[Xen-changelog] [xen master] x86/HVM: 32-bit IN result must be zero-extended to 64 bits (part 2)

[patchbot@xxxxxxx]

commit 1e521eddeb51a9f1bf0e4dd1d17efc873eafae41
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Nov 15 11:01:49 2013 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Nov 15 11:01:49 2013 +0100

    x86/HVM: 32-bit IN result must be zero-extended to 64 bits (part 2)
    
    Just spotted a counterpart of what commit 9d89100b (same title) dealt
    with.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Keir Fraser <keir@xxxxxxx>
---
 xen/arch/x86/hvm/io.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/io.c b/xen/arch/x86/hvm/io.c
index deb7b92..15e0b4c 100644
--- a/xen/arch/x86/hvm/io.c
+++ b/xen/arch/x86/hvm/io.c
@@ -290,8 +290,10 @@ void hvm_io_assist(ioreq_t *p)
         (void)handle_mmio();
         break;
     case HVMIO_handle_pio_awaiting_completion:
-        memcpy(&guest_cpu_user_regs()->eax,
-               &p->data, vio->io_size);
+        if ( vio->io_size == 4 ) /* Needs zero extension. */
+            guest_cpu_user_regs()->rax = (uint32_t)p->data;
+        else
+            memcpy(&guest_cpu_user_regs()->rax, &p->data, vio->io_size);
         break;
     default:
         break;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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