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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] x86/svm: adjust VM entry/exit code
Move saving of rAX into assembly code, to match its restoration. Simplify
assembly code, at once reducing the delta between 32- and 64-bit variants.
Eliminate save_svm_cpu_user_regs() - as on VMX all consumers are required
to call hvm_store_cpu_guest_regs().
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Index: 2007-05-14/xen/arch/x86/hvm/svm/svm.c
===================================================================
--- 2007-05-14.orig/xen/arch/x86/hvm/svm/svm.c 2007-05-14 14:28:19.000000000
+0200
+++ 2007-05-14/xen/arch/x86/hvm/svm/svm.c 2007-05-14 14:33:08.000000000
+0200
@@ -747,28 +747,10 @@ static void svm_init_hypercall_page(stru
*(u16 *)(hypercall_page + (__HYPERVISOR_iret * 32)) = 0x0b0f; /* ud2 */
}
-static void save_svm_cpu_user_regs(struct vcpu *v, struct cpu_user_regs *ctxt)
-{
- struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
-
- ctxt->eax = vmcb->rax;
- ctxt->ss = vmcb->ss.sel;
- ctxt->esp = vmcb->rsp;
- ctxt->eflags = vmcb->rflags;
- ctxt->cs = vmcb->cs.sel;
- ctxt->eip = vmcb->rip;
-
- ctxt->gs = vmcb->gs.sel;
- ctxt->fs = vmcb->fs.sel;
- ctxt->es = vmcb->es.sel;
- ctxt->ds = vmcb->ds.sel;
-}
-
static void svm_load_cpu_guest_regs(struct vcpu *v, struct cpu_user_regs *regs)
{
struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
- vmcb->rax = regs->eax;
vmcb->ss.sel = regs->ss;
vmcb->rsp = regs->esp;
vmcb->rflags = regs->eflags | 2UL;
@@ -1408,7 +1390,7 @@ static void svm_io_instruction(struct vc
/* Copy current guest state into io instruction state structure. */
memcpy(regs, guest_cpu_user_regs(), HVM_CONTEXT_STACK_BYTES);
- hvm_store_cpu_guest_regs(v, regs, NULL);
+ svm_store_cpu_guest_regs(v, regs, NULL);
info.bytes = vmcb->exitinfo1;
@@ -2236,7 +2218,6 @@ asmlinkage void svm_vmexit_handler(struc
int inst_len, rc;
exit_reason = vmcb->exitcode;
- save_svm_cpu_user_regs(v, regs);
HVMTRACE_2D(VMEXIT, v, vmcb->rip, exit_reason);
Index: 2007-05-14/xen/arch/x86/hvm/svm/x86_32/exits.S
===================================================================
--- 2007-05-14.orig/xen/arch/x86/hvm/svm/x86_32/exits.S 2007-04-23
10:01:41.000000000 +0200
+++ 2007-05-14/xen/arch/x86/hvm/svm/x86_32/exits.S 2007-05-14
14:33:08.000000000 +0200
@@ -61,8 +61,11 @@
#define HVM_SAVE_ALL_NOSEGREGS \
pushl $HVM_MONITOR_EFLAGS; \
popf; \
- subl $(NR_SKIPPED_REGS*4), %esp; \
- pushl %eax; \
+ /* \
+ * Skip %eax, we need have vmcb address in there. \
+ * Don't worry, EAX is saved during #VMEXIT. \
+ */ \
+ subl $4+(NR_SKIPPED_REGS*4), %esp; \
pushl %ebp; \
pushl %edi; \
pushl %esi; \
@@ -77,8 +80,11 @@
popl %esi; \
popl %edi; \
popl %ebp; \
- popl %eax; \
- addl $(NR_SKIPPED_REGS*4), %esp
+ /* \
+ * Skip %eax, we need to have vmcb address in there. \
+ * Don't worry, EAX is restored through the VMRUN instruction. \
+ */ \
+ addl $4+(NR_SKIPPED_REGS*4), %esp
#define VMRUN .byte 0x0F,0x01,0xD8
#define VMLOAD .byte 0x0F,0x01,0xDA
@@ -88,63 +94,53 @@
ENTRY(svm_asm_do_resume)
GET_CURRENT(%ebx)
- xorl %ecx,%ecx
- notl %ecx
+.Lresume:
cli # tests must not race interrupts
movl VCPU_processor(%ebx),%eax
shl $IRQSTAT_shift,%eax
- test %ecx,irq_stat(%eax,1)
- jnz svm_process_softirqs
+ cmpl $0,irq_stat(%eax)
+ jne svm_process_softirqs
call svm_intr_assist
call svm_load_cr2
CLGI
sti
- GET_CURRENT(%ebx)
movl VCPU_svm_vmcb(%ebx), %ecx
- movl 24(%esp), %eax
+ movl UREGS_eax(%esp), %eax
+ movl VCPU_processor(%ebx), %edx
movl %eax, VMCB_rax(%ecx)
- movl VCPU_processor(%ebx), %eax
- movl root_vmcb_pa(,%eax,8), %eax
+ movl root_vmcb_pa(,%edx,8), %eax
VMSAVE
movl VCPU_svm_vmcb_pa(%ebx), %eax
- popl %ebx
- popl %ecx
- popl %edx
- popl %esi
- popl %edi
- popl %ebp
-
- /*
- * Skip %eax, we need to have vmcb address in there.
- * Don't worry, EAX is restored through the VMRUN instruction.
- */
- addl $4, %esp
- addl $(NR_SKIPPED_REGS*4), %esp
+ HVM_RESTORE_ALL_NOSEGREGS
+
VMLOAD
VMRUN
VMSAVE
- /* eax is the only register we're allowed to touch here... */
- GET_CURRENT(%eax)
+ HVM_SAVE_ALL_NOSEGREGS
- movl VCPU_processor(%eax), %eax
- movl root_vmcb_pa(,%eax,8), %eax
+ GET_CURRENT(%ebx)
+ movl VCPU_processor(%ebx), %ecx
+ movl VCPU_svm_vmcb(%ebx), %edx
+ movl root_vmcb_pa(,%ecx,8), %eax
VMLOAD
+ movl VMCB_rax(%edx), %eax
- HVM_SAVE_ALL_NOSEGREGS
STGI
.globl svm_stgi_label;
svm_stgi_label:
+
+ movl %eax, UREGS_eax(%esp)
movl %esp,%eax
push %eax
call svm_vmexit_handler
addl $4,%esp
- jmp svm_asm_do_resume
+ jmp .Lresume
ALIGN
svm_process_softirqs:
sti
call do_softirq
- jmp svm_asm_do_resume
+ jmp .Lresume
Index: 2007-05-14/xen/arch/x86/hvm/svm/x86_64/exits.S
===================================================================
--- 2007-05-14.orig/xen/arch/x86/hvm/svm/x86_64/exits.S 2007-04-23
10:01:41.000000000 +0200
+++ 2007-05-14/xen/arch/x86/hvm/svm/x86_64/exits.S 2007-05-14
14:33:08.000000000 +0200
@@ -85,7 +85,11 @@
popq %r10; \
popq %r9; \
popq %r8; \
- popq %rax; \
+ /* \
+ * Discard %rax, we need to have vmcb address in there. \
+ * Don't worry, RAX is restored through the VMRUN instruction. \
+ */ \
+ addq $8, %rsp; \
popq %rcx; \
popq %rdx; \
popq %rsi; \
@@ -100,68 +104,54 @@
ENTRY(svm_asm_do_resume)
GET_CURRENT(%rbx)
+.Lresume:
cli # tests must not race interrupts
movl VCPU_processor(%rbx),%eax
shl $IRQSTAT_shift, %rax
leaq irq_stat(%rip), %rdx
- testl $~0, (%rdx, %rax, 1)
- jnz svm_process_softirqs
+ cmpl $0, (%rdx, %rax)
+ jne svm_process_softirqs
call svm_intr_assist
call svm_load_cr2
CLGI
sti
- GET_CURRENT(%rbx)
movq VCPU_svm_vmcb(%rbx), %rcx
movq UREGS_rax(%rsp), %rax
+ movl VCPU_processor(%rbx), %edx
movq %rax, VMCB_rax(%rcx)
leaq root_vmcb_pa(%rip), %rax
- movl VCPU_processor(%rbx), %ecx
- movq (%rax,%rcx,8), %rax
+ movq (%rax,%rdx,8), %rax
VMSAVE
movq VCPU_svm_vmcb_pa(%rbx), %rax
- popq %r15
- popq %r14
- popq %r13
- popq %r12
- popq %rbp
- popq %rbx
- popq %r11
- popq %r10
- popq %r9
- popq %r8
- /*
- * Skip %rax, we need to have vmcb address in there.
- * Don't worry, RAX is restored through the VMRUN instruction.
- */
- addq $8, %rsp
- popq %rcx
- popq %rdx
- popq %rsi
- popq %rdi
- addq $(NR_SKIPPED_REGS*8), %rsp
+ HVM_RESTORE_ALL_NOSEGREGS
VMLOAD
VMRUN
VMSAVE
+
HVM_SAVE_ALL_NOSEGREGS
GET_CURRENT(%rbx)
- leaq root_vmcb_pa(%rip), %rax
movl VCPU_processor(%rbx), %ecx
+ leaq root_vmcb_pa(%rip), %rax
+ movq VCPU_svm_vmcb(%rbx), %rdx
movq (%rax,%rcx,8), %rax
VMLOAD
+ movq VMCB_rax(%rdx), %rax
STGI
.globl svm_stgi_label;
svm_stgi_label:
+
+ movq %rax, UREGS_rax(%rsp)
movq %rsp,%rdi
call svm_vmexit_handler
- jmp svm_asm_do_resume
+ jmp .Lresume
ALIGN
svm_process_softirqs:
sti
call do_softirq
- jmp svm_asm_do_resume
+ jmp .Lresume
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