Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
CC: Jan Beulich <jbeul...@suse.com>
CC: Tim Deegan <t...@xen.org>
---
v2:
* Use _write_gate_lower() instead of opencoding write_atomic()
* Drop write_atomic() in _write_gate_lower(). It doesn't appear to make a
practical difference (although certainly does cause a difference to the
register scheduling).
---
xen/include/asm-x86/processor.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index 2773ea8..c5c647a 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -444,9 +444,12 @@ struct __packed __cacheline_aligned tss_struct {
* descriptor table entry. */
static always_inline void set_ist(idt_entry_t *idt, unsigned long ist)
{
+ idt_entry_t new = *idt;
+
/* IST is a 3 bit field, 32 bits into the IDT entry. */
ASSERT(ist <= IST_MAX);
- idt->a = (idt->a & ~(7UL << 32)) | (ist << 32);
+ new.a = (idt->a & ~(7UL << 32)) | (ist << 32);
+ _write_gate_lower(idt, &new);
}
#define IDT_ENTRIES 256
--
1.7.10.4
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