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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] x86/vmx: add hvm functions to get/set non-register state
commit 010bc50adaf58c78db4ad1329b0130d96e13f8e2
Author: Tamas K Lengyel <tamas.lengyel@xxxxxxxxx>
AuthorDate: Wed Apr 27 09:13:39 2022 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Apr 27 09:13:39 2022 +0200
x86/vmx: add hvm functions to get/set non-register state
During VM forking and resetting a failed vmentry has been observed due
to the guest non-register state going out-of-sync with the guest register
state. For example, a VM fork reset right after a STI instruction can
trigger
the failed entry. This is due to the guest non-register state not being
saved
from the parent VM, thus the reset operation only copies the register state.
Fix this by adding a new pair of hvm functions to get/set the guest
non-register state so that the overall vCPU state remains in sync.
Signed-off-by: Tamas K Lengyel <tamas.lengyel@xxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/x86/hvm/vmx/vmx.c | 32 ++++++++++++++++++++++++++++++++
xen/arch/x86/include/asm/hvm/hvm.h | 29 +++++++++++++++++++++++++++++
xen/arch/x86/mm/mem_sharing.c | 12 +++++++++++-
3 files changed, 72 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index cc8c4e9f04..d03e78bf0d 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -1334,6 +1334,36 @@ static void cf_check vmx_set_interrupt_shadow(
__vmwrite(GUEST_INTERRUPTIBILITY_INFO, intr_shadow);
}
+static void cf_check vmx_get_nonreg_state(struct vcpu *v,
+ struct hvm_vcpu_nonreg_state *nrs)
+{
+ vmx_vmcs_enter(v);
+
+ __vmread(GUEST_ACTIVITY_STATE, &nrs->vmx.activity_state);
+ __vmread(GUEST_INTERRUPTIBILITY_INFO, &nrs->vmx.interruptibility_info);
+ __vmread(GUEST_PENDING_DBG_EXCEPTIONS, &nrs->vmx.pending_dbg);
+
+ if ( cpu_has_vmx_virtual_intr_delivery )
+ __vmread(GUEST_INTR_STATUS, &nrs->vmx.interrupt_status);
+
+ vmx_vmcs_exit(v);
+}
+
+static void cf_check vmx_set_nonreg_state(struct vcpu *v,
+ struct hvm_vcpu_nonreg_state *nrs)
+{
+ vmx_vmcs_enter(v);
+
+ __vmwrite(GUEST_ACTIVITY_STATE, nrs->vmx.activity_state);
+ __vmwrite(GUEST_INTERRUPTIBILITY_INFO, nrs->vmx.interruptibility_info);
+ __vmwrite(GUEST_PENDING_DBG_EXCEPTIONS, nrs->vmx.pending_dbg);
+
+ if ( cpu_has_vmx_virtual_intr_delivery )
+ __vmwrite(GUEST_INTR_STATUS, nrs->vmx.interrupt_status);
+
+ vmx_vmcs_exit(v);
+}
+
static void vmx_load_pdptrs(struct vcpu *v)
{
uint32_t cr3 = v->arch.hvm.guest_cr[3];
@@ -2487,6 +2517,8 @@ static struct hvm_function_table __initdata_cf_clobber
vmx_function_table = {
.load_cpu_ctxt = vmx_load_vmcs_ctxt,
.get_interrupt_shadow = vmx_get_interrupt_shadow,
.set_interrupt_shadow = vmx_set_interrupt_shadow,
+ .get_nonreg_state = vmx_get_nonreg_state,
+ .set_nonreg_state = vmx_set_nonreg_state,
.guest_x86_mode = vmx_guest_x86_mode,
.get_cpl = _vmx_get_cpl,
.get_segment_register = vmx_get_segment_register,
diff --git a/xen/arch/x86/include/asm/hvm/hvm.h
b/xen/arch/x86/include/asm/hvm/hvm.h
index 5b7ec0cf69..caaeacabc7 100644
--- a/xen/arch/x86/include/asm/hvm/hvm.h
+++ b/xen/arch/x86/include/asm/hvm/hvm.h
@@ -84,6 +84,17 @@ enum hvm_intblk {
/* update_guest_cr() flags. */
#define HVM_UPDATE_GUEST_CR3_NOFLUSH 0x00000001
+struct hvm_vcpu_nonreg_state {
+ union {
+ struct {
+ uint64_t activity_state;
+ uint64_t interruptibility_info;
+ uint64_t pending_dbg;
+ uint64_t interrupt_status;
+ } vmx;
+ };
+};
+
/*
* The hardware virtual machine (HVM) interface abstracts away from the
* x86/x86_64 CPU virtualization assist specifics. Currently this interface
@@ -122,6 +133,10 @@ struct hvm_function_table {
/* Examine specifics of the guest state. */
unsigned int (*get_interrupt_shadow)(struct vcpu *v);
void (*set_interrupt_shadow)(struct vcpu *v, unsigned int intr_shadow);
+ void (*get_nonreg_state)(struct vcpu *v,
+ struct hvm_vcpu_nonreg_state *nrs);
+ void (*set_nonreg_state)(struct vcpu *v,
+ struct hvm_vcpu_nonreg_state *nrs);
int (*guest_x86_mode)(struct vcpu *v);
unsigned int (*get_cpl)(struct vcpu *v);
void (*get_segment_register)(struct vcpu *v, enum x86_segment seg,
@@ -744,6 +759,20 @@ void hvm_set_reg(struct vcpu *v, unsigned int reg,
uint64_t val);
d_->arch.hvm.pi_ops.vcpu_block(v_); \
})
+static inline void hvm_get_nonreg_state(struct vcpu *v,
+ struct hvm_vcpu_nonreg_state *nrs)
+{
+ if ( hvm_funcs.get_nonreg_state )
+ alternative_vcall(hvm_funcs.get_nonreg_state, v, nrs);
+}
+
+static inline void hvm_set_nonreg_state(struct vcpu *v,
+ struct hvm_vcpu_nonreg_state *nrs)
+{
+ if ( hvm_funcs.set_nonreg_state )
+ alternative_vcall(hvm_funcs.set_nonreg_state, v, nrs);
+}
+
#else /* CONFIG_HVM */
#define hvm_enabled false
diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c
index a5c16b4429..61538c3fb2 100644
--- a/xen/arch/x86/mm/mem_sharing.c
+++ b/xen/arch/x86/mm/mem_sharing.c
@@ -1645,6 +1645,14 @@ static int bring_up_vcpus(struct domain *cd, struct
domain *d)
return 0;
}
+static void copy_vcpu_nonreg_state(struct vcpu *d_vcpu, struct vcpu *cd_vcpu)
+{
+ struct hvm_vcpu_nonreg_state nrs = {};
+
+ hvm_get_nonreg_state(d_vcpu, &nrs);
+ hvm_set_nonreg_state(cd_vcpu, &nrs);
+}
+
static int copy_vcpu_settings(struct domain *cd, const struct domain *d)
{
unsigned int i;
@@ -1653,7 +1661,7 @@ static int copy_vcpu_settings(struct domain *cd, const
struct domain *d)
for ( i = 0; i < cd->max_vcpus; i++ )
{
- const struct vcpu *d_vcpu = d->vcpu[i];
+ struct vcpu *d_vcpu = d->vcpu[i];
struct vcpu *cd_vcpu = cd->vcpu[i];
mfn_t vcpu_info_mfn;
@@ -1696,6 +1704,8 @@ static int copy_vcpu_settings(struct domain *cd, const
struct domain *d)
hvm_vmtrace_reset(cd_vcpu);
+ copy_vcpu_nonreg_state(d_vcpu, cd_vcpu);
+
/*
* TODO: to support VMs with PV interfaces copy additional
* settings here, such as PV timers.
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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