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Re: [Xen-devel] [PATCH 3/6] xen/domctl: Consolidate hypercall continuation handling at the top level
- To: Julien Grall <julien@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 9 Dec 2019 17:20:56 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 09 Dec 2019 17:21:24 +0000
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On 08/12/2019 12:18, Julien Grall wrote:
> Hi,
>
> On 05/12/2019 22:30, Andrew Cooper wrote:
>> More paths are going start using hypercall continuations. We could
>> add extra
>> calls to hypercall_create_continuation() but it is much easier to handle
>> -ERESTART once at the top level.
>>
>> One complication is XEN_DOMCTL_shadow_op, which for XSA-97 and ABI
>> compatibility in a security fix, turn a DOMCTL continuation into
>> __HYPERVISOR_arch_1. This remains as it was, gaining a comment
>> explaining
>> what is going on.
>>
>> With -ERESTART handling in place, the !domctl_lock_acquire() path can
>> use the
>> normal exit path, instead of opencoding a subset of it locally.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> ---
>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>> CC: Wei Liu <wl@xxxxxxx>
>> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>> CC: Julien Grall <julien@xxxxxxx>
>> CC: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
>> ---
>> xen/arch/x86/domctl.c | 5 ++++-
>> xen/arch/x86/mm/hap/hap.c | 3 +--
>> xen/arch/x86/mm/shadow/common.c | 3 +--
>> xen/common/domctl.c | 19 +++++--------------
>
> You seem to have missed the hypercall_create_continuation() call in
> iommu_do_pci_domctl().
So I have. Fixed.
~Andrew
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