Subject: [kvm-unit-tests PATCH v9 11/31] powerpc/sprs: Test hypervisor registers on powernv machine

From: Nicholas Piggin <[email-masked]>
Date: Sat, 4 May 2024 22:28:17 +1000

This enables HV privilege registers to be tested with the powernv
machine.

Acked-by: Thomas Huth <[email-masked]>
Signed-off-by: Nicholas Piggin <[email-masked]>
---
 powerpc/sprs.c | 33 +++++++++++++++++++++++++--------
 1 file changed, 25 insertions(+), 8 deletions(-)

diff --git a/powerpc/sprs.c b/powerpc/sprs.c
index c25dac1f6..de9e87a21 100644
--- a/powerpc/sprs.c
+++ b/powerpc/sprs.c
@@ -199,16 +199,16 @@ static const struct spr sprs_power_common[1024] = {
 [190] = { "HFSCR",	64,	HV_RW, },
 [256] = { "VRSAVE",	32,	RW, },
 [259] = { "SPRG3",	64,	RO, },
-[284] = { "TBL",	32,	HV_WO, },
-[285] = { "TBU",	32,	HV_WO, },
-[286] = { "TBU40",	64,	HV_WO, },
+[284] = { "TBL",	32,	HV_WO, }, /* Things can go a bit wonky with */
+[285] = { "TBU",	32,	HV_WO, }, /* Timebase changing. Should save */
+[286] = { "TBU40",	64,	HV_WO, }, /* and restore it. */
 [304] = { "HSPRG0",	64,	HV_RW, },
 [305] = { "HSPRG1",	64,	HV_RW, },
 [306] = { "HDSISR",	32,	HV_RW,		SPR_INT, },
 [307] = { "HDAR",	64,	HV_RW,		SPR_INT, },
 [308] = { "SPURR",	64,	HV_RW | OS_RO,	SPR_ASYNC, },
 [309] = { "PURR",	64,	HV_RW | OS_RO,	SPR_ASYNC, },
-[313] = { "HRMOR",	64,	HV_RW, },
+[313] = { "HRMOR",	64,	HV_RW,		SPR_HARNESS, }, /* Harness can't cope with HRMOR changing */
 [314] = { "HSRR0",	64,	HV_RW,		SPR_INT, },
 [315] = { "HSRR1",	64,	HV_RW,		SPR_INT, },
 [318] = { "LPCR",	64,	HV_RW, },
@@ -306,7 +306,7 @@ static const struct spr sprs_power9_10[1024] = {
 [921] = { "TSCR",	32,	HV_RW, },
 [922] = { "TTR",	64,	HV_RW, },
 [1006]= { "TRACE",	64,	WO, },
-[1008]= { "HID",	64,	HV_RW, },
+[1008]= { "HID",	64,	HV_RW,		SPR_HARNESS, }, /* HILE would be unhelpful to change */
 };
 
 /* This covers POWER8 and POWER9 PMUs */
@@ -350,6 +350,22 @@ static const struct spr sprs_power10_pmu[1024] = {
 
 static struct spr sprs[1024];
 
+static bool spr_read_perms(int spr)
+{
+	if (cpu_has_hv)
+		return !!(sprs[spr].access & SPR_HV_READ);
+	else
+		return !!(sprs[spr].access & SPR_OS_READ);
+}
+
+static bool spr_write_perms(int spr)
+{
+	if (cpu_has_hv)
+		return !!(sprs[spr].access & SPR_HV_WRITE);
+	else
+		return !!(sprs[spr].access & SPR_OS_WRITE);
+}
+
 static void setup_sprs(void)
 {
 	int i;
@@ -461,7 +477,7 @@ static void get_sprs(uint64_t *v)
 	int i;
 
 	for (i = 0; i < 1024; i++) {
-		if (!(sprs[i].access & SPR_OS_READ))
+		if (!spr_read_perms(i))
 			continue;
 		v[i] = __mfspr(i);
 	}
@@ -472,8 +488,9 @@ static void set_sprs(uint64_t val)
 	int i;
 
 	for (i = 0; i < 1024; i++) {
-		if (!(sprs[i].access & SPR_OS_WRITE))
+		if (!spr_write_perms(i))
 			continue;
+
 		if (sprs[i].type & SPR_HARNESS)
 			continue;
 		__mtspr(i, val);
@@ -561,7 +578,7 @@ int main(int argc, char **argv)
 	for (i = 0; i < 1024; i++) {
 		bool pass = true;
 
-		if (!(sprs[i].access & SPR_OS_READ))
+		if (!spr_read_perms(i))
 			continue;
 
 		if (sprs[i].width == 32) {
-- 
2.43.0