From: Tamas K Lengyel Date: Fri, 26 Mar 2021 15:17:07 +0000 (+0100) Subject: x86/mem_sharing: copy parent VM's hostp2m's max_mapped_pfn during forking X-Git-Tag: archive/raspbian/4.16.0+51-g0941d6cb-1+rpi1~2^2~42^2~798 X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=f10c41537113dc2406c26cdf134403864df02a7d;p=xen.git x86/mem_sharing: copy parent VM's hostp2m's max_mapped_pfn during forking When creating a VM fork copy the parent VM's hostp2m max_mapped_pfn value. Some toolstack relies on the XENMEM_maximum_gpfn value to establish the maximum addressable physical memory in the VM and for forks that have not yet been unpaused that value is not going to reflect the correct max gpfn that's possible to populate into the p2m. This patch fixes the issue. Signed-off-by: Tamas K Lengyel Reviewed-by: Andrew Cooper Release-Acked-by: Ian Jackson --- diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c index 00ada05c10..98b14f7b0a 100644 --- a/xen/arch/x86/mm/mem_sharing.c +++ b/xen/arch/x86/mm/mem_sharing.c @@ -1761,6 +1761,7 @@ static int copy_settings(struct domain *cd, struct domain *d) return rc; copy_tsc(cd, d); + p2m_get_hostp2m(cd)->max_mapped_pfn = p2m_get_hostp2m(d)->max_mapped_pfn; return rc; }