Anthony Liguori wrote:
+/*
+ * Control register reads can be trapped. Since trapping is relatively
+ * expensive, we can avoid paying the cost by caching logically.
+ */
+static unsigned long kvm_read_cr(int reg)
+{
+ struct kvm_paravirt_state *state
+ = per_cpu(paravirt_state, smp_processor_id());
+
+ if (unlikely(!state->cr_valid[reg])) {
+ if (reg == 0)
+ state->cached_cr[reg] = native_read_cr0();
+ else if (reg == 3)
+ state->cached_cr[reg] = native_read_cr3();
+ else if (reg == 4)
+ state->cached_cr[reg] = native_read_cr4();
+ else
+ BUG();
+ state->cr_valid[reg] = 1;
+ }
+ return state->cached_cr[reg];
+}
+
It would be good to declare this (and kvm_write_cr) always_inline.
These functions are never called with a non-constant reg parameters, and
the unsightly if tree (more readable as a switch, IMO) will fold nicely
when inlined.
--
error compiling committee.c: too many arguments to function
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