powernv: boot OpenBSD on POWER9
The POWER9 Processor User's Manual, section 4.9.4, specifies that POWER9 ignores PTCR[PATS] and only supports a 64 KiB partition table. Use an effective PATS value of 4 on POWER9; other processors keep the existing ISA v3.0 interpretation. The PSI model now exposes POWER9 IRQ level and pending status registers, and keeps both updated while delivering through the existing XIVE LSI source. This lets guests that select the POWER9 PSI LSI IRQ method continue to receive LPC interrupts. The blast radius is probably minimal: the PTCR change is limited to POWER9, while the PSI change only touches POWER9 PSI state and reuses the existing delivery path. Acked-by: Chinmay Rath <rathc@linux.ibm.com> Signed-off-by: Kirill A. Korinsky <kirill@korins.ky> Reviewed-by: Aditya Gupta <adityag@linux.ibm.com> Link: https://lore.kernel.org/qemu-devel/20260719145559.94342-1-kirill@korins.ky Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Kirill A. Korinsky committed
Jul 19, 2026 at 16:55 UTC
504810bbdfd9c65a808b4684b2b0f6871f2d8c1c
4 files changed
+79
-7
hw/ppc/pnv_psi.c
+8
-3
@@ -688,6 +688,8 @@ static uint64_t pnv_psi_p9_mmio_read(void *opaque, hwaddr addr, unsigned size)
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case PSIHB9_ESB_CI_BASE:
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case PSIHB9_ESB_NOTIF_ADDR:
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case PSIHB9_IVT_OFFSET:
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+ case PSIHB9_IRQ_LEVEL:
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+ case PSIHB9_IRQ_STAT:
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val = psi->regs[reg];
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break;
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default:
@@ -818,17 +820,20 @@ static void pnv_psi_power9_set_irq(void *opaque, int irq, int state)
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{
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PnvPsi *psi = opaque;
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uint64_t irq_method = psi->regs[PSIHB_REG(PSIHB9_INTERRUPT_CONTROL)];
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+ uint64_t irq_bit = PPC_BIT(irq);
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if (irq_method & PSIHB9_IRQ_METHOD) {
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qemu_log_mask(LOG_GUEST_ERROR, "PSI: LSI IRQ method no supported\n");
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return;
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}
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- /* Update LSI levels */
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+ /* Update LSI levels and pending status */
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if (state) {
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- psi->regs[PSIHB_REG(PSIHB9_IRQ_LEVEL)] |= PPC_BIT(irq);
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+ psi->regs[PSIHB_REG(PSIHB9_IRQ_LEVEL)] |= irq_bit;
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+ psi->regs[PSIHB_REG(PSIHB9_IRQ_STAT)] |= irq_bit;
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} else {
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- psi->regs[PSIHB_REG(PSIHB9_IRQ_LEVEL)] &= ~PPC_BIT(irq);
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+ psi->regs[PSIHB_REG(PSIHB9_IRQ_LEVEL)] &= ~irq_bit;
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+ psi->regs[PSIHB_REG(PSIHB9_IRQ_STAT)] &= ~irq_bit;
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}
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qemu_set_irq(psi->qirqs[irq], state);
target/ppc/mmu-book3s-v3.c
+17
-4
@@ -23,24 +23,37 @@
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#include "mmu-hash64.h"
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#include "mmu-book3s-v3.h"
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+#define PPC64_V3_PATE_SIZE 16 /* two 64-bit words */
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+
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bool ppc64_v3_get_pate(PowerPCCPU *cpu, target_ulong lpid, ppc_v3_pate_t *entry)
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{
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uint64_t patb = cpu->env.spr[SPR_PTCR] & PTCR_PATB;
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uint64_t pats = cpu->env.spr[SPR_PTCR] & PTCR_PATS;
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+ uint64_t table_size;
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+ uint64_t entries;
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+
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+ /*
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+ * The POWER9 Processor User's Manual, section 4.9.4, specifies that
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+ * POWER9 ignores PTCR[PATS] and only supports a 64 KiB partition table.
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+ */
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+ if (cpu->env.excp_model == POWERPC_EXCP_POWER9) {
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+ pats = 4;
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+ }
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+ table_size = 1ULL << (pats + 12);
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/* Check if partition table is properly aligned */
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- if (patb & MAKE_64BIT_MASK(0, pats + 12)) {
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+ if (patb & (table_size - 1)) {
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return false;
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}
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/* Calculate number of entries */
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- pats = 1ull << (pats + 12 - 4);
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- if (pats <= lpid) {
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+ entries = table_size / PPC64_V3_PATE_SIZE;
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+ if (entries <= lpid) {
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return false;
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}
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/* Grab entry */
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- patb += 16 * lpid;
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+ patb += PPC64_V3_PATE_SIZE * lpid;
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entry->dw0 = ldq_phys(CPU(cpu)->as, patb);
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entry->dw1 = ldq_phys(CPU(cpu)->as, patb + 8);
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return true;
tests/functional/ppc64/meson.build
+2
@@ -4,6 +4,7 @@ test_ppc64_timeouts = {
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'fadump' : 480,
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'hv' : 1000,
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'mac99' : 120,
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+ 'openbsd' : 240,
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'powernv' : 480,
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'pseries' : 480,
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'replay' : 210,
@@ -20,6 +21,7 @@ tests_ppc64_system_thorough = [
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'fadump',
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'hv',
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'mac99',
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+ 'openbsd',
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'powernv',
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'pseries',
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'replay',
tests/functional/ppc64/test_openbsd.py
new
+52
@@ -0,0 +1,52 @@
1
+#!/usr/bin/env python3
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+#
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+# Test that OpenBSD boots on a ppc powernv machine and reaches the installer.
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+#
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+# SPDX-License-Identifier: GPL-2.0-or-later
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+
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+from qemu_test import QemuSystemTest, Asset
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+from qemu_test import wait_for_console_pattern
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+
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+
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+class OpenBSDPowerNV(QemuSystemTest):
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+
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+ ASSET_MINIROOT = Asset(
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+ 'https://kirill.korins.ky/pub/qemu-powerpc64-openbsd/miniroot79.img',
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+ '7829e42b75d81cafd732038b9d63228b79c1f5828d8375872a4bb655e1d6b13c')
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+
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+ ASSET_BOOTKERNEL = Asset(
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+ 'https://kirill.korins.ky/pub/qemu-powerpc64-openbsd/pnor.BOOTKERNEL',
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+ '397ce43ce61910e1a2c4f13d301f957e61513a9ec5371bc3e87d3095411fae7b')
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+
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+ def test_powernv9_openbsd_installer(self):
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+ self.set_machine('powernv9')
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+ self.require_accelerator('tcg')
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+
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+ miniroot_path = self.ASSET_MINIROOT.fetch()
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+ bootkernel_path = self.ASSET_BOOTKERNEL.fetch()
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+
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+ self.vm.set_console()
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+ self.vm.add_args('-cpu', 'power9',
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+ '-accel', 'tcg,thread=single',
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+ '-smp', '1,cores=1,threads=1',
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+ '-m', '2g',
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+ '-kernel', bootkernel_path,
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+ '-device',
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+ 'ich9-ahci,id=sata0,bus=pcie.0,addr=0x0',
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+ '-drive',
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+ f'file={miniroot_path},format=raw,if=none,'
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+ 'id=bootdisk,snapshot=on',
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+ '-device',
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+ 'ide-hd,bus=sata0.0,unit=0,drive=bootdisk,'
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+ 'bootindex=1')
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+ self.vm.launch()
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+
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+ wait_for_console_pattern(self, 'OpenBSD 7.9 (RAMDISK)', 'panic:')
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+ wait_for_console_pattern(
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+ self,
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+ '(I)nstall, (U)pgrade, (A)utoinstall or (S)hell?',
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+ 'panic:')
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+
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+
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+if __name__ == '__main__':
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+ QemuSystemTest.main()