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Message-ID: <327dadf390b5e397074e5bcc9f85468b1467f9a6.1726009989.git.ackerleytng@google.com>
Date: Tue, 10 Sep 2024 23:43:49 +0000
From: Ackerley Tng <ackerleytng@...gle.com>
To: tabba@...gle.com, quic_eberman@...cinc.com, roypat@...zon.co.uk,
jgg@...dia.com, peterx@...hat.com, david@...hat.com, rientjes@...gle.com,
fvdl@...gle.com, jthoughton@...gle.com, seanjc@...gle.com,
pbonzini@...hat.com, zhiquan1.li@...el.com, fan.du@...el.com,
jun.miao@...el.com, isaku.yamahata@...el.com, muchun.song@...ux.dev,
mike.kravetz@...cle.com
Cc: erdemaktas@...gle.com, vannapurve@...gle.com, ackerleytng@...gle.com,
qperret@...gle.com, jhubbard@...dia.com, willy@...radead.org,
shuah@...nel.org, brauner@...nel.org, bfoster@...hat.com,
kent.overstreet@...ux.dev, pvorel@...e.cz, rppt@...nel.org,
richard.weiyang@...il.com, anup@...infault.org, haibo1.xu@...el.com,
ajones@...tanamicro.com, vkuznets@...hat.com, maciej.wieczor-retman@...el.com,
pgonda@...gle.com, oliver.upton@...ux.dev, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-fsdevel@...ck.org
Subject: [RFC PATCH 18/39] KVM: selftests: Support various types of backing
sources for private memory
Adds support for various type of backing sources for private
memory (in the sense of confidential computing), similar to the
backing sources available for shared memory.
Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
.../testing/selftests/kvm/include/test_util.h | 16 ++++
tools/testing/selftests/kvm/lib/test_util.c | 74 +++++++++++++++++++
2 files changed, 90 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index 3e473058849f..011e757d4e2c 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -142,6 +142,16 @@ struct vm_mem_backing_src_alias {
uint32_t flag;
};
+enum vm_private_mem_backing_src_type {
+ VM_PRIVATE_MEM_SRC_GUEST_MEM, /* Use default page size */
+ VM_PRIVATE_MEM_SRC_HUGETLB, /* Use kernel default page size for hugetlb pages */
+ VM_PRIVATE_MEM_SRC_HUGETLB_2MB,
+ VM_PRIVATE_MEM_SRC_HUGETLB_1GB,
+ NUM_PRIVATE_MEM_SRC_TYPES,
+};
+
+#define DEFAULT_VM_PRIVATE_MEM_SRC VM_PRIVATE_MEM_SRC_GUEST_MEM
+
#define MIN_RUN_DELAY_NS 200000UL
bool thp_configured(void);
@@ -152,6 +162,12 @@ size_t get_backing_src_pagesz(uint32_t i);
bool is_backing_src_hugetlb(uint32_t i);
void backing_src_help(const char *flag);
enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name);
+
+void private_mem_backing_src_help(const char *flag);
+enum vm_private_mem_backing_src_type parse_private_mem_backing_src_type(const char *type_name);
+const struct vm_mem_backing_src_alias *vm_private_mem_backing_src_alias(uint32_t i);
+size_t get_private_mem_backing_src_pagesz(uint32_t i);
+
long get_run_delay(void);
/*
diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
index 8ed0b74ae837..d0a9b5ee0c01 100644
--- a/tools/testing/selftests/kvm/lib/test_util.c
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -15,6 +15,7 @@
#include <sys/syscall.h>
#include <linux/mman.h>
#include "linux/kernel.h"
+#include <linux/kvm.h>
#include "test_util.h"
@@ -288,6 +289,34 @@ const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i)
return &aliases[i];
}
+const struct vm_mem_backing_src_alias *vm_private_mem_backing_src_alias(uint32_t i)
+{
+ static const struct vm_mem_backing_src_alias aliases[] = {
+ [VM_PRIVATE_MEM_SRC_GUEST_MEM] = {
+ .name = "private_mem_guest_mem",
+ .flag = 0,
+ },
+ [VM_PRIVATE_MEM_SRC_HUGETLB] = {
+ .name = "private_mem_hugetlb",
+ .flag = KVM_GUEST_MEMFD_HUGETLB,
+ },
+ [VM_PRIVATE_MEM_SRC_HUGETLB_2MB] = {
+ .name = "private_mem_hugetlb_2mb",
+ .flag = KVM_GUEST_MEMFD_HUGETLB | KVM_GUEST_MEMFD_HUGE_2MB,
+ },
+ [VM_PRIVATE_MEM_SRC_HUGETLB_1GB] = {
+ .name = "private_mem_hugetlb_1gb",
+ .flag = KVM_GUEST_MEMFD_HUGETLB | KVM_GUEST_MEMFD_HUGE_1GB,
+ },
+ };
+ _Static_assert(ARRAY_SIZE(aliases) == NUM_PRIVATE_MEM_SRC_TYPES,
+ "Missing new backing private mem src types?");
+
+ TEST_ASSERT(i < NUM_PRIVATE_MEM_SRC_TYPES, "Private mem backing src type ID %d too big", i);
+
+ return &aliases[i];
+}
+
#define MAP_HUGE_PAGE_SIZE(x) (1ULL << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK))
size_t get_backing_src_pagesz(uint32_t i)
@@ -308,6 +337,20 @@ size_t get_backing_src_pagesz(uint32_t i)
}
}
+size_t get_private_mem_backing_src_pagesz(uint32_t i)
+{
+ uint32_t flag = vm_private_mem_backing_src_alias(i)->flag;
+
+ switch (i) {
+ case VM_PRIVATE_MEM_SRC_GUEST_MEM:
+ return getpagesize();
+ case VM_PRIVATE_MEM_SRC_HUGETLB:
+ return get_def_hugetlb_pagesz();
+ default:
+ return MAP_HUGE_PAGE_SIZE(flag);
+ }
+}
+
bool is_backing_src_hugetlb(uint32_t i)
{
return !!(vm_mem_backing_src_alias(i)->flag & MAP_HUGETLB);
@@ -344,6 +387,37 @@ enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name)
return -1;
}
+static void print_available_private_mem_backing_src_types(const char *prefix)
+{
+ int i;
+
+ printf("%sAvailable private mem backing src types:\n", prefix);
+
+ for (i = 0; i < NUM_PRIVATE_MEM_SRC_TYPES; i++)
+ printf("%s %s\n", prefix, vm_private_mem_backing_src_alias(i)->name);
+}
+
+void private_mem_backing_src_help(const char *flag)
+{
+ printf(" %s: specify the type of memory that should be used to\n"
+ " back guest private memory. (default: %s)\n",
+ flag, vm_private_mem_backing_src_alias(DEFAULT_VM_PRIVATE_MEM_SRC)->name);
+ print_available_private_mem_backing_src_types(" ");
+}
+
+enum vm_private_mem_backing_src_type parse_private_mem_backing_src_type(const char *type_name)
+{
+ int i;
+
+ for (i = 0; i < NUM_PRIVATE_MEM_SRC_TYPES; i++)
+ if (!strcmp(type_name, vm_private_mem_backing_src_alias(i)->name))
+ return i;
+
+ print_available_private_mem_backing_src_types("");
+ TEST_FAIL("Unknown private mem backing src type: %s", type_name);
+ return -1;
+}
+
long get_run_delay(void)
{
char path[64];
--
2.46.0.598.g6f2099f65c-goog
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