From: Marcelo Tosatti <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
diff --git a/kvm/test/lib/x86/fwcfg.c b/kvm/test/lib/x86/fwcfg.c
index 2cf7cec..e2cdd15 100644
--- a/kvm/test/lib/x86/fwcfg.c
+++ b/kvm/test/lib/x86/fwcfg.c
@@ -1,4 +1,7 @@
#include "fwcfg.h"
+#include "smp.h"
+
+static struct spinlock lock;
uint64_t fwcfg_get_u(uint16_t index, int bytes)
{
@@ -6,11 +9,13 @@ uint64_t fwcfg_get_u(uint16_t index, int bytes)
uint8_t b;
int i;
+ spin_lock(&lock);
asm volatile ("out %0, %1" : : "a"(index), "d"((uint16_t)BIOS_CFG_IOPORT));
for (i = 0; i < bytes; ++i) {
asm volatile ("in %1, %0" : "=a"(b) : "d"((uint16_t)(BIOS_CFG_IOPORT +
1)));
r |= (uint64_t)b << (i * 8);
}
+ spin_unlock(&lock);
return r;
}
--
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