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authorGlauber Costa <glommer@redhat.com>2010-05-11 12:17:39 -0400
committerAvi Kivity <avi@redhat.com>2010-05-19 11:40:59 +0300
commit424c32f1aa3112632a657d45698c8e7666668f78 (patch)
treec63fd6d83b6f2cbcb979b3f55c9a07425b13053f /arch/x86/include/asm/pvclock-abi.h
parentb69e8caef5b190af48c525f6d715e7b7728a77f6 (diff)
downloadop-kernel-dev-424c32f1aa3112632a657d45698c8e7666668f78.zip
op-kernel-dev-424c32f1aa3112632a657d45698c8e7666668f78.tar.gz
x86, paravirt: Enable pvclock flags in vcpu_time_info structure
This patch removes one padding byte and transform it into a flags field. New versions of guests using pvclock will query these flags upon each read. Flags, however, will only be interpreted when the guest decides to. It uses the pvclock_valid_flags function to signal that a specific set of flags should be taken into consideration. Which flags are valid are usually devised via HV negotiation. Signed-off-by: Glauber Costa <glommer@redhat.com> CC: Jeremy Fitzhardinge <jeremy@goop.org> Acked-by: Zachary Amsden <zamsden@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/pvclock-abi.h')
-rw-r--r--arch/x86/include/asm/pvclock-abi.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/include/asm/pvclock-abi.h b/arch/x86/include/asm/pvclock-abi.h
index 6d93508..ec5c41a 100644
--- a/arch/x86/include/asm/pvclock-abi.h
+++ b/arch/x86/include/asm/pvclock-abi.h
@@ -29,7 +29,8 @@ struct pvclock_vcpu_time_info {
u64 system_time;
u32 tsc_to_system_mul;
s8 tsc_shift;
- u8 pad[3];
+ u8 flags;
+ u8 pad[2];
} __attribute__((__packed__)); /* 32 bytes */
struct pvclock_wall_clock {
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