|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3/6] x86: Handle the Xen MSRs via the new guest_{rd, wr}msr() infrastructure
Dispatch from the guest_{rd,wr}msr() functions, after falling through from the
!is_viridian_domain() case.
Rename {rd,wr}msr_hypervisor_regs() to guest_{rd,wr}msr_xen() for consistency,
and because the _regs suffix isn't very appropriate.
Update them to take a vcpu pointer rather than presuming that they act on
current, and switch to using X86EMUL_* return values.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Jun Nakajima <jun.nakajima@xxxxxxxxx>
CC: Paul Durrant <paul.durrant@xxxxxxxxxx>
CC: Kevin Tian <kevin.tian@xxxxxxxxx>
CC: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
CC: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
---
xen/arch/x86/hvm/svm/svm.c | 25 ++++---------------------
xen/arch/x86/hvm/vmx/vmx.c | 24 ++++--------------------
xen/arch/x86/msr.c | 8 ++++++++
xen/arch/x86/pv/emul-priv-op.c | 6 ------
xen/arch/x86/traps.c | 33 ++++++++++++++++-----------------
xen/include/asm-x86/processor.h | 4 ++--
6 files changed, 34 insertions(+), 66 deletions(-)
diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index 6d8ed5c..f90a7b4 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -1967,9 +1967,6 @@ static int svm_msr_read_intercept(unsigned int msr,
uint64_t *msr_content)
else if ( ret )
break;
- if ( rdmsr_hypervisor_regs(msr, msr_content) )
- break;
-
if ( rdmsr_safe(msr, *msr_content) == 0 )
break;
@@ -2122,25 +2119,11 @@ static int svm_msr_write_intercept(unsigned int msr,
uint64_t msr_content)
else if ( ret )
break;
- switch ( wrmsr_hypervisor_regs(msr, msr_content) )
- {
- case -ERESTART:
- result = X86EMUL_RETRY;
- break;
- case 0:
- /*
- * Match up with the RDMSR side for now; ultimately this entire
- * case block should go away.
- */
- if ( rdmsr_safe(msr, msr_content) == 0 )
- break;
- goto gpf;
- case 1:
+ /* Match up with the RDMSR side; ultimately this should go away. */
+ if ( rdmsr_safe(msr, msr_content) == 0 )
break;
- default:
- goto gpf;
- }
- break;
+
+ goto gpf;
}
if ( sync )
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 5bf6f62..6caaabc 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2871,9 +2871,6 @@ static int vmx_msr_read_intercept(unsigned int msr,
uint64_t *msr_content)
break;
}
- if ( rdmsr_hypervisor_regs(msr, msr_content) )
- break;
-
if ( rdmsr_safe(msr, *msr_content) == 0 )
break;
@@ -3115,24 +3112,11 @@ static int vmx_msr_write_intercept(unsigned int msr,
uint64_t msr_content)
is_last_branch_msr(msr) )
break;
- switch ( wrmsr_hypervisor_regs(msr, msr_content) )
- {
- case -ERESTART:
- return X86EMUL_RETRY;
- case 0:
- /*
- * Match up with the RDMSR side for now; ultimately this
- * entire case block should go away.
- */
- if ( rdmsr_safe(msr, msr_content) == 0 )
- break;
- goto gp_fault;
- case 1:
+ /* Match up with the RDMSR side; ultimately this should go away. */
+ if ( rdmsr_safe(msr, msr_content) == 0 )
break;
- default:
- goto gp_fault;
- }
- break;
+
+ goto gp_fault;
}
return X86EMUL_OKAY;
diff --git a/xen/arch/x86/msr.c b/xen/arch/x86/msr.c
index 2ff9361..9f20fd8 100644
--- a/xen/arch/x86/msr.c
+++ b/xen/arch/x86/msr.c
@@ -183,6 +183,10 @@ int guest_rdmsr(const struct vcpu *v, uint32_t msr,
uint64_t *val)
}
/* Fallthrough. */
+ case 0x40000200 ... 0x400002ff:
+ ret = guest_rdmsr_xen(v, msr, val);
+ goto out;
+
default:
return X86EMUL_UNHANDLEABLE;
}
@@ -274,6 +278,10 @@ int guest_wrmsr(struct vcpu *v, uint32_t msr, uint64_t val)
}
/* Fallthrough. */
+ case 0x40000200 ... 0x400002ff:
+ ret = guest_wrmsr_xen(v, msr, val);
+ goto out;
+
default:
return X86EMUL_UNHANDLEABLE;
}
diff --git a/xen/arch/x86/pv/emul-priv-op.c b/xen/arch/x86/pv/emul-priv-op.c
index 17aaf97..97fcac0 100644
--- a/xen/arch/x86/pv/emul-priv-op.c
+++ b/xen/arch/x86/pv/emul-priv-op.c
@@ -974,9 +974,6 @@ static int read_msr(unsigned int reg, uint64_t *val,
}
/* fall through */
default:
- if ( rdmsr_hypervisor_regs(reg, val) )
- return X86EMUL_OKAY;
-
rc = vmce_rdmsr(reg, val);
if ( rc < 0 )
break;
@@ -1173,9 +1170,6 @@ static int write_msr(unsigned int reg, uint64_t val,
}
/* fall through */
default:
- if ( wrmsr_hypervisor_regs(reg, val) == 1 )
- return X86EMUL_OKAY;
-
rc = vmce_wrmsr(reg, val);
if ( rc < 0 )
break;
diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index 27190e0..cd5b223 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -776,29 +776,26 @@ static void do_trap(struct cpu_user_regs *regs)
trapnr, trapstr(trapnr), regs->error_code);
}
-/* Returns 0 if not handled, and non-0 for success. */
-int rdmsr_hypervisor_regs(uint32_t idx, uint64_t *val)
+int guest_rdmsr_xen(const struct vcpu *v, uint32_t idx, uint64_t *val)
{
- struct domain *d = current->domain;
+ const struct domain *d = v->domain;
/* Optionally shift out of the way of Viridian architectural MSRs. */
uint32_t base = is_viridian_domain(d) ? 0x40000200 : 0x40000000;
switch ( idx - base )
{
case 0: /* Write hypercall page MSR. Read as zero. */
- {
*val = 0;
- return 1;
- }
- }
+ return X86EMUL_OKAY;
- return 0;
+ default:
+ return X86EMUL_EXCEPTION;
+ }
}
-/* Returns 1 if handled, 0 if not and -Exx for error. */
-int wrmsr_hypervisor_regs(uint32_t idx, uint64_t val)
+int guest_wrmsr_xen(struct vcpu *v, uint32_t idx, uint64_t val)
{
- struct domain *d = current->domain;
+ struct domain *d = v->domain;
/* Optionally shift out of the way of Viridian architectural MSRs. */
uint32_t base = is_viridian_domain(d) ? 0x40000200 : 0x40000000;
@@ -817,7 +814,7 @@ int wrmsr_hypervisor_regs(uint32_t idx, uint64_t val)
gdprintk(XENLOG_WARNING,
"wrmsr hypercall page index %#x unsupported\n",
page_index);
- return 0;
+ goto gp_fault;
}
page = get_page_from_gfn(d, gmfn, &t, P2M_ALLOC);
@@ -830,13 +827,13 @@ int wrmsr_hypervisor_regs(uint32_t idx, uint64_t val)
if ( p2m_is_paging(t) )
{
p2m_mem_paging_populate(d, gmfn);
- return -ERESTART;
+ return X86EMUL_RETRY;
}
gdprintk(XENLOG_WARNING,
"Bad GMFN %lx (MFN %lx) to MSR %08x\n",
gmfn, page ? page_to_mfn(page) : -1UL, base);
- return 0;
+ goto gp_fault;
}
hypercall_page = __map_domain_page(page);
@@ -844,11 +841,13 @@ int wrmsr_hypervisor_regs(uint32_t idx, uint64_t val)
unmap_domain_page(hypercall_page);
put_page_and_type(page);
- return 1;
- }
+ return X86EMUL_OKAY;
}
- return 0;
+ gp_fault:
+ default:
+ return X86EMUL_EXCEPTION;
+ }
}
void cpuid_hypervisor_leaves(const struct vcpu *v, uint32_t leaf,
diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index 9c70a98..14df6bd 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -521,8 +521,8 @@ unsigned long alloc_stub_page(unsigned int cpu, unsigned
long *mfn);
void cpuid_hypervisor_leaves(const struct vcpu *v, uint32_t leaf,
uint32_t subleaf, struct cpuid_leaf *res);
-int rdmsr_hypervisor_regs(uint32_t idx, uint64_t *val);
-int wrmsr_hypervisor_regs(uint32_t idx, uint64_t val);
+int guest_rdmsr_xen(const struct vcpu *v, uint32_t idx, uint64_t *val);
+int guest_wrmsr_xen(struct vcpu *v, uint32_t idx, uint64_t val);
void microcode_set_module(unsigned int);
int microcode_update(XEN_GUEST_HANDLE_PARAM(const_void), unsigned long len);
--
2.1.4
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |