From patchwork Mon Aug 17 14:47:54 2009
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Subject: [HACK] make vmmouse work with KVM
From: =?utf-8?q?Reimar_D=C3=B6ffinger?= <Reimar.Doeffinger@gmx.de>
X-Patchwork-Id: 31522
Message-Id: <20090817144754.GA31553@1und1.de>
To: qemu-devel@nongnu.org
Date: Mon, 17 Aug 2009 16:47:54 +0200

Hello,
vmmouse uses a giant hack: it uses io ports (in instruction) but passes
data via registers.
This currently does not work since the qemu CPU registers are
(understandably) not kept in sync with the real KVM registers for this
operation.
Attached patch detects access to the vmmouse port and loads/stores CPU
registers into/from the QEMU state.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>


diff --git a/kvm-all.c b/kvm-all.c
index f669c3a..207378b 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -611,11 +611,21 @@ int kvm_cpu_exec(CPUState *env)
         switch (run->exit_reason) {
         case KVM_EXIT_IO:
             dprintf("handle_io\n");
+#if defined(TARGET_I386) || defined(TARGET_X86_64)
+            // HACK to make vmport/vmmouse work
+            if (run->io.port == 0x5658)
+                kvm_arch_get_registers(env);
+#endif
             ret = kvm_handle_io(env, run->io.port,
                                 (uint8_t *)run + run->io.data_offset,
                                 run->io.direction,
                                 run->io.size,
                                 run->io.count);
+#if defined(TARGET_I386) || defined(TARGET_X86_64)
+            // HACK to make vmport/vmmouse work
+            if (run->io.port == 0x5658)
+                kvm_arch_put_registers(env);
+#endif
             break;
         case KVM_EXIT_MMIO:
             dprintf("handle_mmio\n");