From: Avi Kivity <avi@qumranet.com>
To: linux-kernel@vger.kernel.org, kvm-devel@lists.sourceforge.net
Subject: [PATCH 18/54] KVM: x86 emulator: unify four switch statements into two
Date: Tue, 1 Jan 2008 17:35:44 +0200 [thread overview]
Message-ID: <1199201780-14001-19-git-send-email-avi@qumranet.com> (raw)
In-Reply-To: <1199201780-14001-1-git-send-email-avi@qumranet.com>
Unify the special instruction switch with the regular instruction switch,
and the two byte special instruction switch with the regular two byte
instruction switch. That makes it much easier to find an instruction or
the place an instruction needs to be added in.
Signed-off-by: Avi Kivity <avi@qumranet.com>
---
drivers/kvm/x86_emulate.c | 342 ++++++++++++++++++++++-----------------------
1 files changed, 168 insertions(+), 174 deletions(-)
diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 499d1ad..3e3eba7 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -1294,6 +1294,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
}
c->dst.orig_val = c->dst.val;
+special_insn:
+
if (c->twobyte)
goto twobyte_insn;
@@ -1378,6 +1380,52 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
goto cannot_emulate;
c->dst.val = (s32) c->src.val;
break;
+ case 0x6a: /* push imm8 */
+ c->src.val = 0L;
+ c->src.val = insn_fetch(s8, 1, c->eip);
+ emulate_push(ctxt);
+ break;
+ case 0x6c: /* insb */
+ case 0x6d: /* insw/insd */
+ if (kvm_emulate_pio_string(ctxt->vcpu, NULL,
+ 1,
+ (c->d & ByteOp) ? 1 : c->op_bytes,
+ c->rep_prefix ?
+ address_mask(c->regs[VCPU_REGS_RCX]) : 1,
+ (ctxt->eflags & EFLG_DF),
+ register_address(ctxt->es_base,
+ c->regs[VCPU_REGS_RDI]),
+ c->rep_prefix,
+ c->regs[VCPU_REGS_RDX]) == 0) {
+ c->eip = saved_eip;
+ return -1;
+ }
+ return 0;
+ case 0x6e: /* outsb */
+ case 0x6f: /* outsw/outsd */
+ if (kvm_emulate_pio_string(ctxt->vcpu, NULL,
+ 0,
+ (c->d & ByteOp) ? 1 : c->op_bytes,
+ c->rep_prefix ?
+ address_mask(c->regs[VCPU_REGS_RCX]) : 1,
+ (ctxt->eflags & EFLG_DF),
+ register_address(c->override_base ?
+ *c->override_base :
+ ctxt->ds_base,
+ c->regs[VCPU_REGS_RSI]),
+ c->rep_prefix,
+ c->regs[VCPU_REGS_RDX]) == 0) {
+ c->eip = saved_eip;
+ return -1;
+ }
+ return 0;
+ case 0x70 ... 0x7f: /* jcc (short) */ {
+ int rel = insn_fetch(s8, 1, c->eip);
+
+ if (test_cc(c->b, ctxt->eflags))
+ JMP_REL(rel);
+ break;
+ }
case 0x80 ... 0x83: /* Grp1 */
switch (c->modrm_reg) {
case 0:
@@ -1434,106 +1482,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
if (rc != 0)
goto done;
break;
- case 0xa0 ... 0xa1: /* mov */
- c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
- c->dst.val = c->src.val;
- break;
- case 0xa2 ... 0xa3: /* mov */
- c->dst.val = (unsigned long)c->regs[VCPU_REGS_RAX];
- break;
- case 0xc0 ... 0xc1:
- emulate_grp2(ctxt);
- break;
- case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */
- mov:
- c->dst.val = c->src.val;
- break;
- case 0xd0 ... 0xd1: /* Grp2 */
- c->src.val = 1;
- emulate_grp2(ctxt);
- break;
- case 0xd2 ... 0xd3: /* Grp2 */
- c->src.val = c->regs[VCPU_REGS_RCX];
- emulate_grp2(ctxt);
- break;
- case 0xf6 ... 0xf7: /* Grp3 */
- rc = emulate_grp3(ctxt, ops);
- if (rc != 0)
- goto done;
- break;
- case 0xfe ... 0xff: /* Grp4/Grp5 */
- rc = emulate_grp45(ctxt, ops);
- if (rc != 0)
- goto done;
- break;
- }
-
-writeback:
- rc = writeback(ctxt, ops);
- if (rc != 0)
- goto done;
-
- /* Commit shadow register state. */
- memcpy(ctxt->vcpu->regs, c->regs, sizeof c->regs);
- ctxt->vcpu->rip = c->eip;
-
-done:
- if (rc == X86EMUL_UNHANDLEABLE) {
- c->eip = saved_eip;
- return -1;
- }
- return 0;
-
-special_insn:
- if (c->twobyte)
- goto twobyte_special_insn;
- switch (c->b) {
- case 0x6a: /* push imm8 */
- c->src.val = 0L;
- c->src.val = insn_fetch(s8, 1, c->eip);
- emulate_push(ctxt);
- break;
- case 0x6c: /* insb */
- case 0x6d: /* insw/insd */
- if (kvm_emulate_pio_string(ctxt->vcpu, NULL,
- 1,
- (c->d & ByteOp) ? 1 : c->op_bytes,
- c->rep_prefix ?
- address_mask(c->regs[VCPU_REGS_RCX]) : 1,
- (ctxt->eflags & EFLG_DF),
- register_address(ctxt->es_base,
- c->regs[VCPU_REGS_RDI]),
- c->rep_prefix,
- c->regs[VCPU_REGS_RDX]) == 0) {
- c->eip = saved_eip;
- return -1;
- }
- return 0;
- case 0x6e: /* outsb */
- case 0x6f: /* outsw/outsd */
- if (kvm_emulate_pio_string(ctxt->vcpu, NULL,
- 0,
- (c->d & ByteOp) ? 1 : c->op_bytes,
- c->rep_prefix ?
- address_mask(c->regs[VCPU_REGS_RCX]) : 1,
- (ctxt->eflags & EFLG_DF),
- register_address(c->override_base ?
- *c->override_base :
- ctxt->ds_base,
- c->regs[VCPU_REGS_RSI]),
- c->rep_prefix,
- c->regs[VCPU_REGS_RDX]) == 0) {
- c->eip = saved_eip;
- return -1;
- }
- return 0;
- case 0x70 ... 0x7f: /* jcc (short) */ {
- int rel = insn_fetch(s8, 1, c->eip);
-
- if (test_cc(c->b, ctxt->eflags))
- JMP_REL(rel);
- break;
- }
case 0x9c: /* pushf */
c->src.val = (unsigned long) ctxt->eflags;
emulate_push(ctxt);
@@ -1541,6 +1489,13 @@ special_insn:
case 0x9d: /* popf */
c->dst.ptr = (unsigned long *) &ctxt->eflags;
goto pop_instruction;
+ case 0xa0 ... 0xa1: /* mov */
+ c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
+ c->dst.val = c->src.val;
+ break;
+ case 0xa2 ... 0xa3: /* mov */
+ c->dst.val = (unsigned long)c->regs[VCPU_REGS_RAX];
+ break;
case 0xa4 ... 0xa5: /* movs */
c->dst.type = OP_MEM;
c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
@@ -1627,9 +1582,24 @@ special_insn:
case 0xae ... 0xaf: /* scas */
DPRINTF("Urk! I don't handle SCAS.\n");
goto cannot_emulate;
+ case 0xc0 ... 0xc1:
+ emulate_grp2(ctxt);
+ break;
case 0xc3: /* ret */
c->dst.ptr = &c->eip;
goto pop_instruction;
+ case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */
+ mov:
+ c->dst.val = c->src.val;
+ break;
+ case 0xd0 ... 0xd1: /* Grp2 */
+ c->src.val = 1;
+ emulate_grp2(ctxt);
+ break;
+ case 0xd2 ... 0xd3: /* Grp2 */
+ c->src.val = c->regs[VCPU_REGS_RCX];
+ emulate_grp2(ctxt);
+ break;
case 0xe8: /* call (near) */ {
long int rel;
switch (c->op_bytes) {
@@ -1662,6 +1632,11 @@ special_insn:
ctxt->eflags ^= EFLG_CF;
c->dst.type = OP_NONE; /* Disable writeback. */
break;
+ case 0xf6 ... 0xf7: /* Grp3 */
+ rc = emulate_grp3(ctxt, ops);
+ if (rc != 0)
+ goto done;
+ break;
case 0xf8: /* clc */
ctxt->eflags &= ~EFLG_CF;
c->dst.type = OP_NONE; /* Disable writeback. */
@@ -1674,8 +1649,28 @@ special_insn:
ctxt->eflags |= X86_EFLAGS_IF;
c->dst.type = OP_NONE; /* Disable writeback. */
break;
+ case 0xfe ... 0xff: /* Grp4/Grp5 */
+ rc = emulate_grp45(ctxt, ops);
+ if (rc != 0)
+ goto done;
+ break;
}
- goto writeback;
+
+writeback:
+ rc = writeback(ctxt, ops);
+ if (rc != 0)
+ goto done;
+
+ /* Commit shadow register state. */
+ memcpy(ctxt->vcpu->regs, c->regs, sizeof c->regs);
+ ctxt->vcpu->rip = c->eip;
+
+done:
+ if (rc == X86EMUL_UNHANDLEABLE) {
+ c->eip = saved_eip;
+ return -1;
+ }
+ return 0;
twobyte_insn:
switch (c->b) {
@@ -1737,6 +1732,23 @@ twobyte_insn:
/* Disable writeback. */
c->dst.type = OP_NONE;
break;
+ case 0x06:
+ emulate_clts(ctxt->vcpu);
+ c->dst.type = OP_NONE;
+ break;
+ case 0x08: /* invd */
+ case 0x09: /* wbinvd */
+ case 0x0d: /* GrpP (prefetch) */
+ case 0x18: /* Grp16 (prefetch/nop) */
+ c->dst.type = OP_NONE;
+ break;
+ case 0x20: /* mov cr, reg */
+ if (c->modrm_mod != 3)
+ goto cannot_emulate;
+ c->regs[c->modrm_rm] =
+ realmode_get_cr(ctxt->vcpu, c->modrm_reg);
+ c->dst.type = OP_NONE; /* no writeback */
+ break;
case 0x21: /* mov from dr to reg */
if (c->modrm_mod != 3)
goto cannot_emulate;
@@ -1745,6 +1757,13 @@ twobyte_insn:
goto cannot_emulate;
c->dst.type = OP_NONE; /* no writeback */
break;
+ case 0x22: /* mov reg, cr */
+ if (c->modrm_mod != 3)
+ goto cannot_emulate;
+ realmode_set_cr(ctxt->vcpu,
+ c->modrm_reg, c->modrm_val, &ctxt->eflags);
+ c->dst.type = OP_NONE;
+ break;
case 0x23: /* mov from reg to dr */
if (c->modrm_mod != 3)
goto cannot_emulate;
@@ -1754,11 +1773,58 @@ twobyte_insn:
goto cannot_emulate;
c->dst.type = OP_NONE; /* no writeback */
break;
+ case 0x30:
+ /* wrmsr */
+ msr_data = (u32)c->regs[VCPU_REGS_RAX]
+ | ((u64)c->regs[VCPU_REGS_RDX] << 32);
+ rc = kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data);
+ if (rc) {
+ kvm_x86_ops->inject_gp(ctxt->vcpu, 0);
+ c->eip = ctxt->vcpu->rip;
+ }
+ rc = X86EMUL_CONTINUE;
+ c->dst.type = OP_NONE;
+ break;
+ case 0x32:
+ /* rdmsr */
+ rc = kvm_get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data);
+ if (rc) {
+ kvm_x86_ops->inject_gp(ctxt->vcpu, 0);
+ c->eip = ctxt->vcpu->rip;
+ } else {
+ c->regs[VCPU_REGS_RAX] = (u32)msr_data;
+ c->regs[VCPU_REGS_RDX] = msr_data >> 32;
+ }
+ rc = X86EMUL_CONTINUE;
+ c->dst.type = OP_NONE;
+ break;
case 0x40 ... 0x4f: /* cmov */
c->dst.val = c->dst.orig_val = c->src.val;
if (!test_cc(c->b, ctxt->eflags))
c->dst.type = OP_NONE; /* no writeback */
break;
+ case 0x80 ... 0x8f: /* jnz rel, etc*/ {
+ long int rel;
+
+ switch (c->op_bytes) {
+ case 2:
+ rel = insn_fetch(s16, 2, c->eip);
+ break;
+ case 4:
+ rel = insn_fetch(s32, 4, c->eip);
+ break;
+ case 8:
+ rel = insn_fetch(s64, 8, c->eip);
+ break;
+ default:
+ DPRINTF("jnz: Invalid op_bytes\n");
+ goto cannot_emulate;
+ }
+ if (test_cc(c->b, ctxt->eflags))
+ JMP_REL(rel);
+ c->dst.type = OP_NONE;
+ break;
+ }
case 0xa3:
bt: /* bt */
c->dst.type = OP_NONE;
@@ -1828,85 +1894,13 @@ twobyte_insn:
c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val :
(u64) c->src.val;
break;
- }
- goto writeback;
-
-twobyte_special_insn:
- switch (c->b) {
- case 0x06:
- emulate_clts(ctxt->vcpu);
- break;
- case 0x08: /* invd */
- break;
- case 0x09: /* wbinvd */
- break;
- case 0x0d: /* GrpP (prefetch) */
- case 0x18: /* Grp16 (prefetch/nop) */
- break;
- case 0x20: /* mov cr, reg */
- if (c->modrm_mod != 3)
- goto cannot_emulate;
- c->regs[c->modrm_rm] =
- realmode_get_cr(ctxt->vcpu, c->modrm_reg);
- break;
- case 0x22: /* mov reg, cr */
- if (c->modrm_mod != 3)
- goto cannot_emulate;
- realmode_set_cr(ctxt->vcpu,
- c->modrm_reg, c->modrm_val, &ctxt->eflags);
- break;
- case 0x30:
- /* wrmsr */
- msr_data = (u32)c->regs[VCPU_REGS_RAX]
- | ((u64)c->regs[VCPU_REGS_RDX] << 32);
- rc = kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data);
- if (rc) {
- kvm_x86_ops->inject_gp(ctxt->vcpu, 0);
- c->eip = ctxt->vcpu->rip;
- }
- rc = X86EMUL_CONTINUE;
- break;
- case 0x32:
- /* rdmsr */
- rc = kvm_get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data);
- if (rc) {
- kvm_x86_ops->inject_gp(ctxt->vcpu, 0);
- c->eip = ctxt->vcpu->rip;
- } else {
- c->regs[VCPU_REGS_RAX] = (u32)msr_data;
- c->regs[VCPU_REGS_RDX] = msr_data >> 32;
- }
- rc = X86EMUL_CONTINUE;
- break;
- case 0x80 ... 0x8f: /* jnz rel, etc*/ {
- long int rel;
-
- switch (c->op_bytes) {
- case 2:
- rel = insn_fetch(s16, 2, c->eip);
- break;
- case 4:
- rel = insn_fetch(s32, 4, c->eip);
- break;
- case 8:
- rel = insn_fetch(s64, 8, c->eip);
- break;
- default:
- DPRINTF("jnz: Invalid op_bytes\n");
- goto cannot_emulate;
- }
- if (test_cc(c->b, ctxt->eflags))
- JMP_REL(rel);
- break;
- }
case 0xc7: /* Grp9 (cmpxchg8b) */
rc = emulate_grp9(ctxt, ops, memop);
if (rc != 0)
goto done;
+ c->dst.type = OP_NONE;
break;
}
- /* Disable writeback. */
- c->dst.type = OP_NONE;
goto writeback;
cannot_emulate:
--
1.5.3.7
next prev parent reply other threads:[~2008-01-01 15:54 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-01 15:35 [PATCH 00/54] KVM patch queue review for 2.6.25 merge window (part IV) Avi Kivity
2008-01-01 15:35 ` [PATCH 01/54] KVM: MMU: Remove gva_to_hpa() Avi Kivity
2008-01-01 15:35 ` [PATCH 02/54] KVM: Remove gpa_to_hpa() Avi Kivity
2008-01-01 15:35 ` [PATCH 03/54] KVM: MMU: Rename variables of type 'struct kvm_mmu_page *' Avi Kivity
2008-01-01 15:35 ` [PATCH 04/54] KVM: MMU: Rename 'release_page' Avi Kivity
2008-01-01 15:35 ` [PATCH 05/54] KVM: Disallow fork() and similar games when using a VM Avi Kivity
2008-01-01 15:35 ` [PATCH 06/54] KVM: Enhance guest cpuid management Avi Kivity
2008-01-01 15:35 ` [PATCH 07/54] KVM: VMX: Remove the secondary execute control dependency on irqchip Avi Kivity
2008-01-01 15:35 ` [PATCH 08/54] KVM: Portability: Move unalias_gfn to arch dependent file Avi Kivity
2008-01-01 15:35 ` [PATCH 09/54] KVM: x86 emulator: Make a distinction between repeat prefixes F3 and F2 Avi Kivity
2008-01-01 15:35 ` [PATCH 10/54] KVM: x86 emulator: address size and operand size overrides are sticky Avi Kivity
2008-01-01 15:35 ` [PATCH 11/54] KVM: Remove misleading check for mmio during event injection Avi Kivity
2008-01-01 15:35 ` [PATCH 12/54] KVM: MMU: mark pages that were inserted to the shadow pages table as accessed Avi Kivity
2008-01-01 15:35 ` [PATCH 13/54] KVM: x86 emulator: Rename 'cr2' to 'memop' Avi Kivity
2008-01-01 15:35 ` [PATCH 14/54] KVM: x86 emulator: cmps instruction Avi Kivity
2008-01-01 15:35 ` [PATCH 15/54] KVM: Add ifdef in irqchip struct for x86 only structures Avi Kivity
2008-01-01 15:35 ` [PATCH 16/54] KVM: x86 emulator: Move rep processing before instruction execution Avi Kivity
2008-01-01 15:35 ` [PATCH 17/54] KVM: x86 emulator: unify two switches Avi Kivity
2008-01-01 15:35 ` Avi Kivity [this message]
2008-01-01 15:35 ` [PATCH 19/54] KVM: Portability: Move KVM_INTERRUPT vcpu ioctl to x86.c Avi Kivity
2008-01-01 15:35 ` [PATCH 20/54] KVM: Correct kvm_init() error paths not freeing bad_pge Avi Kivity
2008-01-01 15:35 ` [PATCH 21/54] KVM: Export include/linux/kvm.h only if $ARCH actually supports KVM Avi Kivity
2008-01-01 16:22 ` Sam Ravnborg
2008-01-01 16:35 ` Avi Kivity
2008-01-01 15:35 ` [PATCH 22/54] KVM: SVM: Remove KVM specific defines for MSR_EFER Avi Kivity
2008-01-01 15:35 ` [PATCH 23/54] KVM: Replace kvm_lapic with kvm_vcpu in ioapic/lapic interface Avi Kivity
2008-01-01 15:35 ` [PATCH 24/54] KVM: Replace dest_Lowest_Prio and dest_Fixed with self-defined macros Avi Kivity
2008-01-01 15:35 ` [PATCH 25/54] KVM: Extend ioapic code to support iosapic Avi Kivity
2008-01-01 15:35 ` [PATCH 26/54] KVM: Portability: Move address types to their own header file Avi Kivity
2008-01-01 15:35 ` [PATCH 27/54] KVM: Portability: Move IO device definitions to its " Avi Kivity
2008-01-01 15:35 ` [PATCH 28/54] KVM: Portability: Stop including x86-specific headers in kvm_main.c Avi Kivity
2008-01-01 15:35 ` [PATCH 29/54] KVM: Portability: Create kvm_arch_vcpu_runnable() function Avi Kivity
2008-01-01 15:35 ` [PATCH 30/54] KVM: Convert KVM from ->nopage() to ->fault() Avi Kivity
2008-01-01 15:35 ` [PATCH 31/54] KVM: MMU: Remove unused prev_shadow_ent variable from fetch() Avi Kivity
2008-01-01 15:35 ` [PATCH 32/54] KVM: Generalize exception injection mechanism Avi Kivity
2008-01-01 15:35 ` [PATCH 33/54] KVM: Replace page fault injection by the generalized exception queue Avi Kivity
2008-01-01 15:36 ` [PATCH 34/54] KVM: Replace #GP " Avi Kivity
2008-01-01 15:36 ` [PATCH 35/54] KVM: Use generalized exception queue for injecting #UD Avi Kivity
2008-01-01 15:36 ` [PATCH 36/54] KVM: x86 emulator: fix eflags preparation for emulation Avi Kivity
2008-01-01 15:36 ` [PATCH 37/54] KVM: VMX: Avoid exit when setting cr8 if the local apic is in the kernel Avi Kivity
2008-01-01 15:36 ` [PATCH 38/54] KVM: SVM: Emulate read/write access to cr8 Avi Kivity
2008-01-01 15:36 ` [PATCH 39/54] KVM: x86 emulator: Fix stack instructions on 64-bit mode Avi Kivity
2008-01-01 15:36 ` [PATCH 40/54] KVM: SVM: Trap access to the cr8 register Avi Kivity
2008-01-01 15:36 ` [PATCH 41/54] KVM: MMU: Use cmpxchg for pte updates on walk_addr() Avi Kivity
2008-01-01 15:36 ` [PATCH 42/54] KVM: MMU: Simplify calculation of pte access Avi Kivity
2008-01-01 15:36 ` [PATCH 43/54] KVM: MMU: Set nx bit correctly on shadow ptes Avi Kivity
2008-01-01 15:36 ` [PATCH 44/54] KVM: MMU: Move pte access calculation into a helper function Avi Kivity
2008-01-01 15:36 ` [PATCH 45/54] KVM: MMU: Fix inherited permissions for emulated guest pte updates Avi Kivity
2008-01-01 15:36 ` [PATCH 46/54] KVM: MMU: No need to pick up nx bit from guest pte Avi Kivity
2008-01-01 15:36 ` [PATCH 47/54] KVM: MMU: Pass pte dirty flag to set_pte() instead of calculating it on-site Avi Kivity
2008-01-01 15:36 ` [PATCH 48/54] KVM: MMU: Remove walker argument to set_pte() Avi Kivity
2008-01-01 15:36 ` [PATCH 49/54] KVM: MMU: Move set_pte() into guest paging mode independent code Avi Kivity
2008-01-01 15:36 ` [PATCH 50/54] KVM: MMU: Adjust mmu_set_spte() debug code for gpte removal Avi Kivity
2008-01-01 15:36 ` [PATCH 51/54] KVM: MMU: Use mmu_set_spte() for real-mode shadows Avi Kivity
2008-01-01 15:36 ` [PATCH 52/54] KVM: SVM: Exit to userspace if write to cr8 and not using in-kernel apic Avi Kivity
2008-01-01 15:36 ` [PATCH 53/54] KVM: MMU: Fix SMP shadow instantiation race Avi Kivity
2008-01-01 15:36 ` [PATCH 54/54] KVM: LAPIC: minor debugging compile fix Avi Kivity
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