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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v1 1/5] x86/msr: introduce struct msr_domain_policy
The new structure contains information about guest's MSRs that are
shared between all domain's vCPUs. It starts with only 1 MSR:
MSR_INTEL_PLATFORM_INFO
Which currently has only 1 usable bit: cpuid_faulting.
Add 2 global policy objects: hvm_max and pv_max that are inited during
boot up. It's always possible to emulate CPUID faulting for HVM guests
while for PV guests the H/W support is required.
Add init_domain_msr_policy() which sets initial MSR policy during
domain creation with a special case for Dom0.
Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
---
xen/arch/x86/Makefile | 1 +
xen/arch/x86/domain.c | 6 +++
xen/arch/x86/msr.c | 95 ++++++++++++++++++++++++++++++++++++++++++++
xen/arch/x86/setup.c | 1 +
xen/include/asm-x86/domain.h | 3 +-
xen/include/asm-x86/msr.h | 13 ++++++
6 files changed, 118 insertions(+), 1 deletion(-)
create mode 100644 xen/arch/x86/msr.c
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 93ead6e5dd..d5d58a205e 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -35,6 +35,7 @@ obj-y += i8259.o
obj-y += io_apic.o
obj-$(CONFIG_LIVEPATCH) += alternative.o livepatch.o
obj-y += msi.o
+obj-y += msr.o
obj-y += ioport_emulate.o
obj-y += irq.o
obj-$(CONFIG_KEXEC) += machine_kexec.o
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index baaf8151d2..620666b33a 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -425,6 +425,7 @@ int arch_domain_create(struct domain *d, unsigned int
domcr_flags,
{
d->arch.emulation_flags = 0;
d->arch.cpuid = ZERO_BLOCK_PTR; /* Catch stray misuses. */
+ d->arch.msr = ZERO_BLOCK_PTR;
}
else
{
@@ -470,6 +471,9 @@ int arch_domain_create(struct domain *d, unsigned int
domcr_flags,
if ( (rc = init_domain_cpuid_policy(d)) )
goto fail;
+ if ( (rc = init_domain_msr_policy(d)) )
+ goto fail;
+
d->arch.ioport_caps =
rangeset_new(d, "I/O Ports", RANGESETF_prettyprint_hex);
rc = -ENOMEM;
@@ -540,6 +544,7 @@ int arch_domain_create(struct domain *d, unsigned int
domcr_flags,
cleanup_domain_irq_mapping(d);
free_xenheap_page(d->shared_info);
xfree(d->arch.cpuid);
+ xfree(d->arch.msr);
if ( paging_initialised )
paging_final_teardown(d);
free_perdomain_mappings(d);
@@ -554,6 +559,7 @@ void arch_domain_destroy(struct domain *d)
xfree(d->arch.e820);
xfree(d->arch.cpuid);
+ xfree(d->arch.msr);
free_domain_pirqs(d);
if ( !is_idle_domain(d) )
diff --git a/xen/arch/x86/msr.c b/xen/arch/x86/msr.c
new file mode 100644
index 0000000000..eac50ec897
--- /dev/null
+++ b/xen/arch/x86/msr.c
@@ -0,0 +1,95 @@
+/******************************************************************************
+ * arch/x86/msr.c
+ *
+ * Policy objects for Model-Specific Registers.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (c) 2017 Citrix Systems Ltd.
+ */
+
+#include <xen/init.h>
+#include <xen/lib.h>
+#include <xen/sched.h>
+#include <asm/msr.h>
+
+struct msr_domain_policy __read_mostly hvm_max_msr_domain_policy,
+ __read_mostly pv_max_msr_domain_policy;
+
+static void __init calculate_hvm_max_policy(void)
+{
+ struct msr_domain_policy *dp = &hvm_max_msr_domain_policy;
+
+ if ( !hvm_enabled )
+ return;
+
+ /* 0x000000ce MSR_INTEL_PLATFORM_INFO */
+ if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL )
+ {
+ dp->plaform_info.available = true;
+ dp->plaform_info.cpuid_faulting = true;
+ }
+}
+
+static void __init calculate_pv_max_policy(void)
+{
+ struct msr_domain_policy *dp = &pv_max_msr_domain_policy;
+
+ /* 0x000000ce MSR_INTEL_PLATFORM_INFO */
+ if ( cpu_has_cpuid_faulting )
+ {
+ dp->plaform_info.available = true;
+ dp->plaform_info.cpuid_faulting = true;
+ }
+}
+
+void __init init_guest_msr_policy(void)
+{
+ calculate_hvm_max_policy();
+ calculate_pv_max_policy();
+}
+
+int init_domain_msr_policy(struct domain *d)
+{
+ struct msr_domain_policy *dp;
+
+ dp = xmalloc(struct msr_domain_policy);
+
+ if ( !dp )
+ return -ENOMEM;
+
+ *dp = is_pv_domain(d) ? pv_max_msr_domain_policy :
+ hvm_max_msr_domain_policy;
+
+ /* See comment in intel_ctxt_switch_levelling() */
+ if ( is_control_domain(d) )
+ {
+ dp->plaform_info.available = false;
+ dp->plaform_info.cpuid_faulting = false;
+ }
+
+ d->arch.msr = dp;
+
+ return 0;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index db5df6956d..b9a769d92c 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1560,6 +1560,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
panic("Could not protect TXT memory regions");
init_guest_cpuid();
+ init_guest_msr_policy();
if ( dom0_pvh )
{
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index c10522b7f5..f08ede3a05 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -356,8 +356,9 @@ struct arch_domain
*/
uint8_t x87_fip_width;
- /* CPUID Policy. */
+ /* CPUID and MSR policy objects. */
struct cpuid_policy *cpuid;
+ struct msr_domain_policy *msr;
struct PITState vpit;
diff --git a/xen/include/asm-x86/msr.h b/xen/include/asm-x86/msr.h
index 7004b6f398..5cf7be1821 100644
--- a/xen/include/asm-x86/msr.h
+++ b/xen/include/asm-x86/msr.h
@@ -202,6 +202,19 @@ void write_efer(u64 val);
DECLARE_PER_CPU(u32, ler_msr);
+/* MSR policy object for shared per-domain MSRs */
+struct msr_domain_policy
+{
+ /* 0x000000ce MSR_INTEL_PLATFORM_INFO */
+ struct {
+ bool available; /* This MSR is non-architectural */
+ bool cpuid_faulting;
+ } plaform_info;
+};
+
+void init_guest_msr_policy(void);
+int init_domain_msr_policy(struct domain *d);
+
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_MSR_H */
--
2.11.0
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