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Re: [PATCH v2 1/2] x86/dom0: fix restoring %cr3 and the mapcache override on PV build error
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 31 Jul 2024 10:02:09 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 31 Jul 2024 08:02:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31.07.2024 09:57, Roger Pau Monné wrote:
> On Wed, Jul 31, 2024 at 08:32:03AM +0200, Jan Beulich wrote:
>> On 30.07.2024 17:28, Roger Pau Monne wrote:
>>> --- a/xen/arch/x86/pv/dom0_build.c
>>> +++ b/xen/arch/x86/pv/dom0_build.c
>>> @@ -825,6 +825,8 @@ int __init dom0_construct_pv(struct domain *d,
>>> rc = elf_load_binary(&elf);
>>> if ( rc < 0 )
>>> {
>>> + mapcache_override_current(NULL);
>>> + switch_cr3_cr4(current->arch.cr3, read_cr4());
>>> printk("Failed to load the kernel binary\n");
>>> goto out;
>>> }
>>
>> Just below here we have
>>
>> bootstrap_map(NULL);
>>
>> This too is wanted in the error case aiui. Happy to move it up immediately
>> ahead of the if() while committing, so long as you agree. Then:
>> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> I'm happy with this, but note there are further instances of error
> paths above this one that already don't remove the bootstrap mappings.
Hmm, you're right. I'll leave that untouched then.
Jan
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