xen: allow privcmd for HVM guests (1a1d4331) · Commits · 戴 / test

This patch removes the "return -ENOSYS" for auto_translated_physmap guests from privcmd_mmap, thus it allows ARM guests to issue privcmd mmap calls. However privcmd mmap calls are still going to fail for HVM and hybrid guests on x86 because the xen_remap_domain_mfn_range implementation is currently PV only. Changes in v2: - better commit message; - return -EINVAL from xen_remap_domain_mfn_range if auto_translated_physmap. Signed-off-by:

Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by:

Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by:

Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

arch/x86/xen/mmu.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -2310,6 +2310,9 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
		unsigned long range;
		int err = 0;

		if (xen_feature(XENFEAT_auto_translated_physmap))
		return -EINVAL;

		prot = __pgprot(pgprot_val(prot) \| _PAGE_IOMAP);

		BUG_ON(!((vma->vm_flags & (VM_PFNMAP \| VM_RESERVED \| VM_IO)) ==

drivers/xen/privcmd.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -380,10 +380,6 @@ static struct vm_operations_struct privcmd_vm_ops = {

		static int privcmd_mmap(struct file file, struct vm_area_struct vma)
		{
		/* Unsupported for auto-translate guests. */
		if (xen_feature(XENFEAT_auto_translated_physmap))
		return -ENOSYS;

		/* DONTCOPY is essential for Xen because copy_page_range doesn't know
		* how to recreate these mappings */
		vma->vm_flags \|= VM_RESERVED \| VM_IO \| VM_DONTCOPY \| VM_PFNMAP;

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