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spapr: Generate random HASHPKEYR for spapr machines

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The hypervisor is expected to create a value for the HASHPKEY SPR for
each partition. Currently it uses zero for all partitions, use a
random number instead, which in theory might make kernel ROP protection
more secure.

Signed-of-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20241219034035.1826173-4-npiggin@gmail.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Nicholas Piggin 2024-12-19 13:40:33 +10:00
parent b4aa82dc3a
commit d91b101da1
3 changed files with 6 additions and 0 deletions
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3
hw/ppc/spapr.c
View file

@ -2917,6 +2917,9 @@ static void spapr_machine_init(MachineState *machine)
spapr_ovec_set(spapr->ov5, OV5_XIVE_EXPLOIT);
}
qemu_guest_getrandom_nofail(&spapr->hashpkey_val,
sizeof(spapr->hashpkey_val));
/* init CPUs */
spapr_init_cpus(spapr);

2
hw/ppc/spapr_cpu_core.c
View file

@ -273,6 +273,8 @@ static bool spapr_realize_vcpu(PowerPCCPU *cpu, SpaprMachineState *spapr,
env->spr_cb[SPR_PIR].default_value = cs->cpu_index;
env->spr_cb[SPR_TIR].default_value = thread_index;
env->spr_cb[SPR_HASHPKEYR].default_value = spapr->hashpkey_val;
cpu_ppc_set_1lpar(cpu);
/* Set time-base frequency to 512 MHz. vhyp must be set first. */

1
include/hw/ppc/spapr.h
View file

@ -203,6 +203,7 @@ struct SpaprMachineState {
uint32_t fdt_initial_size;
void *fdt_blob;
uint8_t fdt_rng_seed[32];
uint64_t hashpkey_val;
long kernel_size;
bool kernel_le;
uint64_t kernel_addr;