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Re: [PATCH v2 3/3] x86/PVH: Support relocatable dom0 kernels
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Wed, 13 Mar 2024 17:02:56 -0400
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Wed, 13 Mar 2024 21:11:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2024-03-13 15:30, Jason Andryuk wrote:
+/* Find an e820 RAM region that fits the kernel at a suitable alignment. */
+static paddr_t __init find_kernel_memory(
+ const struct domain *d, struct elf_binary *elf,
+ const struct elf_dom_parms *parms)
+{
+ paddr_t kernel_start = (paddr_t)elf->dest_base & PAGE_MASK;
+ paddr_t kernel_end = PAGE_ALIGN((paddr_t)elf->dest_base + elf->dest_size);
+ paddr_t kernel_size = kernel_end - kernel_start;
+ unsigned int i;
+
+ /*
+ * The memory map is sorted and all RAM regions starts and sizes are
+ * aligned to page boundaries.
+ */
+ for ( i = 0; i < d->arch.nr_e820; i++ )
+ {
+ paddr_t start = d->arch.e820[i].addr;
+ paddr_t end = d->arch.e820[i].addr + d->arch.e820[i].size;
+ paddr_t kstart, kend;
+
+ if ( d->arch.e820[i].type != E820_RAM )
+ continue;
+
+ if ( d->arch.e820[i].size < kernel_size )
+ continue;
+
+ kstart = ROUNDUP(start, parms->phys_align);
+ kstart = kstart < parms->phys_min ? parms->phys_min : kstart;
This should be
kstart = MAX(kstart, parms->phys_min);
Regards,
Jason
+ kend = kstart + kernel_size;
+
+ if ( kend > parms->phys_max )
+ return 0;
+
+ if ( kend <= end )
+ return kstart;
+ }
+
+ return 0;
+}
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