# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1201022331 0
# Node ID dbb5a79837759726b0ea600e8122efd8efd334de
# Parent a878752a83f9c610d678b894063b133a5cf0719a
vmx realmode: Faster emulation of REP INS and REP OUTS.
This makes, in particular, reading files via the BIOS disk abstraction
much much much faster.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
xen/arch/x86/hvm/vmx/realmode.c | 60 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 60 insertions(+)
diff -r a878752a83f9 -r dbb5a7983775 xen/arch/x86/hvm/vmx/realmode.c
--- a/xen/arch/x86/hvm/vmx/realmode.c Tue Jan 22 17:18:02 2008 +0000
+++ b/xen/arch/x86/hvm/vmx/realmode.c Tue Jan 22 17:18:51 2008 +0000
@@ -221,6 +221,64 @@ realmode_emulate_cmpxchg(
{
/* Fix this in case the guest is really relying on r-m-w atomicity. */
return realmode_emulate_write(seg, offset, new, bytes, ctxt);
+}
+
+static int
+realmode_rep_ins(
+ uint16_t src_port,
+ enum x86_segment dst_seg,
+ unsigned long dst_offset,
+ unsigned int bytes_per_rep,
+ unsigned long *reps,
+ struct x86_emulate_ctxt *ctxt)
+{
+ struct realmode_emulate_ctxt *rm_ctxt =
+ container_of(ctxt, struct realmode_emulate_ctxt, ctxt);
+ struct vcpu *curr = current;
+ uint32_t paddr = rm_ctxt->seg_reg[dst_seg].base + dst_offset;
+
+ if ( curr->arch.hvm_vmx.real_mode_io_in_progress )
+ return X86EMUL_UNHANDLEABLE;
+
+ if ( !curr->arch.hvm_vmx.real_mode_io_completed )
+ {
+ curr->arch.hvm_vmx.real_mode_io_in_progress = 1;
+ send_pio_req(src_port, *reps, bytes_per_rep,
+ paddr, IOREQ_READ,
+ !!(ctxt->regs->eflags & X86_EFLAGS_DF), 1);
+ }
+
+ if ( !curr->arch.hvm_vmx.real_mode_io_completed )
+ return X86EMUL_RETRY;
+
+ curr->arch.hvm_vmx.real_mode_io_completed = 0;
+
+ return X86EMUL_OKAY;
+}
+
+static int
+realmode_rep_outs(
+ enum x86_segment src_seg,
+ unsigned long src_offset,
+ uint16_t dst_port,
+ unsigned int bytes_per_rep,
+ unsigned long *reps,
+ struct x86_emulate_ctxt *ctxt)
+{
+ struct realmode_emulate_ctxt *rm_ctxt =
+ container_of(ctxt, struct realmode_emulate_ctxt, ctxt);
+ struct vcpu *curr = current;
+ uint32_t paddr = rm_ctxt->seg_reg[src_seg].base + src_offset;
+
+ if ( curr->arch.hvm_vmx.real_mode_io_in_progress )
+ return X86EMUL_UNHANDLEABLE;
+
+ curr->arch.hvm_vmx.real_mode_io_in_progress = 1;
+ send_pio_req(dst_port, *reps, bytes_per_rep,
+ paddr, IOREQ_WRITE,
+ !!(ctxt->regs->eflags & X86_EFLAGS_DF), 1);
+
+ return X86EMUL_OKAY;
}
static int
@@ -420,6 +478,8 @@ static struct x86_emulate_ops realmode_e
.insn_fetch = realmode_emulate_insn_fetch,
.write = realmode_emulate_write,
.cmpxchg = realmode_emulate_cmpxchg,
+ .rep_ins = realmode_rep_ins,
+ .rep_outs = realmode_rep_outs,
.read_segment = realmode_read_segment,
.write_segment = realmode_write_segment,
.read_io = realmode_read_io,
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