[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-stable] [PATCH 36/54] spapr: don't initialize PATB entry if max-cp
From: |
Michael Roth |
Subject: |
[Qemu-stable] [PATCH 36/54] spapr: don't initialize PATB entry if max-cpu-compat < power9 |
Date: |
Tue, 6 Feb 2018 13:14:57 -0600 |
From: Laurent Vivier <address@hidden>
if KVM is enabled and KVM capabilities MMU radix is available,
the partition table entry (patb_entry) for the radix mode is
initialized by default in ppc_spapr_reset().
It's a problem if we want to migrate the guest to a POWER8 host
while the kernel is not started to set the value to the one
expected for a POWER8 CPU.
The "-machine max-cpu-compat=power8" should allow to migrate
a POWER9 KVM host to a POWER8 KVM host, but because patb_entry
is set, the destination QEMU tries to enable radix mode on the
POWER8 host. This fails and cancels the migration:
Process table config unsupported by the host
error while loading state for instance 0x0 of device 'spapr'
load of migration failed: Invalid argument
This patch doesn't set the PATB entry if the user provides
a CPU compatibility mode that doesn't support radix mode.
Signed-off-by: Laurent Vivier <address@hidden>
Signed-off-by: David Gibson <address@hidden>
(cherry picked from commit 1481fe5fcfeb7fcf3c1ebb9d8c0432e3e0188ccf)
Signed-off-by: Michael Roth <address@hidden>
---
hw/ppc/spapr.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 1ac7eb0f8c..66d0ed5256 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1440,7 +1440,10 @@ static void ppc_spapr_reset(void)
/* Check for unknown sysbus devices */
foreach_dynamic_sysbus_device(find_unknown_sysbus_device, NULL);
- if (kvm_enabled() && kvmppc_has_cap_mmu_radix()) {
+ first_ppc_cpu = POWERPC_CPU(first_cpu);
+ if (kvm_enabled() && kvmppc_has_cap_mmu_radix() &&
+ ppc_check_compat(first_ppc_cpu, CPU_POWERPC_LOGICAL_3_00, 0,
+ spapr->max_compat_pvr)) {
/* If using KVM with radix mode available, VCPUs can be started
* without a HPT because KVM will start them in radix mode.
* Set the GR bit in PATB so that we know there is no HPT. */
@@ -1499,7 +1502,6 @@ static void ppc_spapr_reset(void)
g_free(fdt);
/* Set up the entry state */
- first_ppc_cpu = POWERPC_CPU(first_cpu);
first_ppc_cpu->env.gpr[3] = fdt_addr;
first_ppc_cpu->env.gpr[5] = 0;
first_cpu->halted = 0;
--
2.11.0
- [Qemu-stable] [PATCH 44/54] hw/ppc/spapr_caps: Rework spapr_caps to use uint8 internal representation, (continued)
- [Qemu-stable] [PATCH 44/54] hw/ppc/spapr_caps: Rework spapr_caps to use uint8 internal representation, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 45/54] ppc: Change Power9 compat table to support at most 8 threads/core, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 43/54] spapr: Handle Decimal Floating Point (DFP) as an optional capability, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 49/54] target/ppc/kvm: Add cap_ppc_safe_[cache/bounds_check/indirect_branch], Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 47/54] target/ppc: introduce the PPC_BIT() macro, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 48/54] target/ppc/spapr_caps: Add macro to generate spapr_caps migration vmstate, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 46/54] spapr: fix device tree properties when using compatibility mode, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 04/54] qemu-options: Remove stray colons from output of --help, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 54/54] target/ppc/spapr: Add H-Call H_GET_CPU_CHARACTERISTICS, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 53/54] target/ppc/spapr_caps: Add new tristate cap safe_indirect_branch, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 36/54] spapr: don't initialize PATB entry if max-cpu-compat < power9,
Michael Roth <=
- [Qemu-stable] [PATCH 52/54] target/ppc/spapr_caps: Add new tristate cap safe_bounds_check, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 39/54] spapr: Treat Hardware Transactional Memory (HTM) as an optional capability, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 38/54] spapr: Capabilities infrastructure, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 40/54] spapr: Validate capabilities on migration, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 50/54] target/ppc/spapr_caps: Add support for tristate spapr_capabilities, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 51/54] target/ppc/spapr_caps: Add new tristate cap safe_cache, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 07/54] block: Make bdrv_drain_invoke() recursive, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 08/54] block: Call .drain_begin only once in bdrv_drain_all_begin(), Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 05/54] qemu-pr-helper: miscellaneous fixes, Michael Roth, 2018/02/06
- [Qemu-stable] [PATCH 06/54] block/nbd: fix segmentation fault when .desc is not null-terminated, Michael Roth, 2018/02/06