[xen master] xen/riscv: Implement ARCH_PAGING_MEMPOOL

[patchbot@xxxxxxx]

commit a8606445b129bfd515b74acd5ce7f078e3353b51
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Mon Aug 3 09:49:43 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Aug 3 09:49:43 2026 +0200

    xen/riscv: Implement ARCH_PAGING_MEMPOOL
    
    The p2m_freelist is used to allocate pages for the P2M. To initialize
    this list, domain_p2m_set_allocation() may be called from construct_domU()
    in the common Dom0less code, so RISC-V provides an implementation and
    enables CONFIG_ARCH_PAGING_MEMPOOL unconditionally.
    
    Additionally, implement arch_{set,get}_paging_mempool_size(). They are
    not directly used yet, but are required to support the
    XEN_DOMCTL_{get,set}_paging_mempool_size hypercalls.
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/riscv/Kconfig |  1 +
 xen/arch/riscv/p2m.c   | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/xen/arch/riscv/Kconfig b/xen/arch/riscv/Kconfig
index 41426c2052..48520588fe 100644
--- a/xen/arch/riscv/Kconfig
+++ b/xen/arch/riscv/Kconfig
@@ -1,5 +1,6 @@
 config RISCV
        def_bool y
+       select ARCH_PAGING_MEMPOOL
        select DOMAIN_BUILD_HELPERS
        select FUNCTION_ALIGNMENT_16B
        select GENERIC_BUG_FRAME
diff --git a/xen/arch/riscv/p2m.c b/xen/arch/riscv/p2m.c
index 566266e3e7..1cea86512c 100644
--- a/xen/arch/riscv/p2m.c
+++ b/xen/arch/riscv/p2m.c
@@ -1600,3 +1600,27 @@ struct page_info *get_page_from_gfn(struct domain *d, 
unsigned long gfn,
 
     return p2m_get_page_from_gfn(p2m_get_hostp2m(d), _gfn(gfn), t);
 }
+
+int arch_set_paging_mempool_size(struct domain *d, uint64_t size)
+{
+    unsigned long pages = PFN_DOWN(size);
+    int rc;
+
+    /* Non page-sized request or 32-bit overflow? */
+    if ( pfn_to_paddr(pages) != size )
+        return -EINVAL;
+
+    spin_lock(&d->arch.paging.lock);
+    rc = p2m_set_allocation(d, pages, true);
+    spin_unlock(&d->arch.paging.lock);
+
+    return rc;
+}
+
+/* Return the size of the pool, in bytes. */
+int arch_get_paging_mempool_size(struct domain *d, uint64_t *size)
+{
+    *size = pfn_to_paddr(ACCESS_ONCE(d->arch.paging.total_pages));
+
+    return 0;
+}
--
generated by git-patchbot for /home/xen/git/xen.git#master