From: Marcelo Tosatti <mtosatti@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Luiz Capitulino <lcapitulino@redhat.com>,
kvm@vger.kernel.org, Marcelo Tosatti <mtosatti@redhat.com>
Subject: [patch 1/3] x86: kvmclock: add flag to indicate pvclock counts from zero
Date: Wed, 27 May 2015 22:46:58 -0300 [thread overview]
Message-ID: <20150528014929.375138720@redhat.com> (raw)
In-Reply-To: 20150528014657.367253422@redhat.com
[-- Attachment #1: 01-pvclock-add-flag --]
[-- Type: text/plain, Size: 880 bytes --]
Setting sched clock stable for kvmclock causes the printk timestamps
to not start from zero, which is different from baremetal and
can possibly break userspace. Add a flag to indicate that
hypervisor sets clock base at zero when kvmclock is initialized.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
arch/x86/include/asm/pvclock-abi.h | 1 +
1 file changed, 1 insertion(+)
Index: kvm/arch/x86/include/asm/pvclock-abi.h
===================================================================
--- kvm.orig/arch/x86/include/asm/pvclock-abi.h 2014-11-06 23:59:14.615913334 -0200
+++ kvm/arch/x86/include/asm/pvclock-abi.h 2015-05-27 17:40:53.435192771 -0300
@@ -41,5 +41,6 @@
#define PVCLOCK_TSC_STABLE_BIT (1 << 0)
#define PVCLOCK_GUEST_STOPPED (1 << 1)
+#define PVCLOCK_COUNTS_FROM_ZERO (1 << 2)
#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_PVCLOCK_ABI_H */
next prev parent reply other threads:[~2015-05-28 1:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-28 1:46 [patch 0/3] kvmclock: allow stable sched clock Marcelo Tosatti
2015-05-28 1:46 ` Marcelo Tosatti [this message]
2015-05-28 1:46 ` [patch 2/3] x86: kvmclock: set scheduler clock stable Marcelo Tosatti
2015-05-28 8:39 ` Paolo Bonzini
2015-05-28 1:47 ` [patch 3/3] KVM: x86: zero kvmclock_offset when vcpu0 initializes kvmclock system MSR Marcelo Tosatti
2015-05-28 8:52 ` Paolo Bonzini
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