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Peter Anvin" , Vitaly Kuznetsov , Juergen Gross , Boris Ostrovsky , David Woodhouse , Paul Durrant , Jonathan Cameron , Sascha Bischoff , Marc Zyngier , Joey Gouly , Jack Allister , Dongli Zhang , joe.jin@oracle.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, linux-kselftest@vger.kernel.org Subject: [PATCH v6 33/36] KVM: x86: Compute kvmclock base without pvclock_gtod_data Date: Fri, 3 Jul 2026 22:18:12 +0100 Message-ID: <20260703212145.343527-34-dwmw2@infradead.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260703212145.343527-1-dwmw2@infradead.org> References: <20260703212145.343527-1-dwmw2@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-purgate-ID: tlsNG-d62444/1783113741-80AD11E0-32343D7B/0/0 X-purgate-type: clean X-purgate-size: 1092 X-ZohoMail-DKIM: pass (identity @infradead.org) X-ZM-MESSAGEID: 1783113772522158500 Content-Type: text/plain; charset="utf-8" From: David Woodhouse 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 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 56afd5e66c06..8d520bfae089 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_to_ns(ktime_mono_to_any(ktime_get_raw(), TK_OFFS_BOOT)); } =20 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock, int se= c_hi_ofs) --=20 2.54.0