From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>,
David Hildenbrand <david@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Thomas Huth <thuth@redhat.com>,
Andreas Krebbel <krebbel@linux.vnet.ibm.com>
Subject: Re: [PATCH RFC 0/2] KVM: s390: avoid having to enable vm.alloc_pgste
Date: Wed, 7 Jun 2017 22:47:56 +0200 [thread overview]
Message-ID: <20170607204756.GA3143@osiris> (raw)
In-Reply-To: <20170607143440.7c86af85@mschwideX1>
On Wed, Jun 07, 2017 at 02:34:40PM +0200, Martin Schwidefsky wrote:
> +#define arch_elf_pt_proc(ehdr, phdr, elf, interp, state) \
> +({ \
> + struct elf64_hdr *_ehdr = (void *) ehdr; \
> + struct elf64_phdr *_phdr = (void *) phdr; \
> + int _rc = 0; \
> + if (_ehdr->e_ident[EI_CLASS] == ELFCLASS64 && \
> + _phdr->p_type == PT_S390_REQUEST_PGSTE && \
> + !page_table_allocate_pgste && \
> + !test_thread_flag(TIF_REQUEST_PGSTE)) { \
> + set_thread_flag(TIF_REQUEST_PGSTE); \
> + set_pt_regs_flag(task_pt_regs(current), \
> + PIF_SYSCALL_RESTART); \
> + _rc = -EAGAIN; \
> + } \
> + _rc; \
> +})
I'm wondering if this should simply fail, if a PT_S390_REQUEST_PGSTE type
segment exists, but it is not ELFCLASS64?
It will fail later anyway on s390_enable_sie(), but...
> diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
> index c119d564d8f2..1201b18e817d 100644
> --- a/arch/s390/include/asm/mmu_context.h
> +++ b/arch/s390/include/asm/mmu_context.h
> @@ -25,7 +25,8 @@ static inline int init_new_context(struct task_struct *tsk,
> mm->context.gmap_asce = 0;
> mm->context.flush_mm = 0;
> #ifdef CONFIG_PGSTE
> - mm->context.alloc_pgste = page_table_allocate_pgste;
> + mm->context.alloc_pgste = page_table_allocate_pgste ||
> + test_thread_flag(TIF_REQUEST_PGSTE);
I think the alloc_pgste flag should be inherited on fork, no?
next prev parent reply other threads:[~2017-06-07 20:48 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-29 16:32 [PATCH RFC 0/2] KVM: s390: avoid having to enable vm.alloc_pgste David Hildenbrand
2017-05-29 16:32 ` [PATCH RFC 1/2] s390x: mm: allow mixed page table types (2k and 4k) David Hildenbrand
2017-06-01 11:39 ` Christian Borntraeger
2017-06-01 12:44 ` David Hildenbrand
2017-06-01 12:59 ` David Hildenbrand
2017-06-02 7:11 ` Christian Borntraeger
2017-05-29 16:32 ` [PATCH RFC 2/2] KVM: s390: Introduce KVM_VM_S390_LATE_MMAP David Hildenbrand
2017-06-01 10:46 ` [PATCH RFC 0/2] KVM: s390: avoid having to enable vm.alloc_pgste Martin Schwidefsky
2017-06-01 11:24 ` Christian Borntraeger
2017-06-01 11:27 ` David Hildenbrand
2017-06-02 7:06 ` Heiko Carstens
2017-06-02 7:02 ` Heiko Carstens
2017-06-02 7:13 ` Christian Borntraeger
2017-06-02 7:16 ` Martin Schwidefsky
2017-06-02 7:18 ` Christian Borntraeger
2017-06-02 7:25 ` Christian Borntraeger
2017-06-02 8:11 ` Martin Schwidefsky
2017-06-02 9:46 ` Martin Schwidefsky
2017-06-02 10:19 ` Christian Borntraeger
2017-06-02 10:53 ` Martin Schwidefsky
2017-06-02 13:20 ` Christian Borntraeger
2017-06-07 12:34 ` Martin Schwidefsky
2017-06-07 20:47 ` Heiko Carstens [this message]
2017-06-08 5:35 ` Martin Schwidefsky
2017-06-08 6:25 ` Heiko Carstens
2017-06-08 11:24 ` Martin Schwidefsky
2017-06-08 13:17 ` Heiko Carstens
2017-06-02 10:28 ` Heiko Carstens
2017-06-02 10:48 ` Martin Schwidefsky
2017-06-02 10:54 ` David Hildenbrand
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