[xen master] Revert "xen/page_alloc: introduce preserved page flags macro"

[patchbot@xxxxxxx]

commit cbe393b709e0c6c3e2b10c3ac69fbea0abd530fe
Author:     Julien Grall <jgrall@xxxxxxxxxx>
AuthorDate: Thu Mar 21 16:02:25 2024 +0000
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Thu Mar 21 16:02:25 2024 +0000

    Revert "xen/page_alloc: introduce preserved page flags macro"
    
    Osstest is reporting a crash:
    
    Mar 21 12:00:29.533676 (XEN) pg[0] MFN 2211c5 c=0x2c00000000000000 o=0 
v=0xe40000010007ffff t=0x24
    Mar 21 12:00:42.829785 (XEN) Xen BUG at common/page_alloc.c:1033
    Mar 21 12:00:42.829829 (XEN) ----[ Xen-4.19-unstable  x86_64  debug=y  Not 
tainted ]----
    Mar 21 12:00:42.829857 (XEN) CPU:    12
    Mar 21 12:00:42.841571 (XEN) RIP:    e008:[<ffff82d04022fe1f>] 
common/page_alloc.c#alloc_heap_pages+0x37f/0x6e2
    Mar 21 12:00:42.841609 (XEN) RFLAGS: 0000000000010282   CONTEXT: hypervisor 
(d0v8)
    Mar 21 12:00:42.853654 (XEN) rax: ffff83023e3ed06c   rbx: 000000000007ffff  
 rcx: 0000000000000028
    Mar 21 12:00:42.853689 (XEN) rdx: ffff83047bec7fff   rsi: ffff83023e3ea3e8  
 rdi: ffff83023e3ea3e0
    Mar 21 12:00:42.865657 (XEN) rbp: ffff83047bec7c10   rsp: ffff83047bec7b98  
 r8:  0000000000000000
    Mar 21 12:00:42.877647 (XEN) r9:  0000000000000001   r10: 000000000000000c  
 r11: 0000000000000010
    Mar 21 12:00:42.877682 (XEN) r12: 0000000000000001   r13: 0000000000000000  
 r14: ffff82e0044238a0
    Mar 21 12:00:42.889652 (XEN) r15: 0000000000000000   cr0: 0000000080050033  
 cr4: 0000000000372660
    Mar 21 12:00:42.901651 (XEN) cr3: 000000046fe34000   cr2: 00007fb72757610b
    Mar 21 12:00:42.901685 (XEN) fsb: 00007fb726def380   gsb: ffff88801f200000  
 gss: 0000000000000000
    Mar 21 12:00:42.913646 (XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   
ss: e010   cs: e008
    Mar 21 12:00:42.913680 (XEN) Xen code around <ffff82d04022fe1f> 
(common/page_alloc.c#alloc_heap_pages+0x37f/0x6e2):
    Mar 21 12:00:42.925645 (XEN)  d1 1c 00 e8 ad dd 02 00 <0f> 0b 48 85 c9 79 
36 0f 0b 41 89 cd 48 c7 47 f0
    Mar 21 12:00:42.937649 (XEN) Xen stack trace from rsp=ffff83047bec7b98:
    Mar 21 12:00:42.937683 (XEN)    0000000000000024 000000007bec7c20 
0000000000000001 ffff83046ccda000
    Mar 21 12:00:42.949653 (XEN)    ffff82e000000021 0000000000000016 
0000000000000000 0000000000000000
    Mar 21 12:00:42.949687 (XEN)    0000000000000000 0000000000000000 
0000000000000028 0000000000000021
    Mar 21 12:00:42.961652 (XEN)    ffff83046ccda000 0000000000000000 
00007d2000000000 ffff83047bec7c48
    Mar 21 12:00:42.961687 (XEN)    ffff82d0402302ff ffff83046ccda000 
0000000000000100 0000000000000000
    Mar 21 12:00:42.973655 (XEN)    ffff82d0405f0080 00007d2000000000 
ffff83047bec7c80 ffff82d0402f626c
    Mar 21 12:00:42.985656 (XEN)    ffff83046ccda000 ffff83046ccda640 
0000000000000000 0000000000000000
    Mar 21 12:00:42.985690 (XEN)    ffff83046ccda220 ffff83047bec7cb0 
ffff82d0402f65a0 ffff83046ccda000
    Mar 21 12:00:42.997662 (XEN)    0000000000000000 0000000000000000 
0000000000000000 ffff83047bec7cc0
    Mar 21 12:00:43.009660 (XEN)    ffff82d040311f8a ffff83047bec7ce0 
ffff82d0402bd543 ffff83046ccda000
    Mar 21 12:00:43.009695 (XEN)    ffff83047bec7dc8 ffff83047bec7d08 
ffff82d04032c524 ffff83046ccda000
    Mar 21 12:00:43.021653 (XEN)    ffff83047bec7dc8 0000000000000002 
ffff83047bec7d58 ffff82d040206750
    Mar 21 12:00:43.033642 (XEN)    0000000000000000 ffff82d040233fe5 
ffff83047bec7d48 0000000000000000
    Mar 21 12:00:43.033678 (XEN)    0000000000000002 00007fb72767f010 
ffff82d0405e9120 0000000000000001
    Mar 21 12:00:43.045654 (XEN)    ffff83047bec7e70 ffff82d040240728 
0000000000000007 ffff83023e3b3000
    Mar 21 12:00:43.045690 (XEN)    0000000000000246 ffff83023e2efa90 
ffff83023e38e000 ffff83023e2efb40
    Mar 21 12:00:43.057609 (XEN)    0000000000000007 ffff83023e3afb80 
0000000000000206 ffff83047bec7dc0
    Mar 21 12:00:43.069662 (XEN)    0000001600000001 000000000000ffff 
e75aaa8d0000000c ac0d6d864e487f62
    Mar 21 12:00:43.069697 (XEN)    000000037fa48d76 0000000200000000 
ffffffff000003ff 00000002ffffffff
    Mar 21 12:00:43.081647 (XEN)    0000000000000000 00000000000001ff 
0000000000000000 0000000000000000
    Mar 21 12:00:43.093646 (XEN) Xen call trace:
    Mar 21 12:00:43.093677 (XEN)    [<ffff82d04022fe1f>] R 
common/page_alloc.c#alloc_heap_pages+0x37f/0x6e2
    Mar 21 12:00:43.093705 (XEN)    [<ffff82d0402302ff>] F 
alloc_domheap_pages+0x17d/0x1e4
    Mar 21 12:00:43.105652 (XEN)    [<ffff82d0402f626c>] F 
hap_set_allocation+0x73/0x23c
    Mar 21 12:00:43.105685 (XEN)    [<ffff82d0402f65a0>] F 
hap_enable+0x138/0x33c
    Mar 21 12:00:43.117646 (XEN)    [<ffff82d040311f8a>] F 
paging_enable+0x2d/0x45
    Mar 21 12:00:43.117679 (XEN)    [<ffff82d0402bd543>] F 
hvm_domain_initialise+0x185/0x428
    Mar 21 12:00:43.129652 (XEN)    [<ffff82d04032c524>] F 
arch_domain_create+0x3e7/0x4c1
    Mar 21 12:00:43.129687 (XEN)    [<ffff82d040206750>] F 
domain_create+0x4cc/0x7e2
    Mar 21 12:00:43.141665 (XEN)    [<ffff82d040240728>] F 
do_domctl+0x1850/0x192d
    Mar 21 12:00:43.141699 (XEN)    [<ffff82d04031a96a>] F 
pv_hypercall+0x617/0x6b5
    Mar 21 12:00:43.153656 (XEN)    [<ffff82d0402012ca>] F 
lstar_enter+0x13a/0x140
    Mar 21 12:00:43.153689 (XEN)
    Mar 21 12:00:43.153711 (XEN)
    Mar 21 12:00:43.153731 (XEN) ****************************************
    Mar 21 12:00:43.165647 (XEN) Panic on CPU 12:
    Mar 21 12:00:43.165678 (XEN) Xen BUG at common/page_alloc.c:1033
    Mar 21 12:00:43.165703 (XEN) ****************************************
    Mar 21 12:00:43.177633 (XEN)
    Mar 21 12:00:43.177662 (XEN) Manual reset required ('noreboot' specified)
    
    This reverts commit 75214d5e53f60a7b19e90ebdb090c20044a052ca.
    
    Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/common/page_alloc.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index a1c57fe1d9..28c510d666 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -157,7 +157,6 @@
 #define PGC_static 0
 #endif
 
-#define PGC_preserved (PGC_extra | PGC_static)
 #define PGC_no_buddy_merge PGC_static
 
 #ifndef PGT_TYPE_INFO_INITIALIZER
@@ -1426,11 +1425,11 @@ static bool mark_page_free(struct page_info *pg, mfn_t 
mfn)
     {
     case PGC_state_inuse:
         BUG_ON(pg->count_info & PGC_broken);
-        pg->count_info = PGC_state_free | (pg->count_info & PGC_preserved);
+        pg->count_info = PGC_state_free;
         break;
 
     case PGC_state_offlining:
-        pg->count_info = (pg->count_info & (PGC_broken | PGC_preserved)) |
+        pg->count_info = (pg->count_info & PGC_broken) |
                          PGC_state_offlined;
         pg_offlined = true;
         break;
@@ -2365,7 +2364,7 @@ int assign_pages(
 
         for ( i = 0; i < nr; i++ )
         {
-            ASSERT(!(pg[i].count_info & ~PGC_preserved));
+            ASSERT(!(pg[i].count_info & ~(PGC_extra | PGC_static)));
             if ( pg[i].count_info & PGC_extra )
                 extra_pages++;
         }
@@ -2425,7 +2424,7 @@ int assign_pages(
         page_set_owner(&pg[i], d);
         smp_wmb(); /* Domain pointer must be visible before updating refcnt. */
         pg[i].count_info =
-            (pg[i].count_info & PGC_preserved) | PGC_allocated | 1;
+            (pg[i].count_info & (PGC_extra | PGC_static)) | PGC_allocated | 1;
 
         page_list_add_tail(&pg[i], page_to_list(d, &pg[i]));
     }
--
generated by git-patchbot for /home/xen/git/xen.git#master