x86/msr: Drop stale comment for vcpu_msrs.spec_ctrl

More than the bottom two bits are now defined, and the MSR policy work has
shown that using non-architectural representations turns out to be problematic
for more than just asm code.  As the architectural representation is the
expected default, we don't need to justify why we are using it.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>

diff --git a/xen/include/asm-x86/msr.h b/xen/include/asm-x86/msr.h
index 3a2c799c2d19446a0bcb2dcb2e004fd3a3064127..9b4e4e07f12f3c5d4d13366b786e3578eae31b5d 100644 (file)
--- a/xen/include/asm-x86/msr.h
+++ b/xen/include/asm-x86/msr.h
@@ -287,11 +287,6 @@ struct vcpu_msrs
 {
     /* 0x00000048 - MSR_SPEC_CTRL */
     struct {
-        /*
-         * Only the bottom two bits are defined, so no need to waste space
-         * with uint64_t at the moment, but use uint32_t for the convenience
-         * of the assembly code.
-         */
         uint32_t raw;
     } spec_ctrl;