[RFC,2/6] accel/kvm: Keep track of the HWPoisonPage sizes

Commit Message

William Roche Sept. 10, 2024, 9:07 a.m. UTC

From: William Roche <[e-mail]>

Add the page size information to the hwpoison_page_list elements.

Signed-off-by: William Roche <[e-mail]>
---
 accel/kvm/kvm-all.c      | 11 +++++++----
 include/sysemu/kvm.h     |  3 ++-
 include/sysemu/kvm_int.h |  3 ++-
 target/arm/kvm.c         |  5 +++--
 target/i386/kvm/kvm.c    |  5 +++--
 5 files changed, 17 insertions(+), 10 deletions(-)

Patch

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 409c5d3ce6..bcccf80bd7 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -1200,6 +1200,7 @@  int kvm_vm_check_extension(KVMState *s, unsigned int extension)
  */
 typedef struct HWPoisonPage {
     ram_addr_t ram_addr;
+    size_t     page_size;
     QLIST_ENTRY(HWPoisonPage) list;
 } HWPoisonPage;
 
@@ -1212,12 +1213,12 @@  static void kvm_unpoison_all(void *param)
 
     QLIST_FOREACH_SAFE(page, &hwpoison_page_list, list, next_page) {
         QLIST_REMOVE(page, list);
-        qemu_ram_remap(page->ram_addr, TARGET_PAGE_SIZE);
+        qemu_ram_remap(page->ram_addr, page->page_size);
         g_free(page);
     }
 }
 
-void kvm_hwpoison_page_add(ram_addr_t ram_addr)
+void kvm_hwpoison_page_add(ram_addr_t ram_addr, size_t sz)
 {
     HWPoisonPage *page;
 
@@ -1228,6 +1229,7 @@  void kvm_hwpoison_page_add(ram_addr_t ram_addr)
     }
     page = g_new(HWPoisonPage, 1);
     page->ram_addr = ram_addr;
+    page->page_size = sz;
     QLIST_INSERT_HEAD(&hwpoison_page_list, page, list);
 }
 
@@ -3031,7 +3033,8 @@  int kvm_cpu_exec(CPUState *cpu)
         if (unlikely(have_sigbus_pending)) {
             bql_lock();
             kvm_arch_on_sigbus_vcpu(cpu, pending_sigbus_code,
-                                    pending_sigbus_addr);
+                                    pending_sigbus_addr,
+                                    pending_sigbus_addr_lsb);
             have_sigbus_pending = false;
             bql_unlock();
         }
@@ -3569,7 +3572,7 @@  int kvm_on_sigbus(int code, void *addr, short addr_lsb)
      * we can only get action optional here.
      */
     assert(code != BUS_MCEERR_AR);
-    kvm_arch_on_sigbus_vcpu(first_cpu, code, addr);
+    kvm_arch_on_sigbus_vcpu(first_cpu, code, addr, addr_lsb);
     return 0;
 #else
     return 1;
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 21262eb970..c8c0d52bed 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -383,7 +383,8 @@  bool kvm_vcpu_id_is_valid(int vcpu_id);
 unsigned long kvm_arch_vcpu_id(CPUState *cpu);
 
 #ifdef KVM_HAVE_MCE_INJECTION
-void kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr);
+void kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr,
+                             short addr_lsb);
 #endif
 
 void kvm_arch_init_irq_routing(KVMState *s);
diff --git a/include/sysemu/kvm_int.h b/include/sysemu/kvm_int.h
index 1d8fb1473b..753e4bc6ef 100644
--- a/include/sysemu/kvm_int.h
+++ b/include/sysemu/kvm_int.h
@@ -168,10 +168,11 @@  void kvm_set_max_memslot_size(hwaddr max_slot_size);
  *
  * Parameters:
  *  @ram_addr: the address in the RAM for the poisoned page
+ *  @sz: size of the poison page as reported by the kernel
  *
  * Add a poisoned page to the list
  *
  * Return: None.
  */
-void kvm_hwpoison_page_add(ram_addr_t ram_addr);
+void kvm_hwpoison_page_add(ram_addr_t ram_addr, size_t sz);
 #endif
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index 849e2e21b3..f62e53e423 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -2348,10 +2348,11 @@  int kvm_arch_get_registers(CPUState *cs)
     return ret;
 }
 
-void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
+void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr, short addr_lsb)
 {
     ram_addr_t ram_addr;
     hwaddr paddr;
+    size_t sz = (addr_lsb > 0) ? (1 << addr_lsb) : TARGET_PAGE_SIZE;
 
     assert(code == BUS_MCEERR_AR || code == BUS_MCEERR_AO);
 
@@ -2359,7 +2360,7 @@  void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
         ram_addr = qemu_ram_addr_from_host(addr);
         if (ram_addr != RAM_ADDR_INVALID &&
             kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)) {
-            kvm_hwpoison_page_add(ram_addr);
+            kvm_hwpoison_page_add(ram_addr, sz);
             /*
              * If this is a BUS_MCEERR_AR, we know we have been called
              * synchronously from the vCPU thread, so we can easily
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 2fa88ef1e3..99b87140cc 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -714,12 +714,13 @@  static void hardware_memory_error(void *host_addr)
     exit(1);
 }
 
-void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
+void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr, short addr_lsb)
 {
     X86CPU *cpu = X86_CPU(c);
     CPUX86State *env = &cpu->env;
     ram_addr_t ram_addr;
     hwaddr paddr;
+    size_t sz = (addr_lsb > 0) ? (1 << addr_lsb) : TARGET_PAGE_SIZE;
 
     /* If we get an action required MCE, it has been injected by KVM
      * while the VM was running.  An action optional MCE instead should
@@ -732,7 +733,7 @@  void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
         ram_addr = qemu_ram_addr_from_host(addr);
         if (ram_addr != RAM_ADDR_INVALID &&
             kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)) {
-            kvm_hwpoison_page_add(ram_addr);
+            kvm_hwpoison_page_add(ram_addr, sz);
             kvm_mce_inject(cpu, paddr, code);
 
             /*