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SUSE:SLE-12-SP1:GA
xen.787
55506a66-x86-keep-high-bits-of-RAX-on-guest-por...
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File 55506a66-x86-keep-high-bits-of-RAX-on-guest-port-reads.patch of Package xen.787
# Commit 1191aa9d1988c469844eb4545689617a8b13eae1 # Date 2015-05-11 10:37:58 +0200 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> x86: don't clear high 32 bits of RAX on sub-word guest I/O port reads 1- or 2-byte operations never alter the high halves of registers. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> --- a/xen/arch/x86/traps.c +++ b/xen/arch/x86/traps.c @@ -2126,7 +2126,7 @@ static int emulate_privileged_op(struct if ( op_bytes == 4 ) regs->eax = 0; else - regs->eax &= ~((1u << (op_bytes * 8)) - 1); + regs->eax &= ~((1 << (op_bytes * 8)) - 1); regs->eax |= guest_io_read(port, op_bytes, v, regs); } bpmatch = check_guest_io_breakpoint(v, port, op_bytes);
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