@@ -75,6 +75,11 @@ static inline bool ia32_enabled(void)
return __ia32_enabled;
}
+static inline void ia32_disable(void)
+{
+ __ia32_enabled = false;
+}
+
#else /* !CONFIG_IA32_EMULATION */
static inline bool ia32_enabled(void)
@@ -82,6 +87,8 @@ static inline bool ia32_enabled(void)
return IS_ENABLED(CONFIG_X86_32);
}
+static inline void ia32_disable(void) {}
+
#endif
#endif /* _ASM_X86_IA32_H */
@@ -31,6 +31,7 @@
#include <asm/processor-flags.h>
#include <asm/msr.h>
#include <asm/cmdline.h>
+#include <asm/ia32.h>
#include "mm_internal.h"
@@ -196,6 +197,16 @@ void __init sme_early_init(void)
if (sev_active())
swiotlb_force = SWIOTLB_FORCE;
+
+ /*
+ * The VMM is capable of injecting interrupt 0x80 and triggering the
+ * compatibility syscall path.
+ *
+ * By default, the 32-bit emulation is disabled in order to ensure
+ * the safety of the VM.
+ */
+ if (sev_status & MSR_AMD64_SEV_ENABLED)
+ ia32_disable();
}
void __init sev_setup_arch(void)