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[2/4,v5] KVM: X86: Add a utility function to read current RIP

Message ID 20210323175006.73249-3-krish.sadhukhan@oracle.com (mailing list archive)
State New, archived
Headers show
Series nSVM: Test host RFLAGS.TF on VMRUN | expand

Commit Message

Krish Sadhukhan March 23, 2021, 5:50 p.m. UTC 
Some tests may require to know the current RIP to compares tests results. Add
a function to read current RIP.

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
---
 lib/x86/processor.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/lib/x86/processor.h b/lib/x86/processor.h
index 87112bd..5604874 100644
--- a/lib/x86/processor.h
+++ b/lib/x86/processor.h
@@ -489,6 +489,13 @@  static inline unsigned long long rdtsc(void)
 	return r;
 }
 
+static inline u64 read_rip(void)
+{
+	u64 val;
+	asm volatile ("lea (%%rip),%0" : "=r"(val) : : "memory");
+	return val;
+}
+
 /*
  * Per the advice in the SDM, volume 2, the sequence "mfence; lfence"
  * executed immediately before rdtsc ensures that rdtsc will be