++ __CHECK_SMRAM64_OFFSET(io_restart_rip, 0xFEA0);
++ __CHECK_SMRAM64_OFFSET(io_restart_rcx, 0xFEA8);
++ __CHECK_SMRAM64_OFFSET(io_restart_rsi, 0xFEB0);
++ __CHECK_SMRAM64_OFFSET(io_restart_rdi, 0xFEB8);
++ __CHECK_SMRAM64_OFFSET(io_restart_dword, 0xFEC0);
++ __CHECK_SMRAM64_OFFSET(reserved1, 0xFEC4);
++ __CHECK_SMRAM64_OFFSET(io_inst_restart, 0xFEC8);
++ __CHECK_SMRAM64_OFFSET(auto_hlt_restart, 0xFEC9);
++ __CHECK_SMRAM64_OFFSET(reserved2, 0xFECA);
++ __CHECK_SMRAM64_OFFSET(efer, 0xFED0);
++ __CHECK_SMRAM64_OFFSET(svm_guest_flag, 0xFED8);
++ __CHECK_SMRAM64_OFFSET(svm_guest_vmcb_gpa, 0xFEE0);
++ __CHECK_SMRAM64_OFFSET(svm_guest_virtual_int, 0xFEE8);
++ __CHECK_SMRAM64_OFFSET(reserved3, 0xFEF0);
++ __CHECK_SMRAM64_OFFSET(smm_revison, 0xFEFC);
++ __CHECK_SMRAM64_OFFSET(smbase, 0xFF00);
++ __CHECK_SMRAM64_OFFSET(reserved4, 0xFF04);
++ __CHECK_SMRAM64_OFFSET(ssp, 0xFF18);
++ __CHECK_SMRAM64_OFFSET(svm_guest_pat, 0xFF20);
++ __CHECK_SMRAM64_OFFSET(svm_host_efer, 0xFF28);
++ __CHECK_SMRAM64_OFFSET(svm_host_cr4, 0xFF30);
++ __CHECK_SMRAM64_OFFSET(svm_host_cr3, 0xFF38);
++ __CHECK_SMRAM64_OFFSET(svm_host_cr0, 0xFF40);
++ __CHECK_SMRAM64_OFFSET(cr4, 0xFF48);
++ __CHECK_SMRAM64_OFFSET(cr3, 0xFF50);
++ __CHECK_SMRAM64_OFFSET(cr0, 0xFF58);
++ __CHECK_SMRAM64_OFFSET(dr7, 0xFF60);
++ __CHECK_SMRAM64_OFFSET(dr6, 0xFF68);
++ __CHECK_SMRAM64_OFFSET(rflags, 0xFF70);
++ __CHECK_SMRAM64_OFFSET(rip, 0xFF78);
++ __CHECK_SMRAM64_OFFSET(gprs, 0xFF80);
++#undef __CHECK_SMRAM64_OFFSET
++}
++
++union kvm_smram {
++ struct kvm_smram_state_64 smram64;
++ struct kvm_smram_state_32 smram32;
++ u8 bytes[512];
++};
++
++void __init kvm_emulator_init(void);
++
++
+ /* Host execution mode. */
+ #if defined(CONFIG_X86_32)
+ #define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32
+diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
+index acca85b10545..20aec64e3521 100644
+--- a/arch/x86/kvm/x86.c
++++ b/arch/x86/kvm/x86.c
+@@ -13730,6 +13730,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_exit);
+ static int __init kvm_x86_init(void)
+ {
+ kvm_mmu_x86_module_init();
++ kvm_emulator_init();
+ return 0;
+ }
+ module_init(kvm_x86_init);
projects / pve-kernel.git / blobdiff