[Xen-devel] [PATCH v4 4/4] libxc/x86/pvh: Allow creation of 32b PVH guests

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 tools/libxc/xc_dom_x86.c | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/tools/libxc/xc_dom_x86.c b/tools/libxc/xc_dom_x86.c
index 3d40fa4..05fb0ce 100644
--- a/tools/libxc/xc_dom_x86.c
+++ b/tools/libxc/xc_dom_x86.c
@@ -300,7 +300,8 @@ static int setup_pgtables_x86_32_pae(struct xc_dom_image 
*dom)
         pgpfn = (addr - dom->parms.virt_base) >> PAGE_SHIFT_X86;
         l1tab[l1off] =
             pfn_to_paddr(xc_dom_p2m_guest(dom, pgpfn)) | L1_PROT;
-        if ( (addr >= dom->pgtables_seg.vstart) &&
+        if ( (!dom->pvh_enabled)                &&
+             (addr >= dom->pgtables_seg.vstart) &&
              (addr < dom->pgtables_seg.vend) )
             l1tab[l1off] &= ~_PAGE_RW; /* page tables are r/o */
 
@@ -590,22 +591,9 @@ static int vcpu_x86_32(struct xc_dom_image *dom, void *ptr)
 
     DOMPRINTF_CALLED(dom->xch);
 
-    if ( dom->pvh_enabled )
-    {
-        xc_dom_panic(dom->xch, XC_INTERNAL_ERROR,
-                     "%s: PVH not supported for 32bit guests.", __FUNCTION__);
-        return -1;
-    }
-
     /* clear everything */
     memset(ctxt, 0, sizeof(*ctxt));
 
-    ctxt->user_regs.ds = FLAT_KERNEL_DS_X86_32;
-    ctxt->user_regs.es = FLAT_KERNEL_DS_X86_32;
-    ctxt->user_regs.fs = FLAT_KERNEL_DS_X86_32;
-    ctxt->user_regs.gs = FLAT_KERNEL_DS_X86_32;
-    ctxt->user_regs.ss = FLAT_KERNEL_SS_X86_32;
-    ctxt->user_regs.cs = FLAT_KERNEL_CS_X86_32;
     ctxt->user_regs.eip = dom->parms.virt_entry;
     ctxt->user_regs.esp =
         dom->parms.virt_base + (dom->bootstack_pfn + 1) * PAGE_SIZE_X86;
@@ -613,9 +601,6 @@ static int vcpu_x86_32(struct xc_dom_image *dom, void *ptr)
         dom->parms.virt_base + (dom->start_info_pfn) * PAGE_SIZE_X86;
     ctxt->user_regs.eflags = 1 << 9; /* Interrupt Enable */
 
-    ctxt->kernel_ss = ctxt->user_regs.ss;
-    ctxt->kernel_sp = ctxt->user_regs.esp;
-
     ctxt->flags = VGCF_in_kernel_X86_32 | VGCF_online_X86_32;
     if ( dom->parms.pae == 2 /* extended_cr3 */ ||
          dom->parms.pae == 3 /* bimodal */ )
@@ -626,6 +611,19 @@ static int vcpu_x86_32(struct xc_dom_image *dom, void *ptr)
     DOMPRINTF("%s: cr3: pfn 0x%" PRIpfn " mfn 0x%" PRIpfn "",
               __FUNCTION__, dom->pgtables_seg.pfn, cr3_pfn);
 
+    if ( dom->pvh_enabled )
+        return 0;
+
+    ctxt->user_regs.ds = FLAT_KERNEL_DS_X86_32;
+    ctxt->user_regs.es = FLAT_KERNEL_DS_X86_32;
+    ctxt->user_regs.fs = FLAT_KERNEL_DS_X86_32;
+    ctxt->user_regs.gs = FLAT_KERNEL_DS_X86_32;
+    ctxt->user_regs.ss = FLAT_KERNEL_SS_X86_32;
+    ctxt->user_regs.cs = FLAT_KERNEL_CS_X86_32;
+
+    ctxt->kernel_ss = ctxt->user_regs.ss;
+    ctxt->kernel_sp = ctxt->user_regs.esp;
+
     return 0;
 }
 
-- 
1.8.1.4


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