Message ID | 20170223163131.vjxfco3ip3pmap2v@dhcp-3-221.uk.xensource.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
diff --git a/xen/arch/x86/domain_build.c b/xen/arch/x86/domain_build.c index adc4c00..4d7f4ae 100644 --- a/xen/arch/x86/domain_build.c +++ b/xen/arch/x86/domain_build.c @@ -51,6 +51,11 @@ static long __initdata dom0_max_nrpages = LONG_MAX; * - 128 bytes I/O bitmap * - one trailing byte * or a total of 265 bytes. + * + * NB: as PVHv2 Dom0 doesn't have legacy devices (ISA), it shouldn't have any + * business in accessing the ISA port range, much less in real mode, and due to + * the lack of firmware it shouldn't also execute any INT instruction. This is + * done for consistency with what hvmloader does. */ #define HVM_VM86_TSS_SIZE 265