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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86: Clean up arch_set_info_guest() by having HVM VCPUs bail early.
# HG changeset patch
# User Keir Fraser <keir@xxxxxxxxxxxxx>
# Date 1191248898 -3600
# Node ID 22273a5336e50ca38198f4d2ab6b20b27a856221
# Parent 772674585a1a367095fe326b8a659f674099a241
x86: Clean up arch_set_info_guest() by having HVM VCPUs bail early.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
xen/arch/x86/domain.c | 156 ++++++++++++++++++++++++--------------------------
1 files changed, 77 insertions(+), 79 deletions(-)
diff -r 772674585a1a -r 22273a5336e5 xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c Mon Oct 01 15:12:05 2007 +0100
+++ b/xen/arch/x86/domain.c Mon Oct 01 15:28:18 2007 +0100
@@ -645,21 +645,21 @@ int arch_set_info_guest(
v->arch.guest_context.user_regs.eflags |= 2;
+ if ( is_hvm_vcpu(v) )
+ goto out;
+
/* Only CR0.TS is modifiable by guest or admin. */
v->arch.guest_context.ctrlreg[0] &= X86_CR0_TS;
v->arch.guest_context.ctrlreg[0] |= read_cr0() & ~X86_CR0_TS;
init_int80_direct_trap(v);
- if ( !is_hvm_vcpu(v) )
- {
- /* IOPL privileges are virtualised. */
- v->arch.iopl = (v->arch.guest_context.user_regs.eflags >> 12) & 3;
- v->arch.guest_context.user_regs.eflags &= ~EF_IOPL;
-
- /* Ensure real hardware interrupts are enabled. */
- v->arch.guest_context.user_regs.eflags |= EF_IE;
- }
+ /* IOPL privileges are virtualised. */
+ v->arch.iopl = (v->arch.guest_context.user_regs.eflags >> 12) & 3;
+ v->arch.guest_context.user_regs.eflags &= ~EF_IOPL;
+
+ /* Ensure real hardware interrupts are enabled. */
+ v->arch.guest_context.user_regs.eflags |= EF_IE;
if ( v->is_initialised )
goto out;
@@ -672,29 +672,44 @@ int arch_set_info_guest(
if ( v->vcpu_id == 0 )
d->vm_assist = c(vm_assist);
- if ( !is_hvm_vcpu(v) )
- {
- if ( !compat )
- rc = (int)set_gdt(v, c.nat->gdt_frames, c.nat->gdt_ents);
+ if ( !compat )
+ rc = (int)set_gdt(v, c.nat->gdt_frames, c.nat->gdt_ents);
#ifdef CONFIG_COMPAT
- else
- {
- unsigned long gdt_frames[ARRAY_SIZE(c.cmp->gdt_frames)];
- unsigned int i, n = (c.cmp->gdt_ents + 511) / 512;
-
- if ( n > ARRAY_SIZE(c.cmp->gdt_frames) )
- return -EINVAL;
- for ( i = 0; i < n; ++i )
- gdt_frames[i] = c.cmp->gdt_frames[i];
- rc = (int)set_gdt(v, gdt_frames, c.cmp->gdt_ents);
- }
-#endif
- if ( rc != 0 )
- return rc;
-
- if ( !compat )
- {
- cr3_pfn = gmfn_to_mfn(d, xen_cr3_to_pfn(c.nat->ctrlreg[3]));
+ else
+ {
+ unsigned long gdt_frames[ARRAY_SIZE(c.cmp->gdt_frames)];
+ unsigned int i, n = (c.cmp->gdt_ents + 511) / 512;
+
+ if ( n > ARRAY_SIZE(c.cmp->gdt_frames) )
+ return -EINVAL;
+ for ( i = 0; i < n; ++i )
+ gdt_frames[i] = c.cmp->gdt_frames[i];
+ rc = (int)set_gdt(v, gdt_frames, c.cmp->gdt_ents);
+ }
+#endif
+ if ( rc != 0 )
+ return rc;
+
+ if ( !compat )
+ {
+ cr3_pfn = gmfn_to_mfn(d, xen_cr3_to_pfn(c.nat->ctrlreg[3]));
+
+ if ( !mfn_valid(cr3_pfn) ||
+ (paging_mode_refcounts(d)
+ ? !get_page(mfn_to_page(cr3_pfn), d)
+ : !get_page_and_type(mfn_to_page(cr3_pfn), d,
+ PGT_base_page_table)) )
+ {
+ destroy_gdt(v);
+ return -EINVAL;
+ }
+
+ v->arch.guest_table = pagetable_from_pfn(cr3_pfn);
+
+#ifdef __x86_64__
+ if ( c.nat->ctrlreg[1] )
+ {
+ cr3_pfn = gmfn_to_mfn(d, xen_cr3_to_pfn(c.nat->ctrlreg[1]));
if ( !mfn_valid(cr3_pfn) ||
(paging_mode_refcounts(d)
@@ -702,59 +717,42 @@ int arch_set_info_guest(
: !get_page_and_type(mfn_to_page(cr3_pfn), d,
PGT_base_page_table)) )
{
+ cr3_pfn = pagetable_get_pfn(v->arch.guest_table);
+ v->arch.guest_table = pagetable_null();
+ if ( paging_mode_refcounts(d) )
+ put_page(mfn_to_page(cr3_pfn));
+ else
+ put_page_and_type(mfn_to_page(cr3_pfn));
destroy_gdt(v);
return -EINVAL;
}
- v->arch.guest_table = pagetable_from_pfn(cr3_pfn);
-
-#ifdef __x86_64__
- if ( c.nat->ctrlreg[1] )
- {
- cr3_pfn = gmfn_to_mfn(d, xen_cr3_to_pfn(c.nat->ctrlreg[1]));
-
- if ( !mfn_valid(cr3_pfn) ||
- (paging_mode_refcounts(d)
- ? !get_page(mfn_to_page(cr3_pfn), d)
- : !get_page_and_type(mfn_to_page(cr3_pfn), d,
- PGT_base_page_table)) )
- {
- cr3_pfn = pagetable_get_pfn(v->arch.guest_table);
- v->arch.guest_table = pagetable_null();
- if ( paging_mode_refcounts(d) )
- put_page(mfn_to_page(cr3_pfn));
- else
- put_page_and_type(mfn_to_page(cr3_pfn));
- destroy_gdt(v);
- return -EINVAL;
- }
-
- v->arch.guest_table_user = pagetable_from_pfn(cr3_pfn);
- }
-#endif
- }
+ v->arch.guest_table_user = pagetable_from_pfn(cr3_pfn);
+ }
+#endif
+ }
#ifdef CONFIG_COMPAT
- else
- {
- l4_pgentry_t *l4tab;
-
- cr3_pfn = gmfn_to_mfn(d, compat_cr3_to_pfn(c.cmp->ctrlreg[3]));
-
- if ( !mfn_valid(cr3_pfn) ||
- (paging_mode_refcounts(d)
- ? !get_page(mfn_to_page(cr3_pfn), d)
- : !get_page_and_type(mfn_to_page(cr3_pfn), d,
- PGT_l3_page_table)) )
- {
- destroy_gdt(v);
- return -EINVAL;
- }
-
- l4tab = __va(pagetable_get_paddr(v->arch.guest_table));
- *l4tab = l4e_from_pfn(cr3_pfn,
_PAGE_PRESENT|_PAGE_RW|_PAGE_USER|_PAGE_ACCESSED);
- }
-#endif
- }
+ else
+ {
+ l4_pgentry_t *l4tab;
+
+ cr3_pfn = gmfn_to_mfn(d, compat_cr3_to_pfn(c.cmp->ctrlreg[3]));
+
+ if ( !mfn_valid(cr3_pfn) ||
+ (paging_mode_refcounts(d)
+ ? !get_page(mfn_to_page(cr3_pfn), d)
+ : !get_page_and_type(mfn_to_page(cr3_pfn), d,
+ PGT_l3_page_table)) )
+ {
+ destroy_gdt(v);
+ return -EINVAL;
+ }
+
+ l4tab = __va(pagetable_get_paddr(v->arch.guest_table));
+ *l4tab = l4e_from_pfn(
+ cr3_pfn, _PAGE_PRESENT|_PAGE_RW|_PAGE_USER|_PAGE_ACCESSED);
+ }
+#endif
if ( v->vcpu_id == 0 )
update_domain_wallclock_time(d);
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