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165 lines
7.0 KiB
165 lines
7.0 KiB
1 month ago
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From fd6de3c5e97bdf13a39342fc71815a20c66867ae Mon Sep 17 00:00:00 2001
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From: Bernhard Beschow <shentey@gmail.com>
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Date: Wed, 8 May 2024 19:55:07 +0200
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Subject: [PATCH 043/100] hw/i386/pc_sysfw: Alias rather than copy isa-bios
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region
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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RH-MergeRequest: 245: SEV-SNP support
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RH-Jira: RHEL-39544
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Bandan Das <bdas@redhat.com>
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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RH-Commit: [43/91] f64dab2a091838a10a9b94e3d09ea11432b0809f (bonzini/rhel-qemu-kvm)
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In the -bios case the "isa-bios" memory region is an alias to the BIOS mapped
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to the top of the 4G memory boundary. Do the same in the -pflash case, but only
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for new machine versions for migration compatibility. This establishes common
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behavior and makes pflash commands work in the "isa-bios" region which some
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real-world legacy bioses rely on.
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Note that in the sev_enabled() case, the "isa-bios" memory region in the -pflash
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case will now also point to encrypted memory, just like it already does in the
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-bios case.
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When running `info mtree` before and after this commit with
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`qemu-system-x86_64 -S -drive \
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if=pflash,format=raw,readonly=on,file=/usr/share/qemu/bios-256k.bin` and running
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`diff -u before.mtree after.mtree` results in the following changes in the
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memory tree:
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| --- before.mtree
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| +++ after.mtree
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| @@ -71,7 +71,7 @@
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| 0000000000000000-ffffffffffffffff (prio -1, i/o): pci
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| 00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
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| 00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
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| - 00000000000e0000-00000000000fffff (prio 1, rom): isa-bios
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| + 00000000000e0000-00000000000fffff (prio 1, romd): alias isa-bios @system.flash0 0000000000020000-000000000003ffff
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| 00000000000a0000-00000000000bffff (prio 1, i/o): alias smram-region @pci 00000000000a0000-00000000000bffff
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| 00000000000c0000-00000000000c3fff (prio 1, i/o): alias pam-pci @pci 00000000000c0000-00000000000c3fff
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| 00000000000c4000-00000000000c7fff (prio 1, i/o): alias pam-pci @pci 00000000000c4000-00000000000c7fff
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| @@ -108,7 +108,7 @@
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| 0000000000000000-ffffffffffffffff (prio -1, i/o): pci
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| 00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
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| 00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
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| - 00000000000e0000-00000000000fffff (prio 1, rom): isa-bios
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| + 00000000000e0000-00000000000fffff (prio 1, romd): alias isa-bios @system.flash0 0000000000020000-000000000003ffff
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| 00000000000a0000-00000000000bffff (prio 1, i/o): alias smram-region @pci 00000000000a0000-00000000000bffff
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| 00000000000c0000-00000000000c3fff (prio 1, i/o): alias pam-pci @pci 00000000000c0000-00000000000c3fff
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| 00000000000c4000-00000000000c7fff (prio 1, i/o): alias pam-pci @pci 00000000000c4000-00000000000c7fff
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| @@ -131,11 +131,14 @@
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| memory-region: pc.ram
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| 0000000000000000-0000000007ffffff (prio 0, ram): pc.ram
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| +memory-region: system.flash0
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| + 00000000fffc0000-00000000ffffffff (prio 0, romd): system.flash0
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| +
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| memory-region: pci
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| 0000000000000000-ffffffffffffffff (prio -1, i/o): pci
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| 00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
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| 00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
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| - 00000000000e0000-00000000000fffff (prio 1, rom): isa-bios
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| + 00000000000e0000-00000000000fffff (prio 1, romd): alias isa-bios @system.flash0 0000000000020000-000000000003ffff
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| memory-region: smram
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| 00000000000a0000-00000000000bffff (prio 0, ram): alias smram-low @pc.ram 00000000000a0000-00000000000bffff
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Note that in both cases the "system" memory region contains the entry
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00000000fffc0000-00000000ffffffff (prio 0, romd): system.flash0
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but the "system.flash0" memory region only appears standalone when "isa-bios" is
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an alias.
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Signed-off-by: Bernhard Beschow <shentey@gmail.com>
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Message-ID: <20240508175507.22270-7-shentey@gmail.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit a44ea3fa7f2aa1d809fdca1b84a52695b53d8ad0)
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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---
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hw/i386/pc.c | 1 +
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hw/i386/pc_piix.c | 1 +
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hw/i386/pc_q35.c | 1 +
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hw/i386/pc_sysfw.c | 8 +++++++-
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include/hw/i386/pc.h | 1 +
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5 files changed, 11 insertions(+), 1 deletion(-)
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diff --git a/hw/i386/pc.c b/hw/i386/pc.c
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index 1a34bc4522..660a59c63b 100644
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--- a/hw/i386/pc.c
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+++ b/hw/i386/pc.c
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@@ -1967,6 +1967,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
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pcmc->has_reserved_memory = true;
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pcmc->enforce_aligned_dimm = true;
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pcmc->enforce_amd_1tb_hole = true;
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+ pcmc->isa_bios_alias = true;
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/* BIOS ACPI tables: 128K. Other BIOS datastructures: less than 4K reported
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* to be used at the moment, 32K should be enough for a while. */
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pcmc->acpi_data_size = 0x20000 + 0x8000;
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diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
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index bef3e8b73e..dbb7f2ed17 100644
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--- a/hw/i386/pc_piix.c
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+++ b/hw/i386/pc_piix.c
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@@ -975,6 +975,7 @@ static void pc_machine_rhel7_options(MachineClass *m)
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m->alias = "pc";
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m->is_default = 1;
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m->smp_props.prefer_sockets = true;
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+ pcmc->isa_bios_alias = false;
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}
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static void pc_init_rhel760(MachineState *machine)
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diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
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index dedc86eec9..f9900ad798 100644
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--- a/hw/i386/pc_q35.c
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+++ b/hw/i386/pc_q35.c
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@@ -735,6 +735,7 @@ static void pc_q35_machine_rhel940_options(MachineClass *m)
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m->desc = "RHEL-9.4.0 PC (Q35 + ICH9, 2009)";
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pcmc->smbios_stream_product = "RHEL";
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pcmc->smbios_stream_version = "9.4.0";
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+ pcmc->isa_bios_alias = false;
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compat_props_add(m->compat_props, pc_rhel_9_5_compat,
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pc_rhel_9_5_compat_len);
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diff --git a/hw/i386/pc_sysfw.c b/hw/i386/pc_sysfw.c
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index 82d37cb376..ac88ad4eb9 100644
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--- a/hw/i386/pc_sysfw.c
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+++ b/hw/i386/pc_sysfw.c
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@@ -135,6 +135,7 @@ static void pc_system_flash_map(PCMachineState *pcms,
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MemoryRegion *rom_memory)
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{
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X86MachineState *x86ms = X86_MACHINE(pcms);
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+ PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
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hwaddr total_size = 0;
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int i;
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BlockBackend *blk;
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@@ -184,7 +185,12 @@ static void pc_system_flash_map(PCMachineState *pcms,
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if (i == 0) {
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flash_mem = pflash_cfi01_get_memory(system_flash);
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- pc_isa_bios_init(&x86ms->isa_bios, rom_memory, flash_mem);
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+ if (pcmc->isa_bios_alias) {
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+ x86_isa_bios_init(&x86ms->isa_bios, rom_memory, flash_mem,
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+ true);
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+ } else {
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+ pc_isa_bios_init(&x86ms->isa_bios, rom_memory, flash_mem);
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+ }
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/* Encrypt the pflash boot ROM */
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if (sev_enabled()) {
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diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
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index 467e7fb52f..3f53ec73ac 100644
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--- a/include/hw/i386/pc.h
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+++ b/include/hw/i386/pc.h
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@@ -122,6 +122,7 @@ struct PCMachineClass {
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bool enforce_aligned_dimm;
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bool broken_reserved_end;
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bool enforce_amd_1tb_hole;
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+ bool isa_bios_alias;
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/* generate legacy CPU hotplug AML */
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bool legacy_cpu_hotplug;
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--
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2.39.3
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