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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen stable-4.16] x86: Merge a domain's {cpuid,msr} policy objects
commit 5ff420f3ee30642a28d777820f44e0081cb00627
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Wed Mar 29 11:32:25 2023 +0100
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Aug 8 16:02:53 2023 +0100
x86: Merge a domain's {cpuid,msr} policy objects
Right now, they're the same underlying type, containing disjoint
information.
Drop the d->arch.msr pointer, and union d->arch.cpuid to give it a second
name
of cpu_policy in the interim.
Merge init_domain_{cpuid,msr}_policy() into a single
init_domain_cpu_policy(),
moving the implementation into cpu-policy.c
No practical change. This undoes the transient doubling of storage space
from
earlier patches.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
(cherry picked from commit bd13dae34809e61e37ba1cd5de893c5c10c46256)
---
xen/arch/x86/cpu-policy.c | 49 ++++++++++++++++++++++++++++++++++++++++
xen/arch/x86/cpuid.c | 23 -------------------
xen/arch/x86/domain.c | 15 ++++--------
xen/arch/x86/domctl.c | 35 ++++++++++++++--------------
xen/arch/x86/mm/mem_sharing.c | 3 +--
xen/arch/x86/msr.c | 44 ------------------------------------
xen/include/asm-x86/cpu-policy.h | 4 ++++
xen/include/asm-x86/cpuid.h | 3 ---
xen/include/asm-x86/domain.h | 13 ++++++++---
xen/include/asm-x86/msr.h | 1 -
10 files changed, 86 insertions(+), 104 deletions(-)
diff --git a/xen/arch/x86/cpu-policy.c b/xen/arch/x86/cpu-policy.c
index e47fbeb04d..4c5fd70cf1 100644
--- a/xen/arch/x86/cpu-policy.c
+++ b/xen/arch/x86/cpu-policy.c
@@ -1,10 +1,13 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <xen/cache.h>
#include <xen/kernel.h>
+#include <xen/sched.h>
#include <xen/lib/x86/cpu-policy.h>
#include <asm/cpu-policy.h>
+#include <asm/msr-index.h>
+#include <asm/setup.h>
struct cpu_policy __read_mostly raw_cpu_policy;
struct cpu_policy __read_mostly host_cpu_policy;
@@ -16,3 +19,49 @@ struct cpu_policy __read_mostly pv_def_cpu_policy;
struct cpu_policy __read_mostly hvm_max_cpu_policy;
struct cpu_policy __read_mostly hvm_def_cpu_policy;
#endif
+
+int init_domain_cpu_policy(struct domain *d)
+{
+ struct cpu_policy *p = is_pv_domain(d)
+ ? (IS_ENABLED(CONFIG_PV) ? &pv_def_cpu_policy : NULL)
+ : (IS_ENABLED(CONFIG_HVM) ? &hvm_def_cpu_policy : NULL);
+
+ if ( !p )
+ {
+ ASSERT_UNREACHABLE();
+ return -EOPNOTSUPP;
+ }
+
+ p = xmemdup(p);
+ if ( !p )
+ return -ENOMEM;
+
+ /* See comment in ctxt_switch_levelling() */
+ if ( !opt_dom0_cpuid_faulting && is_control_domain(d) && is_pv_domain(d) )
+ p->platform_info.cpuid_faulting = false;
+
+ /*
+ * Expose the "hardware speculation behaviour" bits of ARCH_CAPS to dom0,
+ * so dom0 can turn off workarounds as appropriate. Temporary, until the
+ * domain policy logic gains a better understanding of MSRs.
+ */
+ if ( is_hardware_domain(d) && cpu_has_arch_caps )
+ {
+ uint64_t val;
+
+ rdmsrl(MSR_ARCH_CAPABILITIES, val);
+
+ p->arch_caps.raw = val &
+ (ARCH_CAPS_RDCL_NO | ARCH_CAPS_IBRS_ALL | ARCH_CAPS_RSBA |
+ ARCH_CAPS_SSB_NO | ARCH_CAPS_MDS_NO | ARCH_CAPS_IF_PSCHANGE_MC_NO
|
+ ARCH_CAPS_TAA_NO | ARCH_CAPS_SBDR_SSDP_NO | ARCH_CAPS_FBSDP_NO |
+ ARCH_CAPS_PSDP_NO | ARCH_CAPS_FB_CLEAR | ARCH_CAPS_RRSBA |
+ ARCH_CAPS_BHI_NO | ARCH_CAPS_PBRSB_NO);
+ }
+
+ d->arch.cpu_policy = p;
+
+ recalculate_cpuid_policy(d);
+
+ return 0;
+}
diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index a70c36e569..dc0e955a12 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -753,29 +753,6 @@ void recalculate_cpuid_policy(struct domain *d)
p->extd.raw[0x19] = EMPTY_LEAF;
}
-int init_domain_cpuid_policy(struct domain *d)
-{
- struct cpuid_policy *p = is_pv_domain(d)
- ? (IS_ENABLED(CONFIG_PV) ? &pv_def_cpu_policy : NULL)
- : (IS_ENABLED(CONFIG_HVM) ? &hvm_def_cpu_policy : NULL);
-
- if ( !p )
- {
- ASSERT_UNREACHABLE();
- return -EOPNOTSUPP;
- }
-
- p = xmemdup(p);
- if ( !p )
- return -ENOMEM;
-
- d->arch.cpuid = p;
-
- recalculate_cpuid_policy(d);
-
- return 0;
-}
-
void __init init_dom0_cpuid_policy(struct domain *d)
{
struct cpuid_policy *p = d->arch.cpuid;
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 6eeb248908..a5e97d6881 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -66,6 +66,7 @@
#ifdef CONFIG_COMPAT
#include <compat/vcpu.h>
#endif
+#include <asm/cpu-policy.h>
#include <asm/psr.h>
#include <asm/pv/domain.h>
#include <asm/pv/mm.h>
@@ -742,8 +743,7 @@ int arch_domain_create(struct domain *d,
d->arch.ctxt_switch = &idle_csw;
- d->arch.cpuid = ZERO_BLOCK_PTR; /* Catch stray misuses. */
- d->arch.msr = ZERO_BLOCK_PTR;
+ d->arch.cpu_policy = ZERO_BLOCK_PTR; /* Catch stray misuses. */
return 0;
}
@@ -798,10 +798,7 @@ int arch_domain_create(struct domain *d,
goto fail;
paging_initialised = true;
- if ( (rc = init_domain_cpuid_policy(d)) )
- goto fail;
-
- if ( (rc = init_domain_msr_policy(d)) )
+ if ( (rc = init_domain_cpu_policy(d)) )
goto fail;
d->arch.ioport_caps =
@@ -872,8 +869,7 @@ int arch_domain_create(struct domain *d,
iommu_domain_destroy(d);
cleanup_domain_irq_mapping(d);
free_xenheap_page(d->shared_info);
- xfree(d->arch.cpuid);
- xfree(d->arch.msr);
+ XFREE(d->arch.cpu_policy);
if ( paging_initialised )
paging_final_teardown(d);
free_perdomain_mappings(d);
@@ -887,8 +883,7 @@ void arch_domain_destroy(struct domain *d)
hvm_domain_destroy(d);
xfree(d->arch.e820);
- xfree(d->arch.cpuid);
- xfree(d->arch.msr);
+ XFREE(d->arch.cpu_policy);
free_domain_pirqs(d);
if ( !is_idle_domain(d) )
diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 30625607a7..c8a3199bdc 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -50,11 +50,11 @@ static int gdbsx_guest_mem_io(domid_t domid, struct
xen_domctl_gdbsx_memio *iop)
static int update_domain_cpu_policy(struct domain *d,
xen_domctl_cpu_policy_t *xdpc)
{
- struct old_cpu_policy new = {};
+ struct cpu_policy *new;
struct cpu_policy *sys = is_pv_domain(d)
? (IS_ENABLED(CONFIG_PV) ? &pv_max_cpu_policy : NULL)
: (IS_ENABLED(CONFIG_HVM) ? &hvm_max_cpu_policy : NULL);
- struct old_cpu_policy old_sys = { sys, sys };
+ struct old_cpu_policy old_sys = { sys, sys }, old_new;
struct cpu_policy_errors err = INIT_CPU_POLICY_ERRORS;
int ret = -ENOMEM;
@@ -64,33 +64,33 @@ static int update_domain_cpu_policy(struct domain *d,
return -EOPNOTSUPP;
}
- /* Start by copying the domain's existing policies. */
- if ( !(new.cpuid = xmemdup(d->arch.cpuid)) ||
- !(new.msr = xmemdup(d->arch.msr)) )
+ /* Start by copying the domain's existing policy. */
+ if ( !(new = xmemdup(d->arch.cpu_policy)) )
goto out;
+ old_new = (struct old_cpu_policy){ new, new };
+
/* Merge the toolstack provided data. */
if ( (ret = x86_cpuid_copy_from_buffer(
- new.cpuid, xdpc->leaves, xdpc->nr_leaves,
+ new, xdpc->leaves, xdpc->nr_leaves,
&err.leaf, &err.subleaf)) ||
(ret = x86_msr_copy_from_buffer(
- new.msr, xdpc->msrs, xdpc->nr_msrs, &err.msr)) )
+ new, xdpc->msrs, xdpc->nr_msrs, &err.msr)) )
goto out;
/* Trim any newly-stale out-of-range leaves. */
- x86_cpuid_policy_clear_out_of_range_leaves(new.cpuid);
+ x86_cpuid_policy_clear_out_of_range_leaves(new);
/* Audit the combined dataset. */
- ret = x86_cpu_policies_are_compatible(&old_sys, &new, &err);
+ ret = x86_cpu_policies_are_compatible(&old_sys, &old_new, &err);
if ( ret )
goto out;
/*
- * Audit was successful. Replace existing policies, leaving the old
- * policies to be freed.
+ * Audit was successful. Replace the existing policy, leaving the old one
+ * to be freed.
*/
- SWAP(new.cpuid, d->arch.cpuid);
- SWAP(new.msr, d->arch.msr);
+ SWAP(new, d->arch.cpu_policy);
/* TODO: Drop when x86_cpu_policies_are_compatible() is completed. */
recalculate_cpuid_policy(d);
@@ -99,9 +99,8 @@ static int update_domain_cpu_policy(struct domain *d,
domain_cpu_policy_changed(d);
out:
- /* Free whichever cpuid/msr structs are not installed in struct domain. */
- xfree(new.cpuid);
- xfree(new.msr);
+ /* Free whichever struct is not installed in struct domain. */
+ xfree(new);
if ( ret )
{
@@ -1342,7 +1341,7 @@ long arch_do_domctl(
if ( guest_handle_is_null(domctl->u.cpu_policy.leaves) )
domctl->u.cpu_policy.nr_leaves = CPUID_MAX_SERIALISED_LEAVES;
else if ( (ret = x86_cpuid_copy_to_buffer(
- d->arch.cpuid,
+ d->arch.cpu_policy,
domctl->u.cpu_policy.leaves,
&domctl->u.cpu_policy.nr_leaves)) )
break;
@@ -1351,7 +1350,7 @@ long arch_do_domctl(
if ( guest_handle_is_null(domctl->u.cpu_policy.msrs) )
domctl->u.cpu_policy.nr_msrs = MSR_MAX_SERIALISED_ENTRIES;
else if ( (ret = x86_msr_copy_to_buffer(
- d->arch.msr,
+ d->arch.cpu_policy,
domctl->u.cpu_policy.msrs,
&domctl->u.cpu_policy.nr_msrs)) )
break;
diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c
index 74d2869c0e..3fa7ad3399 100644
--- a/xen/arch/x86/mm/mem_sharing.c
+++ b/xen/arch/x86/mm/mem_sharing.c
@@ -1843,8 +1843,7 @@ static int fork(struct domain *cd, struct domain *d)
domain_pause(d);
cd->max_pages = d->max_pages;
- *cd->arch.cpuid = *d->arch.cpuid;
- *cd->arch.msr = *d->arch.msr;
+ *cd->arch.cpu_policy = *d->arch.cpu_policy;
cd->vmtrace_size = d->vmtrace_size;
cd->parent = d;
}
diff --git a/xen/arch/x86/msr.c b/xen/arch/x86/msr.c
index 7819c1de4d..21a891d635 100644
--- a/xen/arch/x86/msr.c
+++ b/xen/arch/x86/msr.c
@@ -120,50 +120,6 @@ void __init init_guest_msr_policy(void)
}
}
-int init_domain_msr_policy(struct domain *d)
-{
- struct msr_policy *mp = is_pv_domain(d)
- ? (IS_ENABLED(CONFIG_PV) ? &pv_def_cpu_policy : NULL)
- : (IS_ENABLED(CONFIG_HVM) ? &hvm_def_cpu_policy : NULL);
-
- if ( !mp )
- {
- ASSERT_UNREACHABLE();
- return -EOPNOTSUPP;
- }
-
- mp = xmemdup(mp);
- if ( !mp )
- return -ENOMEM;
-
- /* See comment in ctxt_switch_levelling() */
- if ( !opt_dom0_cpuid_faulting && is_control_domain(d) && is_pv_domain(d) )
- mp->platform_info.cpuid_faulting = false;
-
- /*
- * Expose the "hardware speculation behaviour" bits of ARCH_CAPS to dom0,
- * so dom0 can turn off workarounds as appropriate. Temporary, until the
- * domain policy logic gains a better understanding of MSRs.
- */
- if ( is_hardware_domain(d) && cpu_has_arch_caps )
- {
- uint64_t val;
-
- rdmsrl(MSR_ARCH_CAPABILITIES, val);
-
- mp->arch_caps.raw = val &
- (ARCH_CAPS_RDCL_NO | ARCH_CAPS_IBRS_ALL | ARCH_CAPS_RSBA |
- ARCH_CAPS_SSB_NO | ARCH_CAPS_MDS_NO | ARCH_CAPS_IF_PSCHANGE_MC_NO
|
- ARCH_CAPS_TAA_NO | ARCH_CAPS_SBDR_SSDP_NO | ARCH_CAPS_FBSDP_NO |
- ARCH_CAPS_PSDP_NO | ARCH_CAPS_FB_CLEAR | ARCH_CAPS_RRSBA |
- ARCH_CAPS_BHI_NO | ARCH_CAPS_PBRSB_NO);
- }
-
- d->arch.msr = mp;
-
- return 0;
-}
-
int init_vcpu_msr_policy(struct vcpu *v)
{
struct vcpu_msrs *msrs = xzalloc(struct vcpu_msrs);
diff --git a/xen/include/asm-x86/cpu-policy.h b/xen/include/asm-x86/cpu-policy.h
index eef14bb426..9ba34bbf5e 100644
--- a/xen/include/asm-x86/cpu-policy.h
+++ b/xen/include/asm-x86/cpu-policy.h
@@ -3,6 +3,7 @@
#define X86_CPU_POLICY_H
struct cpu_policy;
+struct domain;
extern struct cpu_policy raw_cpu_policy;
extern struct cpu_policy host_cpu_policy;
@@ -11,4 +12,7 @@ extern struct cpu_policy pv_def_cpu_policy;
extern struct cpu_policy hvm_max_cpu_policy;
extern struct cpu_policy hvm_def_cpu_policy;
+/* Allocate and initialise a CPU policy suitable for the domain. */
+int init_domain_cpu_policy(struct domain *d);
+
#endif /* X86_CPU_POLICY_H */
diff --git a/xen/include/asm-x86/cpuid.h b/xen/include/asm-x86/cpuid.h
index ea05862773..7f81b998ce 100644
--- a/xen/include/asm-x86/cpuid.h
+++ b/xen/include/asm-x86/cpuid.h
@@ -49,9 +49,6 @@ extern struct cpuidmasks cpuidmask_defaults;
/* Check that all previously present features are still available. */
bool recheck_cpu_features(unsigned int cpu);
-/* Allocate and initialise a CPUID policy suitable for the domain. */
-int init_domain_cpuid_policy(struct domain *d);
-
/* Apply dom0-specific tweaks to the CPUID policy. */
void init_dom0_cpuid_policy(struct domain *d);
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index e4c099262c..92937d9d73 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -379,9 +379,16 @@ struct arch_domain
*/
uint8_t x87_fip_width;
- /* CPUID and MSR policy objects. */
- struct cpuid_policy *cpuid;
- struct msr_policy *msr;
+ /*
+ * The domain's CPU Policy. "cpu_policy" is considered the canonical
+ * pointer, but the "cpuid" and "msr" aliases exist so the most
+ * appropriate one can be used for local code clarity.
+ */
+ union {
+ struct cpu_policy *cpu_policy;
+ struct cpu_policy *cpuid;
+ struct cpu_policy *msr;
+ };
struct PITState vpit;
diff --git a/xen/include/asm-x86/msr.h b/xen/include/asm-x86/msr.h
index f2c0022fec..38984f2b94 100644
--- a/xen/include/asm-x86/msr.h
+++ b/xen/include/asm-x86/msr.h
@@ -376,7 +376,6 @@ struct vcpu_msrs
};
void init_guest_msr_policy(void);
-int init_domain_msr_policy(struct domain *d);
int init_vcpu_msr_policy(struct vcpu *v);
/*
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.16
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