[Xen-changelog] [xen master] nested vmx: fix I/O port bitmap indexing arithmetic

[patchbot@xxxxxxx]

commit b80e4583501904297d2ff5b0f905e68f81f8f2c9
Author:     Matthew Daley <mattd@xxxxxxxxxxx>
AuthorDate: Tue Dec 3 09:51:54 2013 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Dec 3 09:51:54 2013 +0100

    nested vmx: fix I/O port bitmap indexing arithmetic
    
    The I/O port bitmap holds 8 ports per element, and hence the port number
    used when indexing into it should be shifted right by 3 bits, not 4.
    
    Signed-off-by: Matthew Daley <mattd@xxxxxxxxxxx>
    Reviewed-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
    Acked-by: Eddie Dong <eddie.dong@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vvmx.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index 248e975..7fa110e 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -2225,7 +2225,7 @@ int nvmx_n2_vmexit_handler(struct cpu_user_regs *regs,
             __vmread(EXIT_QUALIFICATION, &qual);
             port = qual >> 16;
             bitmap = nvmx->iobitmap[port >> 15];
-            if ( bitmap[(port & 0x7fff) >> 4] & (1 << (port & 0x7)) )
+            if ( bitmap[(port & 0x7fff) >> 3] & (1 << (port & 0x7)) )
                 nvcpu->nv_vmexit_pending = 1;
             if ( !nvcpu->nv_vmexit_pending )
                gdprintk(XENLOG_WARNING, "L0 PIO %x.\n", port);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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