167 lines
4.8 KiB
Diff
167 lines
4.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Maxim Levitsky <mlevitsk@redhat.com>
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Date: Tue, 21 Jun 2022 18:08:58 +0300
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Subject: [PATCH] KVM: x86: emulator/smm: add structs for KVM's smram layout
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Those structs will be used to read/write the smram state image.
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Also document the differences between KVM's SMRAM layout and SMRAM
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layout that is used by real Intel/AMD cpus.
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Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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arch/x86/kvm/kvm_emulate.h | 139 +++++++++++++++++++++++++++++++++++++
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1 file changed, 139 insertions(+)
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diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
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index 8dff25d267b7..3bbf7c1c5b18 100644
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--- a/arch/x86/kvm/kvm_emulate.h
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+++ b/arch/x86/kvm/kvm_emulate.h
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@@ -481,6 +481,145 @@ enum x86_intercept {
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nr_x86_intercepts
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};
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+
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+/*
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+ * 32 bit KVM's emulated SMM layout
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+ * Loosely based on Intel's layout
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+ */
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+
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+struct kvm_smm_seg_state_32 {
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+ u32 flags;
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+ u32 limit;
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+ u32 base;
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+} __packed;
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+
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+struct kvm_smram_state_32 {
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+
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+ u32 reserved1[62]; /* FE00 - FEF7 */
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+ u32 smbase; /* FEF8 */
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+ u32 smm_revision; /* FEFC */
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+ u32 reserved2[5]; /* FF00-FF13 */
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+ /* CR4 is not present in Intel/AMD SMRAM image*/
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+ u32 cr4; /* FF14 */
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+ u32 reserved3[5]; /* FF18 */
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+
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+ /*
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+ * Segment state is not present/documented in the
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+ * Intel/AMD SMRAM image
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+ */
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+ struct kvm_smm_seg_state_32 ds; /* FF2C */
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+ struct kvm_smm_seg_state_32 fs; /* FF38 */
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+ struct kvm_smm_seg_state_32 gs; /* FF44 */
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+ /* idtr has only base and limit*/
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+ struct kvm_smm_seg_state_32 idtr; /* FF50 */
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+ struct kvm_smm_seg_state_32 tr; /* FF5C */
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+ u32 reserved; /* FF68 */
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+ /* gdtr has only base and limit*/
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+ struct kvm_smm_seg_state_32 gdtr; /* FF6C */
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+ struct kvm_smm_seg_state_32 ldtr; /* FF78 */
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+ struct kvm_smm_seg_state_32 es; /* FF84 */
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+ struct kvm_smm_seg_state_32 cs; /* FF90 */
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+ struct kvm_smm_seg_state_32 ss; /* FF9C */
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+
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+ u32 es_sel; /* FFA8 */
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+ u32 cs_sel; /* FFAC */
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+ u32 ss_sel; /* FFB0 */
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+ u32 ds_sel; /* FFB4 */
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+ u32 fs_sel; /* FFB8 */
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+ u32 gs_sel; /* FFBC */
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+ u32 ldtr_sel; /* FFC0 */
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+ u32 tr_sel; /* FFC4 */
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+
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+ u32 dr7; /* FFC8 */
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+ u32 dr6; /* FFCC */
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+
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+ /* GPRS in the "natural" X86 order (RAX/RCX/RDX.../RDI)*/
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+ u32 gprs[8]; /* FFD0-FFEC */
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+
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+ u32 eip; /* FFF0 */
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+ u32 eflags; /* FFF4 */
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+ u32 cr3; /* FFF8 */
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+ u32 cr0; /* FFFC */
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+} __packed;
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+
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+/*
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+ * 64 bit KVM's emulated SMM layout
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+ * Based on AMD64 layout
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+ */
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+
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+struct kvm_smm_seg_state_64 {
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+ u16 selector;
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+ u16 attributes;
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+ u32 limit;
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+ u64 base;
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+};
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+
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+struct kvm_smram_state_64 {
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+ struct kvm_smm_seg_state_64 es; /* FE00 (R/O) */
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+ struct kvm_smm_seg_state_64 cs; /* FE10 (R/O) */
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+ struct kvm_smm_seg_state_64 ss; /* FE20 (R/O) */
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+ struct kvm_smm_seg_state_64 ds; /* FE30 (R/O) */
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+ struct kvm_smm_seg_state_64 fs; /* FE40 (R/O) */
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+ struct kvm_smm_seg_state_64 gs; /* FE50 (R/O) */
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+
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+ /* gdtr has only base and limit*/
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+ struct kvm_smm_seg_state_64 gdtr; /* FE60 (R/O) */
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+ struct kvm_smm_seg_state_64 ldtr; /* FE70 (R/O) */
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+
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+ /* idtr has only base and limit*/
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+ struct kvm_smm_seg_state_64 idtr; /* FE80 (R/O) */
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+ struct kvm_smm_seg_state_64 tr; /* FE90 (R/O) */
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+
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+ /* I/O restart and auto halt restart are not implemented by KVM */
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+ u64 io_restart_rip; /* FEA0 (R/O) */
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+ u64 io_restart_rcx; /* FEA8 (R/O) */
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+ u64 io_restart_rsi; /* FEB0 (R/O) */
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+ u64 io_restart_rdi; /* FEB8 (R/O) */
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+ u32 io_restart_dword; /* FEC0 (R/O) */
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+ u32 reserved1; /* FEC4 */
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+ u8 io_instruction_restart; /* FEC8 (R/W) */
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+ u8 auto_halt_restart; /* FEC9 (R/W) */
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+ u8 reserved2[6]; /* FECA-FECF */
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+
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+ u64 efer; /* FED0 (R/O) */
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+
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+ /*
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+ * Implemented on AMD only, to store current SVM guest address.
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+ * svm_guest_virtual_int has unknown purpose, not implemented.
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+ */
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+
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+ u64 svm_guest_flag; /* FED8 (R/O) */
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+ u64 svm_guest_vmcb_gpa; /* FEE0 (R/O) */
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+ u64 svm_guest_virtual_int; /* FEE8 (R/O) */
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+
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+ u32 reserved3[3]; /* FEF0-FEFB */
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+ u32 smm_revison; /* FEFC (R/O) */
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+ u32 smbase; /* FFF0 (R/W) */
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+ u32 reserved4[5]; /* FF04-FF17 */
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+
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+ /* SSP and SVM fields below are not implemented by KVM */
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+ u64 ssp; /* FF18 (R/W) */
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+ u64 svm_guest_pat; /* FF20 (R/O) */
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+ u64 svm_host_efer; /* FF28 (R/O) */
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+ u64 svm_host_cr4; /* FF30 (R/O) */
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+ u64 svm_host_cr3; /* FF38 (R/O) */
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+ u64 svm_host_cr0; /* FF40 (R/O) */
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+
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+ u64 cr4; /* FF48 (R/O) */
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+ u64 cr3; /* FF50 (R/O) */
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+ u64 cr0; /* FF58 (R/O) */
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+
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+ u64 dr7; /* FF60 (R/O) */
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+ u64 dr6; /* FF68 (R/O) */
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+
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+ u64 rflags; /* FF70 (R/W) */
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+ u64 rip; /* FF78 (R/W) */
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+
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+ /* GPRS in a reversed "natural" X86 order (R15/R14/../RCX/RAX.) */
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+ u64 gprs[16]; /* FF80-FFFF (R/W) */
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+};
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+
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+
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/* Host execution mode. */
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#if defined(CONFIG_X86_32)
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#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32
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