[PATCH 0/3] xen: do some cleanups

[PATCH 0/3] xen: do some cleanups

[Juergen Gross]

Remove stuff no longer needed.

Juergen Gross (3):
  xen: remove tests for pvh mode in pure pv paths
  xen: remove unused function xen_set_domain_pte()
  xen: remove not used trace functions

 arch/x86/include/asm/xen/page.h |  5 -----
 arch/x86/xen/mmu_pv.c           | 20 --------------------
 arch/x86/xen/p2m.c              | 25 +------------------------
 arch/x86/xen/setup.c            |  5 +----
 include/trace/events/xen.h      | 38 --------------------------------------
 5 files changed, 2 insertions(+), 91 deletions(-)

-- 
2.12.3

[PATCH 1/3] xen: remove tests for pvh mode in pure pv paths

[Juergen Gross]

Remove the last tests for XENFEAT_auto_translated_physmap in pure
PV-domain specific paths. PVH V1 is gone and the feature will always
be "false" in PV guests.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 arch/x86/include/asm/xen/page.h |  3 ---
 arch/x86/xen/p2m.c              | 25 +------------------------
 arch/x86/xen/setup.c            |  5 +----
 3 files changed, 2 insertions(+), 31 deletions(-)

diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 8417ef7c3885..497f7d28c1d6 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -158,9 +158,6 @@ static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn)
 	unsigned long pfn;
 	int ret;
 
-	if (xen_feature(XENFEAT_auto_translated_physmap))
-		return mfn;
-
 	if (unlikely(mfn >= machine_to_phys_nr))
 		return ~0;
 
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 276da636dd39..6083ba462f35 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -212,8 +212,7 @@ void __ref xen_build_mfn_list_list(void)
 	unsigned int level, topidx, mididx;
 	unsigned long *mid_mfn_p;
 
-	if (xen_feature(XENFEAT_auto_translated_physmap) ||
-	    xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
+	if (xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
 		return;
 
 	/* Pre-initialize p2m_top_mfn to be completely missing */
@@ -269,9 +268,6 @@ void __ref xen_build_mfn_list_list(void)
 
 void xen_setup_mfn_list_list(void)
 {
-	if (xen_feature(XENFEAT_auto_translated_physmap))
-		return;
-
 	BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
 
 	if (xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
@@ -291,9 +287,6 @@ void __init xen_build_dynamic_phys_to_machine(void)
 {
 	unsigned long pfn;
 
-	 if (xen_feature(XENFEAT_auto_translated_physmap))
-		return;
-
 	xen_p2m_addr = (unsigned long *)xen_start_info->mfn_list;
 	xen_p2m_size = ALIGN(xen_start_info->nr_pages, P2M_PER_PAGE);
 
@@ -540,9 +533,6 @@ int xen_alloc_p2m_entry(unsigned long pfn)
 	unsigned long addr = (unsigned long)(xen_p2m_addr + pfn);
 	unsigned long p2m_pfn;
 
-	if (xen_feature(XENFEAT_auto_translated_physmap))
-		return 0;
-
 	ptep = lookup_address(addr, &level);
 	BUG_ON(!ptep || level != PG_LEVEL_4K);
 	pte_pg = (pte_t *)((unsigned long)ptep & ~(PAGE_SIZE - 1));
@@ -640,9 +630,6 @@ unsigned long __init set_phys_range_identity(unsigned long pfn_s,
 	if (unlikely(pfn_s >= xen_p2m_size))
 		return 0;
 
-	if (unlikely(xen_feature(XENFEAT_auto_translated_physmap)))
-		return pfn_e - pfn_s;
-
 	if (pfn_s > pfn_e)
 		return 0;
 
@@ -660,10 +647,6 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 	pte_t *ptep;
 	unsigned int level;
 
-	/* don't track P2M changes in autotranslate guests */
-	if (unlikely(xen_feature(XENFEAT_auto_translated_physmap)))
-		return true;
-
 	if (unlikely(pfn >= xen_p2m_size)) {
 		BUG_ON(mfn != INVALID_P2M_ENTRY);
 		return true;
@@ -711,9 +694,6 @@ int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
 	int i, ret = 0;
 	pte_t *pte;
 
-	if (xen_feature(XENFEAT_auto_translated_physmap))
-		return 0;
-
 	if (kmap_ops) {
 		ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref,
 						kmap_ops, count);
@@ -756,9 +736,6 @@ int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
 {
 	int i, ret = 0;
 
-	if (xen_feature(XENFEAT_auto_translated_physmap))
-		return 0;
-
 	for (i = 0; i < count; i++) {
 		unsigned long mfn = __pfn_to_mfn(page_to_pfn(pages[i]));
 		unsigned long pfn = page_to_pfn(pages[i]);
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index c81046323ebc..ac55c02f98e9 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -340,8 +340,6 @@ static void __init xen_do_set_identity_and_remap_chunk(
 
 	WARN_ON(size == 0);
 
-	BUG_ON(xen_feature(XENFEAT_auto_translated_physmap));
-
 	mfn_save = virt_to_mfn(buf);
 
 	for (ident_pfn_iter = start_pfn, remap_pfn_iter = remap_pfn;
@@ -1024,8 +1022,7 @@ void __init xen_pvmmu_arch_setup(void)
 void __init xen_arch_setup(void)
 {
 	xen_panic_handler_init();
-	if (!xen_feature(XENFEAT_auto_translated_physmap))
-		xen_pvmmu_arch_setup();
+	xen_pvmmu_arch_setup();
 
 #ifdef CONFIG_ACPI
 	if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
-- 
2.12.3

Re: [PATCH 1/3] xen: remove tests for pvh mode in pure pv paths

[Boris Ostrovsky]

On 08/04/2017 07:36 AM, Juergen Gross wrote:
> Remove the last tests for XENFEAT_auto_translated_physmap in pure
> PV-domain specific paths. PVH V1 is gone and the feature will always
> be "false" in PV guests.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

I wonder whether the remaining use of this flag can be replaced with
appropriate xen_*_domain()?

-boris

[PATCH 2/3] xen: remove unused function xen_set_domain_pte()

[Juergen Gross]

The function xen_set_domain_pte() is used nowhere in the kernel.
Remove it.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 arch/x86/include/asm/xen/page.h |  2 --
 arch/x86/xen/mmu_pv.c           | 20 --------------------
 include/trace/events/xen.h      | 18 ------------------
 3 files changed, 40 deletions(-)

diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 497f7d28c1d6..07b6531813c4 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -314,8 +314,6 @@ static inline pte_t __pte_ma(pteval_t x)
 #define p4d_val_ma(x)	((x).p4d)
 #endif
 
-void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid);
-
 xmaddr_t arbitrary_virt_to_machine(void *address);
 unsigned long arbitrary_virt_to_mfn(void *vaddr);
 void make_lowmem_page_readonly(void *vaddr);
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index cab28cf2cffb..0422ee7e70b3 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -162,26 +162,6 @@ static bool xen_page_pinned(void *ptr)
 	return PagePinned(page);
 }
 
-void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
-{
-	struct multicall_space mcs;
-	struct mmu_update *u;
-
-	trace_xen_mmu_set_domain_pte(ptep, pteval, domid);
-
-	mcs = xen_mc_entry(sizeof(*u));
-	u = mcs.args;
-
-	/* ptep might be kmapped when using 32-bit HIGHPTE */
-	u->ptr = virt_to_machine(ptep).maddr;
-	u->val = pte_val_ma(pteval);
-
-	MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid);
-
-	xen_mc_issue(PARAVIRT_LAZY_MMU);
-}
-EXPORT_SYMBOL_GPL(xen_set_domain_pte);
-
 static void xen_extend_mmu_update(const struct mmu_update *update)
 {
 	struct multicall_space mcs;
diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
index b70a38b7fa84..677e8ac2bb81 100644
--- a/include/trace/events/xen.h
+++ b/include/trace/events/xen.h
@@ -149,24 +149,6 @@ DECLARE_EVENT_CLASS(xen_mmu__set_pte,
 DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte);
 DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte_atomic);
 
-TRACE_EVENT(xen_mmu_set_domain_pte,
-	    TP_PROTO(pte_t *ptep, pte_t pteval, unsigned domid),
-	    TP_ARGS(ptep, pteval, domid),
-	    TP_STRUCT__entry(
-		    __field(pte_t *, ptep)
-		    __field(pteval_t, pteval)
-		    __field(unsigned, domid)
-		    ),
-	    TP_fast_assign(__entry->ptep = ptep;
-			   __entry->pteval = pteval.pte;
-			   __entry->domid = domid),
-	    TP_printk("ptep %p pteval %0*llx (raw %0*llx) domid %u",
-		      __entry->ptep,
-		      (int)sizeof(pteval_t) * 2, (unsigned long long)pte_val(native_make_pte(__entry->pteval)),
-		      (int)sizeof(pteval_t) * 2, (unsigned long long)__entry->pteval,
-		      __entry->domid)
-	);
-
 TRACE_EVENT(xen_mmu_set_pte_at,
 	    TP_PROTO(struct mm_struct *mm, unsigned long addr,
 		     pte_t *ptep, pte_t pteval),
-- 
2.12.3

Re: [PATCH 2/3] xen: remove unused function xen_set_domain_pte()

[Boris Ostrovsky]

On 08/04/2017 07:36 AM, Juergen Gross wrote:
> The function xen_set_domain_pte() is used nowhere in the kernel.
> Remove it.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

(+ Ingo and Steven who are maintainers of include/trace/events/xen.h)

> ---
>  arch/x86/include/asm/xen/page.h |  2 --
>  arch/x86/xen/mmu_pv.c           | 20 --------------------
>  include/trace/events/xen.h      | 18 ------------------
>  3 files changed, 40 deletions(-)
>
> diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
> index 497f7d28c1d6..07b6531813c4 100644
> --- a/arch/x86/include/asm/xen/page.h
> +++ b/arch/x86/include/asm/xen/page.h
> @@ -314,8 +314,6 @@ static inline pte_t __pte_ma(pteval_t x)
>  #define p4d_val_ma(x)	((x).p4d)
>  #endif
>  
> -void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid);
> -
>  xmaddr_t arbitrary_virt_to_machine(void *address);
>  unsigned long arbitrary_virt_to_mfn(void *vaddr);
>  void make_lowmem_page_readonly(void *vaddr);
> diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
> index cab28cf2cffb..0422ee7e70b3 100644
> --- a/arch/x86/xen/mmu_pv.c
> +++ b/arch/x86/xen/mmu_pv.c
> @@ -162,26 +162,6 @@ static bool xen_page_pinned(void *ptr)
>  	return PagePinned(page);
>  }
>  
> -void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
> -{
> -	struct multicall_space mcs;
> -	struct mmu_update *u;
> -
> -	trace_xen_mmu_set_domain_pte(ptep, pteval, domid);
> -
> -	mcs = xen_mc_entry(sizeof(*u));
> -	u = mcs.args;
> -
> -	/* ptep might be kmapped when using 32-bit HIGHPTE */
> -	u->ptr = virt_to_machine(ptep).maddr;
> -	u->val = pte_val_ma(pteval);
> -
> -	MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid);
> -
> -	xen_mc_issue(PARAVIRT_LAZY_MMU);
> -}
> -EXPORT_SYMBOL_GPL(xen_set_domain_pte);
> -
>  static void xen_extend_mmu_update(const struct mmu_update *update)
>  {
>  	struct multicall_space mcs;
> diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
> index b70a38b7fa84..677e8ac2bb81 100644
> --- a/include/trace/events/xen.h
> +++ b/include/trace/events/xen.h
> @@ -149,24 +149,6 @@ DECLARE_EVENT_CLASS(xen_mmu__set_pte,
>  DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte);
>  DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte_atomic);
>  
> -TRACE_EVENT(xen_mmu_set_domain_pte,
> -	    TP_PROTO(pte_t *ptep, pte_t pteval, unsigned domid),
> -	    TP_ARGS(ptep, pteval, domid),
> -	    TP_STRUCT__entry(
> -		    __field(pte_t *, ptep)
> -		    __field(pteval_t, pteval)
> -		    __field(unsigned, domid)
> -		    ),
> -	    TP_fast_assign(__entry->ptep = ptep;
> -			   __entry->pteval = pteval.pte;
> -			   __entry->domid = domid),
> -	    TP_printk("ptep %p pteval %0*llx (raw %0*llx) domid %u",
> -		      __entry->ptep,
> -		      (int)sizeof(pteval_t) * 2, (unsigned long long)pte_val(native_make_pte(__entry->pteval)),
> -		      (int)sizeof(pteval_t) * 2, (unsigned long long)__entry->pteval,
> -		      __entry->domid)
> -	);
> -
>  TRACE_EVENT(xen_mmu_set_pte_at,
>  	    TP_PROTO(struct mm_struct *mm, unsigned long addr,
>  		     pte_t *ptep, pte_t pteval),

Re: [PATCH 2/3] xen: remove unused function xen_set_domain_pte()

[Steven Rostedt]

On Fri, 4 Aug 2017 15:20:30 -0400
Boris Ostrovsky <boris.ostrovsky@oracle.com> wrote:

> On 08/04/2017 07:36 AM, Juergen Gross wrote:
> > The function xen_set_domain_pte() is used nowhere in the kernel.
> > Remove it.
> >
> > Signed-off-by: Juergen Gross <jgross@suse.com>  
> 
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> 
> (+ Ingo and Steven who are maintainers of include/trace/events/xen.h)

But the maintainers of where the tracepoints are located have final
say (in this case, the Xen maintainers). I like to be Cc'd to make sure
that the events are efficient and don't waste cpu unnecessary CPU
cycles or memory.

-- Steve

[PATCH 3/3] xen: remove not used trace functions

[Juergen Gross]

There are some Xen specific trace functions defined in
include/trace/events/xen.h. Remove them.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 include/trace/events/xen.h | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
index 677e8ac2bb81..1b4fed72f573 100644
--- a/include/trace/events/xen.h
+++ b/include/trace/events/xen.h
@@ -248,16 +248,6 @@ TRACE_EVENT(xen_mmu_set_p4d,
 		      (int)sizeof(p4dval_t) * 2, (unsigned long long)pgd_val(native_make_pgd(__entry->p4dval)),
 		      (int)sizeof(p4dval_t) * 2, (unsigned long long)__entry->p4dval)
 	);
-
-TRACE_EVENT(xen_mmu_pud_clear,
-	    TP_PROTO(pud_t *pudp),
-	    TP_ARGS(pudp),
-	    TP_STRUCT__entry(
-		    __field(pud_t *, pudp)
-		    ),
-	    TP_fast_assign(__entry->pudp = pudp),
-	    TP_printk("pudp %p", __entry->pudp)
-	);
 #else
 
 TRACE_EVENT(xen_mmu_set_pud,
@@ -277,16 +267,6 @@ TRACE_EVENT(xen_mmu_set_pud,
 
 #endif
 
-TRACE_EVENT(xen_mmu_pgd_clear,
-	    TP_PROTO(pgd_t *pgdp),
-	    TP_ARGS(pgdp),
-	    TP_STRUCT__entry(
-		    __field(pgd_t *, pgdp)
-		    ),
-	    TP_fast_assign(__entry->pgdp = pgdp),
-	    TP_printk("pgdp %p", __entry->pgdp)
-	);
-
 DECLARE_EVENT_CLASS(xen_mmu_ptep_modify_prot,
 	    TP_PROTO(struct mm_struct *mm, unsigned long addr,
 		     pte_t *ptep, pte_t pteval),
-- 
2.12.3

Re: [PATCH 3/3] xen: remove not used trace functions

[Boris Ostrovsky]

On 08/04/2017 07:36 AM, Juergen Gross wrote:
> There are some Xen specific trace functions defined in
> include/trace/events/xen.h. Remove them.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>

(Again, adding Ingo and Steven)

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

although I think "s/some Xen/some unused Xen/" in the commit message
would make it clearer.

> ---
>  include/trace/events/xen.h | 20 --------------------
>  1 file changed, 20 deletions(-)
>
> diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
> index 677e8ac2bb81..1b4fed72f573 100644
> --- a/include/trace/events/xen.h
> +++ b/include/trace/events/xen.h
> @@ -248,16 +248,6 @@ TRACE_EVENT(xen_mmu_set_p4d,
>  		      (int)sizeof(p4dval_t) * 2, (unsigned long long)pgd_val(native_make_pgd(__entry->p4dval)),
>  		      (int)sizeof(p4dval_t) * 2, (unsigned long long)__entry->p4dval)
>  	);
> -
> -TRACE_EVENT(xen_mmu_pud_clear,
> -	    TP_PROTO(pud_t *pudp),
> -	    TP_ARGS(pudp),
> -	    TP_STRUCT__entry(
> -		    __field(pud_t *, pudp)
> -		    ),
> -	    TP_fast_assign(__entry->pudp = pudp),
> -	    TP_printk("pudp %p", __entry->pudp)
> -	);
>  #else
>  
>  TRACE_EVENT(xen_mmu_set_pud,
> @@ -277,16 +267,6 @@ TRACE_EVENT(xen_mmu_set_pud,
>  
>  #endif
>  
> -TRACE_EVENT(xen_mmu_pgd_clear,
> -	    TP_PROTO(pgd_t *pgdp),
> -	    TP_ARGS(pgdp),
> -	    TP_STRUCT__entry(
> -		    __field(pgd_t *, pgdp)
> -		    ),
> -	    TP_fast_assign(__entry->pgdp = pgdp),
> -	    TP_printk("pgdp %p", __entry->pgdp)
> -	);
> -
>  DECLARE_EVENT_CLASS(xen_mmu_ptep_modify_prot,
>  	    TP_PROTO(struct mm_struct *mm, unsigned long addr,
>  		     pte_t *ptep, pte_t pteval),

Re: [PATCH 3/3] xen: remove not used trace functions

[Steven Rostedt]

On Fri, 4 Aug 2017 15:35:06 -0400
Boris Ostrovsky <boris.ostrovsky@oracle.com> wrote:

> On 08/04/2017 07:36 AM, Juergen Gross wrote:
> > There are some Xen specific trace functions defined in
> > include/trace/events/xen.h. Remove them.
> >
> > Signed-off-by: Juergen Gross <jgross@suse.com>  
> 
> (Again, adding Ingo and Steven)

Feel free to add:

Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

to both.

-- Steve

> 
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> 
> although I think "s/some Xen/some unused Xen/" in the commit message
> would make it clearer.
> 

Re: [PATCH 0/3] xen: do some cleanups

[Boris Ostrovsky]

On 08/04/2017 07:36 AM, Juergen Gross wrote:
> Remove stuff no longer needed.
>
> Juergen Gross (3):
>   xen: remove tests for pvh mode in pure pv paths
>   xen: remove unused function xen_set_domain_pte()
>   xen: remove not used trace functions
>
>  arch/x86/include/asm/xen/page.h |  5 -----
>  arch/x86/xen/mmu_pv.c           | 20 --------------------
>  arch/x86/xen/p2m.c              | 25 +------------------------
>  arch/x86/xen/setup.c            |  5 +----
>  include/trace/events/xen.h      | 38 --------------------------------------
>  5 files changed, 2 insertions(+), 91 deletions(-)
>

Applied to for-linus-4.14.

-boris