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q35: Introduce smm_ranges property for q35-pci-host

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Add a q35 property to check whether or not SMM ranges, e.g. SMRAM, TSEG,
etc... exist for the target platform.  TDX doesn't support SMM and doesn't
play nice with QEMU modifying related guest memory ranges.

Signed-off-by: Isaku Yamahata <isaku.yamahata@linux.intel.com>
Co-developed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Message-ID: <20240320083945.991426-19-michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Isaku Yamahata 2024-03-20 03:39:14 -05:00 committed by Paolo Bonzini
parent 42c11ae241
commit b07bf7b73f
4 changed files with 33 additions and 13 deletions
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2
hw/i386/pc_q35.c
View file

@ -219,6 +219,8 @@ static void pc_q35_init(MachineState *machine)
x86ms->above_4g_mem_size, NULL);
object_property_set_bool(phb, PCI_HOST_BYPASS_IOMMU,
pcms->default_bus_bypass_iommu, NULL);
object_property_set_bool(phb, PCI_HOST_PROP_SMM_RANGES,
x86_machine_is_smm_enabled(x86ms), NULL);
sysbus_realize_and_unref(SYS_BUS_DEVICE(phb), &error_fatal);
/* pci */

42
hw/pci-host/q35.c
View file

@ -179,6 +179,8 @@ static Property q35_host_props[] = {
mch.below_4g_mem_size, 0),
DEFINE_PROP_SIZE(PCI_HOST_ABOVE_4G_MEM_SIZE, Q35PCIHost,
mch.above_4g_mem_size, 0),
DEFINE_PROP_BOOL(PCI_HOST_PROP_SMM_RANGES, Q35PCIHost,
mch.has_smm_ranges, true),
DEFINE_PROP_BOOL("x-pci-hole64-fix", Q35PCIHost, pci_hole64_fix, true),
DEFINE_PROP_END_OF_LIST(),
};
@ -214,6 +216,7 @@ static void q35_host_initfn(Object *obj)
/* mch's object_initialize resets the default value, set it again */
qdev_prop_set_uint64(DEVICE(s), PCI_HOST_PROP_PCI_HOLE64_SIZE,
Q35_PCI_HOST_HOLE64_SIZE_DEFAULT);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "uint32",
q35_host_get_pci_hole_start,
NULL, NULL, NULL);
@ -476,6 +479,10 @@ static void mch_write_config(PCIDevice *d,
mch_update_pciexbar(mch);
}
if (!mch->has_smm_ranges) {
return;
}
if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,
MCH_HOST_BRIDGE_SMRAM_SIZE)) {
mch_update_smram(mch);
@ -494,10 +501,13 @@ static void mch_write_config(PCIDevice *d,
static void mch_update(MCHPCIState *mch)
{
mch_update_pciexbar(mch);
mch_update_pam(mch);
mch_update_smram(mch);
mch_update_ext_tseg_mbytes(mch);
mch_update_smbase_smram(mch);
if (mch->has_smm_ranges) {
mch_update_smram(mch);
mch_update_ext_tseg_mbytes(mch);
mch_update_smbase_smram(mch);
}
/*
* pci hole goes from end-of-low-ram to io-apic.
@ -538,19 +548,21 @@ static void mch_reset(DeviceState *qdev)
pci_set_quad(d->config + MCH_HOST_BRIDGE_PCIEXBAR,
MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;
d->config[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_DEFAULT;
d->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK;
d->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK;
if (mch->has_smm_ranges) {
d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;
d->config[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_DEFAULT;
d->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK;
d->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK;
if (mch->ext_tseg_mbytes > 0) {
pci_set_word(d->config + MCH_HOST_BRIDGE_EXT_TSEG_MBYTES,
MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_QUERY);
if (mch->ext_tseg_mbytes > 0) {
pci_set_word(d->config + MCH_HOST_BRIDGE_EXT_TSEG_MBYTES,
MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_QUERY);
}
d->config[MCH_HOST_BRIDGE_F_SMBASE] = 0;
d->wmask[MCH_HOST_BRIDGE_F_SMBASE] = 0xff;
}
d->config[MCH_HOST_BRIDGE_F_SMBASE] = 0;
d->wmask[MCH_HOST_BRIDGE_F_SMBASE] = 0xff;
mch_update(mch);
}
@ -578,6 +590,10 @@ static void mch_realize(PCIDevice *d, Error **errp)
PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE);
}
if (!mch->has_smm_ranges) {
return;
}
/* if *disabled* show SMRAM to all CPUs */
memory_region_init_alias(&mch->smram_region, OBJECT(mch), "smram-region",
mch->pci_address_space, MCH_HOST_BRIDGE_SMRAM_C_BASE,

1
include/hw/i386/pc.h
View file

@ -161,6 +161,7 @@ void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
#define PCI_HOST_PROP_PCI_HOLE64_SIZE "pci-hole64-size"
#define PCI_HOST_BELOW_4G_MEM_SIZE "below-4g-mem-size"
#define PCI_HOST_ABOVE_4G_MEM_SIZE "above-4g-mem-size"
#define PCI_HOST_PROP_SMM_RANGES "smm-ranges"
void pc_pci_as_mapping_init(MemoryRegion *system_memory,

1
include/hw/pci-host/q35.h
View file

@ -50,6 +50,7 @@ struct MCHPCIState {
MemoryRegion tseg_blackhole, tseg_window;
MemoryRegion smbase_blackhole, smbase_window;
bool has_smram_at_smbase;
bool has_smm_ranges;
Range pci_hole;
uint64_t below_4g_mem_size;
uint64_t above_4g_mem_size;