[Xen-ia64-devel] [PATCH 3/16] domheap: allocate shared_info page from domain heap.

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

# HG changeset patch
# User yamahata@xxxxxxxxxxxxx
# Date 1198237319 -32400
# Node ID 7f1e2deaf58ced913fc50b23cb561f88c7d89eaf
# Parent  5db0f48672ca10b003132842965e5fb0e9eaeb0a
allocate shared_info page from domain heap.
Hyperprivops are where accessing shared_info page with psr.ic = 0.
They are accessing the page via current_psr_i_addr.
We can set it to shared_info_va which is mapped by IA64_TR_SHARED_INFO.
Thus we can allocate the page form domain heap
PATCHNAME: shared_info_from_domain_heap

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r 5db0f48672ca -r 7f1e2deaf58c xen/arch/ia64/xen/domain.c
--- a/xen/arch/ia64/xen/domain.c        Fri Dec 21 17:45:05 2007 +0900
+++ b/xen/arch/ia64/xen/domain.c        Fri Dec 21 20:41:59 2007 +0900
@@ -211,8 +211,9 @@ void schedule_tail(struct vcpu *prev)
                load_region_regs(current);
                ia64_set_pta(vcpu_pta(current));
                vcpu_load_kernel_regs(current);
-               __ia64_per_cpu_var(current_psr_i_addr) = &current->domain->
-                 shared_info->vcpu_info[current->vcpu_id].evtchn_upcall_mask;
+               __ia64_per_cpu_var(current_psr_i_addr) =
+                       (uint8_t*)(current->domain->arch.shared_info_va +
+                                  INT_ENABLE_OFFSET(current));
                __ia64_per_cpu_var(current_psr_ic_addr) = (int *)
                  (current->domain->arch.shared_info_va + XSI_PSR_IC_OFS);
                migrate_timer(&current->arch.hlt_timer, current->processor);
@@ -279,8 +280,9 @@ void context_switch(struct vcpu *prev, s
             vcpu_set_next_timer(current);
             if (vcpu_timer_expired(current))
                 vcpu_pend_timer(current);
-            __ia64_per_cpu_var(current_psr_i_addr) = &nd->shared_info->
-                vcpu_info[current->vcpu_id].evtchn_upcall_mask;
+           __ia64_per_cpu_var(current_psr_i_addr) =
+                   (uint8_t*)(nd->arch.shared_info_va +
+                              INT_ENABLE_OFFSET(current));
             __ia64_per_cpu_var(current_psr_ic_addr) =
                 (int *)(nd->arch.shared_info_va + XSI_PSR_IC_OFS);
             /* steal time accounting */
@@ -556,6 +558,7 @@ int arch_domain_create(struct domain *d)
 int arch_domain_create(struct domain *d)
 {
        int i;
+       struct page_info *page = NULL;
        
        // the following will eventually need to be negotiated dynamically
        d->arch.shared_info_va = DEFAULT_SHAREDINFO_ADDR;
@@ -575,9 +578,11 @@ int arch_domain_create(struct domain *d)
 #endif
        if (tlb_track_create(d) < 0)
                goto fail_nomem1;
-       d->shared_info = alloc_xenheap_pages(get_order_from_shift(XSI_SHIFT));
-       if (d->shared_info == NULL)
-           goto fail_nomem;
+       page = alloc_domheap_pages(NULL, get_order_from_shift(XSI_SHIFT), 0);
+       if (page == NULL)
+               goto fail_nomem;
+       d->shared_info = page_to_virt(page);
+       BUG_ON(d->shared_info == NULL);
        memset(d->shared_info, 0, XSI_SIZE);
        for (i = 0; i < XSI_SIZE; i += PAGE_SIZE)
            share_xen_page_with_guest(virt_to_page((char *)d->shared_info + i),
@@ -619,17 +624,18 @@ fail_nomem1:
 fail_nomem1:
        if (d->arch.mm.pgd != NULL)
            pgd_free(d->arch.mm.pgd);
+       if (page != NULL)
+           free_domheap_pages(page, get_order_from_shift(XSI_SHIFT));
+       return -ENOMEM;
+}
+
+void arch_domain_destroy(struct domain *d)
+{
+       mm_final_teardown(d);
+
        if (d->shared_info != NULL)
-           free_xenheap_pages(d->shared_info, get_order_from_shift(XSI_SHIFT));
-       return -ENOMEM;
-}
-
-void arch_domain_destroy(struct domain *d)
-{
-       mm_final_teardown(d);
-
-       if (d->shared_info != NULL)
-           free_xenheap_pages(d->shared_info, get_order_from_shift(XSI_SHIFT));
+               free_domheap_pages(virt_to_page(d->shared_info),
+                                  get_order_from_shift(XSI_SHIFT));
 
        tlb_track_destroy(d);
 
@@ -1700,6 +1706,8 @@ domain_set_shared_info_va (unsigned long
        VCPU(v, interrupt_mask_addr) = (unsigned char *)va +
                                       INT_ENABLE_OFFSET(v);
 
+       __ia64_per_cpu_var(current_psr_i_addr) =
+               (uint8_t*)(va + INT_ENABLE_OFFSET(current));
        __ia64_per_cpu_var(current_psr_ic_addr) = (int *)(va + XSI_PSR_IC_OFS);
 
        /* Remap the shared pages.  */

Attachment: 16697_7f1e2deaf58c_shared_info_from_domain_heap.patch
Description: Text Data

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