[RFC PATCH 5/8] KVM: x86: Compute kvmclock base without pvclock_gtod_data

[David Woodhouse]

From: David Woodhouse <dwmw@xxxxxxxxxxxx>

get_kvmclock_base_ns() needs CLOCK_MONOTONIC_RAW + offs_boot. Compute
this directly rather than reading offs_boot from the pvclock_gtod_data
private copy. offs_boot only changes at suspend/resume so does not
need to be atomically paired with the raw clock read.

Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
Assisted-by: Kiro:claude-opus-4.6-1m
---
 arch/x86/kvm/x86.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e6f740f95ff9..d057f42603e4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2402,7 +2402,7 @@ static void update_pvclock_gtod(struct timekeeper *tk)
 static s64 get_kvmclock_base_ns(void)
 {
 	/* Count up from boot time, but with the frequency of the raw clock.  */
-	return ktime_to_ns(ktime_add(ktime_get_raw(), pvclock_gtod_data.offs_boot));
+	return ktime_get_raw_ns() + ktime_to_ns(ktime_mono_to_any(0, TK_OFFS_BOOT));
 }
 
 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock, int sec_hi_ofs)
-- 
2.54.0