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[Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interf
From: |
Igor Mammedov |
Subject: |
[Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS |
Date: |
Tue, 12 Nov 2013 14:58:27 +0100 |
'etc/reserved-memory-end' will allow QEMU to tell BIOS where PCI
BARs mapping could safely start in high memory.
Allowing BIOS to start mapping 64-bit PCI BARs at address where it
wouldn't conflict with other mappings QEMU might place before it.
That permits QEMU to reserve extra address space before
64-bit PCI hole for memory hotplug.
Signed-off-by: Igor Mammedov <address@hidden>
---
hw/i386/pc.c | 14 +++++++++++++-
hw/pci-host/piix.c | 3 ++-
hw/pci-host/q35.c | 3 ++-
include/hw/i386/pc.h | 3 ++-
4 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 6c82ada..b504047 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1095,11 +1095,23 @@ PcGuestInfo *pc_guest_info_init(ram_addr_t
below_4g_mem_size,
/* setup pci memory address space mapping into system address space */
void pc_pci_as_mapping_init(Object *owner, MemoryRegion *system_memory,
- MemoryRegion *pci_address_space)
+ MemoryRegion *pci_address_space,
+ uint64_t reserved_memory_end)
{
+ uint64_t *val;
+ FWCfgState *fw_cfg = fw_cfg_find();
+
/* Set to lower priority than RAM */
memory_region_add_subregion_overlap(system_memory, 0x0,
pci_address_space, -1);
+ g_assert(fw_cfg);
+ /*
+ * Align address at 1G, this makes sure it can be exactly covered
+ * with a PAT entry even when using huge pages.
+ */
+ val = g_malloc(sizeof(*val));
+ *val = cpu_to_le64(ROUND_UP(reserved_memory_end, 0x1ULL << 30));
+ fw_cfg_add_file(fw_cfg, "etc/reserved-memory-end", val, sizeof(*val));
}
void pc_acpi_init(const char *default_dsdt)
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index 5d4e290..16205e7 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -351,7 +351,8 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
/* setup pci memory mapping */
pc_pci_as_mapping_init(OBJECT(f), f->system_memory,
- f->pci_address_space);
+ f->pci_address_space,
+ 0x100000000ULL + above_4g_mem_size);
memory_region_init_alias(&f->smram_region, OBJECT(d), "smram-region",
f->pci_address_space, 0xa0000, 0x20000);
diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
index d1792de..1293353 100644
--- a/hw/pci-host/q35.c
+++ b/hw/pci-host/q35.c
@@ -353,7 +353,8 @@ static int mch_init(PCIDevice *d)
/* setup pci memory mapping */
pc_pci_as_mapping_init(OBJECT(mch), mch->system_memory,
- mch->pci_address_space);
+ mch->pci_address_space,
+ 0x100000000ULL + mch->above_4g_mem_size);
/* smram */
cpu_smm_register(&mch_set_smm, mch);
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 8b3be3c..2663046 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -130,7 +130,8 @@ PcGuestInfo *pc_guest_info_init(ram_addr_t
below_4g_mem_size,
void pc_pci_as_mapping_init(Object *owner, MemoryRegion *system_memory,
- MemoryRegion *pci_address_space);
+ MemoryRegion *pci_address_space,
+ uint64_t reserved_memory_end);
FWCfgState *pc_memory_init(MemoryRegion *system_memory,
const char *kernel_filename,
--
1.8.3.1
- [Qemu-devel] [PATCH for-1.8 0/2 v3] pc: inform SeaBIOS where 64-bit PCI hole begins, Igor Mammedov, 2013/11/12
- [Qemu-devel] [PATCH 1/2] pc: map PCI address space as catchall region for not mapped addresses, Igor Mammedov, 2013/11/12
- [Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS,
Igor Mammedov <=
- Re: [Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS, Paolo Bonzini, 2013/11/12
- Re: [Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS, Igor Mammedov, 2013/11/12
- Re: [Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS, Michael S. Tsirkin, 2013/11/12
- Re: [Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS, Paolo Bonzini, 2013/11/12
- Re: [Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS, Igor Mammedov, 2013/11/13
- Re: [Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS, Michael S. Tsirkin, 2013/11/14
- Re: [Qemu-devel] [PATCH 2/2] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS, Igor Mammedov, 2013/11/14
- [Qemu-devel] [PATCH 2/2 v4] pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS, Igor Mammedov, 2013/11/14