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[RFC PATCH v2 17/21] kvm: handle KVM_EXIT_MEMORY_FAULT
From: |
Xiaoyao Li |
Subject: |
[RFC PATCH v2 17/21] kvm: handle KVM_EXIT_MEMORY_FAULT |
Date: |
Wed, 13 Sep 2023 23:51:13 -0400 |
From: Chao Peng <chao.p.peng@linux.intel.com>
Currently only KVM_MEMORY_EXIT_FLAG_PRIVATE in flags is valid when
KVM_EXIT_MEMORY_FAULT happens. It indicates userspace needs to do
the memory conversion on the RAMBlock to turn the memory into desired
attribute, i.e., private/shared.
Note, KVM_EXIT_MEMORY_FAULT makes sense only when the RAMBlock has
gmem memory backend.
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
accel/kvm/kvm-all.c | 54 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 7e32ee83b258..c67aa66b0559 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -3040,6 +3040,50 @@ static void kvm_eat_signals(CPUState *cpu)
} while (sigismember(&chkset, SIG_IPI));
}
+static int kvm_convert_memory(hwaddr start, hwaddr size, bool to_private)
+{
+ MemoryRegionSection section;
+ ram_addr_t offset;
+ RAMBlock *rb;
+ void *addr;
+ int ret = -1;
+
+ section = memory_region_find(get_system_memory(), start, size);
+ if (!section.mr) {
+ return ret;
+ }
+
+ if (memory_region_has_gmem_fd(section.mr)) {
+ if (to_private) {
+ ret = kvm_set_memory_attributes_private(start, size);
+ } else {
+ ret = kvm_set_memory_attributes_shared(start, size);
+ }
+
+ if (ret) {
+ memory_region_unref(section.mr);
+ return ret;
+ }
+
+ addr = memory_region_get_ram_ptr(section.mr) +
+ section.offset_within_region;
+ rb = qemu_ram_block_from_host(addr, false, &offset);
+ /*
+ * With KVM_SET_MEMORY_ATTRIBUTES by kvm_set_memory_attributes(),
+ * operation on underlying file descriptor is only for releasing
+ * unnecessary pages.
+ */
+ ram_block_convert_range(rb, offset, size, to_private);
+ } else {
+ warn_report("Convert non guest-memfd backed memory region "
+ "(0x%"HWADDR_PRIx" ,+ 0x%"HWADDR_PRIx") to %s",
+ start, size, to_private ? "private" : "shared");
+ }
+
+ memory_region_unref(section.mr);
+ return ret;
+}
+
int kvm_cpu_exec(CPUState *cpu)
{
struct kvm_run *run = cpu->kvm_run;
@@ -3198,6 +3242,16 @@ int kvm_cpu_exec(CPUState *cpu)
break;
}
break;
+ case KVM_EXIT_MEMORY_FAULT:
+ if (run->memory.flags & ~KVM_MEMORY_EXIT_FLAG_PRIVATE) {
+ error_report("KVM_EXIT_MEMORY_FAULT: Unknown flag 0x%" PRIx64,
+ (uint64_t)run->memory.flags);
+ ret = -1;
+ break;
+ }
+ ret = kvm_convert_memory(run->memory.gpa, run->memory.size,
+ run->memory.flags &
KVM_MEMORY_EXIT_FLAG_PRIVATE);
+ break;
default:
DPRINTF("kvm_arch_handle_exit\n");
ret = kvm_arch_handle_exit(cpu, run);
--
2.34.1
- Re: [RFC PATCH v2 07/21] i386/pc: Drop pc_machine_kvm_type(), (continued)
[RFC PATCH v2 08/21] target/i386: Implement mc->kvm_type() to get VM type, Xiaoyao Li, 2023/09/13
[RFC PATCH v2 09/21] target/i386: Introduce kvm_confidential_guest_init(), Xiaoyao Li, 2023/09/13
[RFC PATCH v2 10/21] i386/kvm: Implement kvm_sw_protected_vm_init() for sw-protcted-vm specific functions, Xiaoyao Li, 2023/09/13
[RFC PATCH v2 11/21] kvm: Introduce support for memory_attributes, Xiaoyao Li, 2023/09/13
[RFC PATCH v2 12/21] kvm/memory: Introduce the infrastructure to set the default shared/private value, Xiaoyao Li, 2023/09/13
[RFC PATCH v2 13/21] i386/kvm: Set memory to default private for KVM_X86_SW_PROTECTED_VM, Xiaoyao Li, 2023/09/13
[RFC PATCH v2 14/21] physmem: replace function name with __func__ in ram_block_discard_range(), Xiaoyao Li, 2023/09/13
[RFC PATCH v2 15/21] physmem: extract ram_block_discard_range_fd() from ram_block_discard_range(), Xiaoyao Li, 2023/09/13
[RFC PATCH v2 17/21] kvm: handle KVM_EXIT_MEMORY_FAULT,
Xiaoyao Li <=
[RFC PATCH v2 16/21] physmem: Introduce ram_block_convert_range(), Xiaoyao Li, 2023/09/13
[RFC PATCH v2 18/21] trace/kvm: Add trace for page convertion between shared and private, Xiaoyao Li, 2023/09/13
[RFC PATCH v2 19/21] pci-host/q35: Move PAM initialization above SMRAM initialization, Xiaoyao Li, 2023/09/13
[RFC PATCH v2 20/21] q35: Introduce smm_ranges property for q35-pci-host, Xiaoyao Li, 2023/09/13
[RFC PATCH v2 21/21] i386: Disable SMM mode for X86_SW_PROTECTED_VM, Xiaoyao Li, 2023/09/13
Re: [RFC PATCH v2 00/21] QEMU gmem implemention, David Hildenbrand, 2023/09/14