Hello,
This patch adds FreeBSD mappings heuristics to allow faster page promotion.
Also, remove code for unsync va heuristic, not needed anymore.
I admit the guest heuristic are getting too long, but this can be fixed
in the future.
Gianluca
Signed-off-by: Gianluca Guida <gianluca.guida@xxxxxxxxxxxxx>
diff -r 5274aa966231 xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c Fri Sep 26 11:12:29 2008 +0100
+++ b/xen/arch/x86/mm/shadow/common.c Fri Sep 26 14:27:11 2008 +0100
@@ -2343,9 +2343,6 @@ int sh_remove_write_access(struct vcpu *
return 1; \
} \
} while (0)
-
- if ( level == 0 && fault_addr )
- GUESS(fault_addr, 6);
if ( v->arch.paging.mode->guest_levels == 2 )
{
@@ -2357,6 +2354,10 @@ int sh_remove_write_access(struct vcpu *
if ((gfn = mfn_to_gfn(v->domain, gmfn)) < 0x38000 )
GUESS(0xC0000000UL + (gfn << PAGE_SHIFT), 4);
+ /* FreeBSD: Linear map at 0xBFC00000 */
+ if ( level == 1 )
+ GUESS(0xBFC00000UL
+ + ((fault_addr & VADDR_MASK) >> 10), 6);
}
else if ( v->arch.paging.mode->guest_levels == 3 )
{
@@ -2370,6 +2371,15 @@ int sh_remove_write_access(struct vcpu *
/* Linux lowmem: first 896MB is mapped 1-to-1 above 0xC0000000 */
if ((gfn = mfn_to_gfn(v->domain, gmfn)) < 0x38000 )
GUESS(0xC0000000UL + (gfn << PAGE_SHIFT), 4);
+
+ /* FreeBSD PAE: Linear map at 0xBF800000 */
+ switch ( level )
+ {
+ case 1: GUESS(0xBF800000UL
+ + ((fault_addr & VADDR_MASK) >> 9), 6); break;
+ case 2: GUESS(0xBFDFC000UL
+ + ((fault_addr & VADDR_MASK) >> 18), 6); break;
+ }
}
#if CONFIG_PAGING_LEVELS >= 4
else if ( v->arch.paging.mode->guest_levels == 4 )
@@ -2392,11 +2402,25 @@ int sh_remove_write_access(struct vcpu *
GUESS(0xffff880000000000UL + (gfn << PAGE_SHIFT), 4);
GUESS(0xffff810000000000UL + (gfn << PAGE_SHIFT), 4);
GUESS(0x0000010000000000UL + (gfn << PAGE_SHIFT), 4);
+
/*
* 64bit Solaris kernel page map at
* kpm_vbase; 0xfffffe0000000000UL
*/
GUESS(0xfffffe0000000000UL + (gfn << PAGE_SHIFT), 4);
+
+ /* FreeBSD 64bit: linear map 0xffff800000000000 */
+ switch ( level )
+ {
+ case 1: GUESS(0xffff800000000000
+ + ((fault_addr & VADDR_MASK) >> 9), 6); break;
+ case 2: GUESS(0xffff804000000000UL
+ + ((fault_addr & VADDR_MASK) >> 18), 6); break;
+ case 3: GUESS(0xffff804020000000UL
+ + ((fault_addr & VADDR_MASK) >> 27), 6); break;
+ }
+ /* FreeBSD 64bit: direct map at 0xffffff0000000000 */
+ GUESS(0xffffff0000000000 + (gfn << PAGE_SHIFT), 6);
}
#endif /* CONFIG_PAGING_LEVELS >= 4 */
diff -r 5274aa966231 xen/include/asm-x86/perfc_defn.h
--- a/xen/include/asm-x86/perfc_defn.h Fri Sep 26 11:12:29 2008 +0100
+++ b/xen/include/asm-x86/perfc_defn.h Fri Sep 26 14:27:11 2008 +0100
@@ -80,7 +80,7 @@ PERFCOUNTER(shadow_writeable_h_3, "shad
PERFCOUNTER(shadow_writeable_h_3, "shadow writeable: 64b w2k3")
PERFCOUNTER(shadow_writeable_h_4, "shadow writeable: linux low/solaris")
PERFCOUNTER(shadow_writeable_h_5, "shadow writeable: linux high")
-PERFCOUNTER(shadow_writeable_h_6, "shadow writeable: unsync va")
+PERFCOUNTER(shadow_writeable_h_6, "shadow writeable: FreeBSD")
PERFCOUNTER(shadow_writeable_h_7, "shadow writeable: sl1p")
PERFCOUNTER(shadow_writeable_h_8, "shadow writeable: sl1p failed")
PERFCOUNTER(shadow_writeable_bf, "shadow writeable brute-force")
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