xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/mm: Write to PTCR only if ultravisor disabled

Browse Source 
In ultravisor enabled systems, PTCR becomes ultravisor privileged only
for writing and an attempt to write to it will cause a Hypervisor
Emulation Assitance interrupt.

This patch uses the set_ptcr_when_no_uv() function to restrict PTCR
writing to only when ultravisor is disabled.

Signed-off-by: Claudio Carvalho <cclaudio@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190822034838.27876-6-cclaudio@linux.ibm.com
This commit is contained in:
Claudio Carvalho
2019-08-22 00:48:36 -03:00
committed by Michael Ellerman
parent 139a1d2842
commit 5223134029
4 changed files with 21 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
arch/powerpc/include/asm/ultravisor.h
View File

@@ -10,10 +10,22 @@
#include <asm/asm-prototypes.h>
#include <asm/ultravisor-api.h>
#include <asm/firmware.h>
int early_init_dt_scan_ultravisor(unsigned long node, const char *uname,
int depth, void *data);
/*
* In ultravisor enabled systems, PTCR becomes ultravisor privileged only for
* writing and an attempt to write to it will cause a Hypervisor Emulation
* Assistance interrupt.
*/
static inline void set_ptcr_when_no_uv(u64 val)
{
if (!firmware_has_feature(FW_FEATURE_ULTRAVISOR))
mtspr(SPRN_PTCR, val);
}
static inline int uv_register_pate(u64 lpid, u64 dw0, u64 dw1)
{
return ucall_norets(UV_WRITE_PATE, lpid, dw0, dw1);