Re: [RFC PATCH v3 07/38] xen-platform: allow its creation with XEN_EMULATE mode

[David Woodhouse]

On 20 December 2022 16:19:54 GMT, Paul Durrant <xadimgnik@gmail.com> wrote:
>On 16/12/2022 00:40, David Woodhouse wrote:
>> From: Joao Martins <joao.m.martins@oracle.com>
>> 
>> The only thing we need to handle on KVM side is to change the
>> pfn from R/W to R/O.
>> 
>> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
>> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
>> ---
>>   hw/i386/xen/xen_platform.c | 11 ++++-------
>>   1 file changed, 4 insertions(+), 7 deletions(-)
>> 
>> diff --git a/hw/i386/xen/xen_platform.c b/hw/i386/xen/xen_platform.c
>> index a6f0fb478a..15d5ae7c69 100644
>> --- a/hw/i386/xen/xen_platform.c
>> +++ b/hw/i386/xen/xen_platform.c
>> @@ -283,7 +283,10 @@ static void platform_fixed_ioport_writeb(void *opaque, 
>> uint32_t addr, uint32_t v
>>       case 0: /* Platform flags */ {
>>           hvmmem_type_t mem_type = (val & PFFLAG_ROM_LOCK) ?
>>               HVMMEM_ram_ro : HVMMEM_ram_rw;
>> -        if (xen_set_mem_type(xen_domid, mem_type, 0xc0, 0x40)) {
>> +        if (xen_mode == XEN_EMULATE) {
>> +            /* XXX */
>
>???

Needs to mess with the q35/i440gx pam_update() I think.