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x86, paravirt: Enable pvclock flags in vcpu_time_info structure

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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>
This commit is contained in:
Glauber Costa
2010-05-11 12:17:39 -04:00
committed by Avi Kivity
parent b69e8caef5
commit 424c32f1aa
3 changed files with 12 additions and 1 deletions
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3
arch/x86/include/asm/pvclock-abi.h
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@@ -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 {