| Subject | Re: [patch 01/60] x86/entry/64/paravirt: Use paravirt-safe macro to access eflags | From | Juergen Gross <> | Date | Tue, 5 Dec 2017 13:17:31 +0100 |
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On 04/12/17 15:07, Thomas Gleixner wrote: > From: Boris Ostrovsky <boris.ostrovsky@oracle.com> > > Commit 1d3e53e8624a ("x86/entry/64: Refactor IRQ stacks and make them > NMI-safe") added DEBUG_ENTRY_ASSERT_IRQS_OFF macro that acceses eflags > using 'pushfq' instruction when testing for IF bit. On PV Xen guests > looking at IF flag directly will always see it set, resulting in 'ud2'. > > Introduce SAVE_FLAGS() macro that will use appropriate save_fl pv op when > running paravirt. > > Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > Cc: jgross@suse.com > Cc: xen-devel@lists.xenproject.org > Cc: luto@kernel.org > Link: https://lkml.kernel.org/r/1512159805-6314-1-git-send-email-boris.ostrovsky@oracle.com
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
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