motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-03 07:43:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

target/ppc: Fix host PVR matching for KVM

Browse source 
ppc_cpu_compare_class_pvr_mask() should match the best CPU class in the
family, because it is used by the KVM subsystem to find the host CPU
class. Since commit 03ae4133ab ("target-ppc: Add pvr_match()
callback"), it matches any class in the family (the first one in the
comparison list).

Since commit f30c843ced ("ppc/pnv: Introduce PowerNV machines with
fixed CPU models"), pnv has relied on pnv_match having these new
semantics to check machine compatibility with a CPU family.

Resolve this by adding a parameter to the pvr_match function to select
the best or any match, and restore the old behaviour for the KVM case.

Prior to this fix, e.g., a POWER9 DD2.3 KVM host matches to the
power9_v1.0 class (because that happens to be the first POWER9 family
CPU compared). After the patch, it matches the power9_v2.0 class.

This approach requires pnv_match contain knowledge of the CPU classes
implemented in the same family, which feels ugly. But pushing the 'best'
match down to the class would still require they know about one another
which is not obviously much better. For now this gets things working.

Fixes: 03ae4133ab ("target-ppc: Add pvr_match() callback")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20220731013358.170187-1-npiggin@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Nicholas Piggin 2022-07-31 11:33:58 +10:00 • committed by Daniel Henrique Barboza
parent c49b67f72b
commit 21d3a78ed9
4 changed files with 77 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

91
target/ppc/cpu_init.c
View file

@ -5912,15 +5912,25 @@ static void init_proc_POWER7(CPUPPCState *env)
ppcPOWER7_irq_init(env_archcpu(env));
}
static bool ppc_pvr_match_power7(PowerPCCPUClass *pcc, uint32_t pvr)
static bool ppc_pvr_match_power7(PowerPCCPUClass *pcc, uint32_t pvr, bool best)
{
if ((pvr & CPU_POWERPC_POWER_SERVER_MASK) == CPU_POWERPC_POWER7P_BASE) {
return true;
uint32_t base = pvr & CPU_POWERPC_POWER_SERVER_MASK;
uint32_t pcc_base = pcc->pvr & CPU_POWERPC_POWER_SERVER_MASK;
if (!best) {
if (base == CPU_POWERPC_POWER7_BASE) {
return true;
}
if (base == CPU_POWERPC_POWER7P_BASE) {
return true;
}
}
if ((pvr & CPU_POWERPC_POWER_SERVER_MASK) == CPU_POWERPC_POWER7_BASE) {
return true;
if (base != pcc_base) {
return false;
}
return false;
return true;
}
static bool cpu_has_work_POWER7(CPUState *cs)
@ -6073,18 +6083,27 @@ static void init_proc_POWER8(CPUPPCState *env)
ppcPOWER7_irq_init(env_archcpu(env));
}
static bool ppc_pvr_match_power8(PowerPCCPUClass *pcc, uint32_t pvr)
static bool ppc_pvr_match_power8(PowerPCCPUClass *pcc, uint32_t pvr, bool best)
{
if ((pvr & CPU_POWERPC_POWER_SERVER_MASK) == CPU_POWERPC_POWER8NVL_BASE) {
return true;
uint32_t base = pvr & CPU_POWERPC_POWER_SERVER_MASK;
uint32_t pcc_base = pcc->pvr & CPU_POWERPC_POWER_SERVER_MASK;
if (!best) {
if (base == CPU_POWERPC_POWER8_BASE) {
return true;
}
if (base == CPU_POWERPC_POWER8E_BASE) {
return true;
}
if (base == CPU_POWERPC_POWER8NVL_BASE) {
return true;
}
}
if ((pvr & CPU_POWERPC_POWER_SERVER_MASK) == CPU_POWERPC_POWER8E_BASE) {
return true;
if (base != pcc_base) {
return false;
}
if ((pvr & CPU_POWERPC_POWER_SERVER_MASK) == CPU_POWERPC_POWER8_BASE) {
return true;
}
return false;
return true;
}
static bool cpu_has_work_POWER8(CPUState *cs)
@ -6282,11 +6301,26 @@ static void init_proc_POWER9(CPUPPCState *env)
ppcPOWER9_irq_init(env_archcpu(env));
}
static bool ppc_pvr_match_power9(PowerPCCPUClass *pcc, uint32_t pvr)
static bool ppc_pvr_match_power9(PowerPCCPUClass *pcc, uint32_t pvr, bool best)
{
if ((pvr & CPU_POWERPC_POWER_SERVER_MASK) == CPU_POWERPC_POWER9_BASE) {
uint32_t base = pvr & CPU_POWERPC_POWER_SERVER_MASK;
uint32_t pcc_base = pcc->pvr & CPU_POWERPC_POWER_SERVER_MASK;
if (!best) {
if (base == CPU_POWERPC_POWER9_BASE) {
return true;
}
}
if (base != pcc_base) {
return false;
}
if ((pvr & 0x0f00) == (pcc->pvr & 0x0f00)) {
/* Major DD version matches to power9_v1.0 and power9_v2.0 */
return true;
}
return false;
}
@ -6499,11 +6533,26 @@ static void init_proc_POWER10(CPUPPCState *env)
ppcPOWER9_irq_init(env_archcpu(env));
}
static bool ppc_pvr_match_power10(PowerPCCPUClass *pcc, uint32_t pvr)
static bool ppc_pvr_match_power10(PowerPCCPUClass *pcc, uint32_t pvr, bool best)
{
if ((pvr & CPU_POWERPC_POWER_SERVER_MASK) == CPU_POWERPC_POWER10_BASE) {
uint32_t base = pvr & CPU_POWERPC_POWER_SERVER_MASK;
uint32_t pcc_base = pcc->pvr & CPU_POWERPC_POWER_SERVER_MASK;
if (!best) {
if (base == CPU_POWERPC_POWER10_BASE) {
return true;
}
}
if (base != pcc_base) {
return false;
}
if ((pvr & 0x0f00) == (pcc->pvr & 0x0f00)) {
/* Major DD version matches to power10_v1.0 and power10_v2.0 */
return true;
}
return false;
}
@ -6910,7 +6959,7 @@ static gint ppc_cpu_compare_class_pvr_mask(gconstpointer a, gconstpointer b)
return -1;
}
if (pcc->pvr_match(pcc, pvr)) {
if (pcc->pvr_match(pcc, pvr, true)) {
return 0;
}
@ -7308,7 +7357,7 @@ static void ppc_cpu_instance_finalize(Object *obj)
ppc_hash64_finalize(cpu);
}
static bool ppc_pvr_match_default(PowerPCCPUClass *pcc, uint32_t pvr)
static bool ppc_pvr_match_default(PowerPCCPUClass *pcc, uint32_t pvr, bool best)
{
return pcc->pvr == pvr;
}