On 13.05.2024 17:27, Roger Pau Monné wrote: > On Mon, May 13, 2024 at 11:10:59AM +0000, Elias El Yandouzi wrote: >> @@ -317,6 +317,14 @@ extern unsigned long xen_phys_start; >> #define ARG_XLAT_START(v) \ >> (ARG_XLAT_VIRT_START + ((v)->vcpu_id << ARG_XLAT_VA_SHIFT)) >> >> +/* pv_root_pt mapping area. The fourth per-domain-mapping sub-area */ >> +#define PV_ROOT_PT_MAPPING_VIRT_START PERDOMAIN_VIRT_SLOT(3) >> +#define PV_ROOT_PT_MAPPING_ENTRIES MAX_VIRT_CPUS >> + >> +/* The address of a particular VCPU's PV_ROOT_PT */ >> +#define PV_ROOT_PT_MAPPING_VCPU_VIRT_START(v) \ >> + (PV_ROOT_PT_MAPPING_VIRT_START + ((v)->vcpu_id * PAGE_SIZE)) > > I know we are not there yet, but I wonder if we need to start having > some non-shared per-cpu mapping area in the page-tables. Right now > this is shared between all the vCPUs, as it's per-domain space > (instead of per-vCPU).
In turn requiring per-vCPU page tables, posing a problem when a guest uses the same page tables for multiple vCPU-s. Jan
