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[RFC PATCH 16/21] i386/xen: handle register_vcpu_time_memory_area
From: |
David Woodhouse |
Subject: |
[RFC PATCH 16/21] i386/xen: handle register_vcpu_time_memory_area |
Date: |
Mon, 5 Dec 2022 17:31:32 +0000 |
From: Joao Martins <joao.m.martins@oracle.com>
In order to support Linux vdso in Xen.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
target/i386/xen.c | 36 +++++++++++++++++++++++++++++++++---
1 file changed, 33 insertions(+), 3 deletions(-)
diff --git a/target/i386/xen.c b/target/i386/xen.c
index 59aca2ad19..1def526e08 100644
--- a/target/i386/xen.c
+++ b/target/i386/xen.c
@@ -43,17 +43,22 @@ static void *gpa_to_hva(uint64_t gpa)
mrs.offset_within_region);
}
-static void *gva_to_hva(CPUState *cs, uint64_t gva)
+static uint64_t gva_to_gpa(CPUState *cs, uint64_t gva)
{
struct kvm_translation t = { .linear_address = gva };
int err;
err = kvm_vcpu_ioctl(cs, KVM_TRANSLATE, &t);
if (err || !t.valid) {
- return NULL;
+ return 0;
}
- return gpa_to_hva(t.physical_address);
+ return t.physical_address;
+}
+
+static void *gva_to_hva(CPUState *cs, uint64_t gva)
+{
+ return gpa_to_hva(gva_to_gpa(cs, gva));
}
int kvm_xen_init(KVMState *s, uint32_t xen_version)
@@ -244,6 +249,27 @@ static int vcpuop_register_vcpu_info(CPUState *cs,
CPUState *target,
return xen_set_vcpu_attr(target, KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO, gpa);
}
+static int vcpuop_register_vcpu_time_info(CPUState *cs, CPUState *target,
+ uint64_t arg)
+{
+ struct vcpu_register_time_memory_area *tma;
+ uint64_t gpa;
+ void *hva;
+
+ tma = gva_to_hva(cs, arg);
+ if (!tma) {
+ return -EFAULT;
+ }
+
+ hva = gva_to_hva(cs, tma->addr.p);
+ if (!hva || !tma->addr.p) {
+ return -EFAULT;
+ }
+
+ gpa = gva_to_gpa(cs, tma->addr.p);
+ return xen_set_vcpu_attr(target, KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO,
gpa);
+}
+
static int kvm_xen_hcall_vcpu_op(struct kvm_xen_exit *exit, X86CPU *cpu,
int cmd, int vcpu_id, uint64_t arg)
{
@@ -252,6 +278,10 @@ static int kvm_xen_hcall_vcpu_op(struct kvm_xen_exit
*exit, X86CPU *cpu,
int err = -ENOSYS;
switch (cmd) {
+ case VCPUOP_register_vcpu_time_memory_area: {
+ err = vcpuop_register_vcpu_time_info(cs, dest, arg);
+ break;
+ }
case VCPUOP_register_vcpu_info: {
err = vcpuop_register_vcpu_info(cs, dest, arg);
break;
--
2.35.3
- [RFC PATCH 03/21] i386/kvm: handle Xen HVM cpuid leaves, (continued)
[RFC PATCH 17/21] i386/xen: handle register_runstate_memory_area, David Woodhouse, 2022/12/05
[RFC PATCH 13/21] i386/xen: implement HYPERVISOR_hvm_op, David Woodhouse, 2022/12/05
[RFC PATCH 05/21] hw/xen_backend: refactor xen_be_init(), David Woodhouse, 2022/12/05
[RFC PATCH 16/21] i386/xen: handle register_vcpu_time_memory_area,
David Woodhouse <=
[RFC PATCH 11/21] i386/xen: implement HYPERCALL_xen_version, David Woodhouse, 2022/12/05
[RFC PATCH 09/21] pc_piix: allow xenfv machine with XEN_EMULATE, David Woodhouse, 2022/12/05
[RFC PATCH 18/21] kvm/ioapic: mark gsi-2 used in ioapic routing init, David Woodhouse, 2022/12/05
[RFC PATCH 07/21] xen-platform-pci: register xen-mmio as RAM for XEN_EMULATE, David Woodhouse, 2022/12/05
[RFC PATCH 15/21] i386/xen: handle register_vcpu_info, David Woodhouse, 2022/12/05
[RFC PATCH 12/21] i386/xen: set shared_info page, David Woodhouse, 2022/12/05