[PW_SID:1119717] Implement Eager Page Splitting for RISC-V by linux-riscv-bot · Pull Request #2190 · linux-riscv/linux

linux-riscv-bot · 2026-07-01T14:19:32Z

PR for series 1119717 applied to workflow__riscv__fixes

Name: Implement Eager Page Splitting for RISC-V
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1119717
Version: 4

Add the split page cache for dirty logging enablement and the KVM_CLEAR_DIRTY_LOG ioctl. Signed-off-by: Wang Yechao <wang.yechao255@zte.com.cn> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Split huge pages eagerly when enabling dirty logging. The goal is to avoid doing it while faulting on write-protected pages, which negatively impacts guest performance. The benefits of eager page splitting are the same as in x86 and arm64, added with commit a3fe5db ("KVM: x86/mmu: Split huge pages mapped by the TDP MMU when dirty logging is enabled") and commit e7bf7a4 ("KVM: arm64: Split huge pages when dirty logging is enabled") Signed-off-by: Wang Yechao <wang.yechao255@zte.com.cn> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

The function kvm_arch_mmu_enable_log_dirty_pt_masked() is invoked from two distinct call paths: kvm_clear_dirty_log_protect() kvm_arch_mmu_enable_log_dirty_pt_masked() kvm_vm_ioctl_reset_dirty_pages() kvm_dirty_ring_reset() kvm_reset_dirty_gfn() kvm_arch_mmu_enable_log_dirty_pt_masked() In both scenarios, the caller already performs a remote TLB flush after dirty logging is enabled, so the TLB flush inside kvm_arch_mmu_enable_log_dirty_pt_masked() is unnecessary. Remove it. Signed-off-by: Wang Yechao <wang.yechao255@zte.com.cn> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Split huge pages on the range specified using KVM_CLEAR_DIRTY_LOG. And do not split when enabling dirty logging if KVM_DIRTY_LOG_INITIALLY_SET is set. Signed-off-by: Wang Yechao <wang.yechao255@zte.com.cn> Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Add an eager_page_split module parameter for RISC-V KVM, following the same approach as on x86. This parameter controls whether eager page splitting is enabled. The default value is on. When eager page splitting is enabled, KVM proactively splits large pages (huge pages) into smaller pages when needed for dirty logging or other operations. Disabling it can be beneficial for VM workloads that rarely perform writes, or that only write to a small region of memory, as it allows huge pages to remain intact for read accesses. Signed-off-by: Wang Yechao <wang.yechao255@zte.com.cn> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot · 2026-07-01T15:15:18Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 121.73 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T15:35:06Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1185.82 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T15:59:37Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1469.52 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:00:00Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 21.80 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:00:26Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 23.56 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:00:28Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.98 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:01:51Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 80.50 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:01:53Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:01:55Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
kdoc
Desc: Detects for kdoc errors
Duration: 0.74 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:01:57Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
module-param
Desc: Detect module_param changes
Duration: 0.46 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:01:59Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:02:01Z

Patch 1: "[v4,1/5] RISC-V: KVM: Add the split page cache for ioctl context"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.27 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:04:19Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 120.67 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:24:08Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1188.26 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:48:35Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1465.20 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:48:58Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 22.04 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:49:24Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 23.70 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:49:27Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 1.99 seconds
Result: WARNING
Output:

CHECK: Alignment should match open parenthesis
#144: FILE: arch/riscv/kvm/mmu.c:128:
+				kvm_flush_remote_tlbs_range(kvm, last_flush_gfn,
+					  (addr >> PAGE_SHIFT) - last_flush_gfn);

total: 0 errors, 0 warnings, 1 checks, 168 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 644485e25944 ("RISC-V: KVM: Split huge pages when dirty logging is enabled") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 0 warnings, 1 checks, 168 lines checked
CHECK: Alignment should match open parenthesis

linux-riscv-bot · 2026-07-01T16:50:50Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 81.11 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:50:51Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:50:54Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
kdoc
Desc: Detects for kdoc errors
Duration: 0.75 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:50:55Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
module-param
Desc: Detect module_param changes
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:50:57Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.22 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T16:50:59Z

Patch 2: "[v4,2/5] RISC-V: KVM: Split huge pages when dirty logging is enabled"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.26 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T17:38:30Z

Patch 3: "[v4,3/5] RISC-V: KVM: Remove redundant TLB flush operations"
module-param
Desc: Detect module_param changes
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T17:38:32Z

Patch 3: "[v4,3/5] RISC-V: KVM: Remove redundant TLB flush operations"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.22 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T17:38:33Z

Patch 3: "[v4,3/5] RISC-V: KVM: Remove redundant TLB flush operations"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.26 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T17:40:48Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 118.63 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:00:00Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1150.96 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:24:00Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1437.75 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:24:23Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 22.08 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:24:48Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 23.47 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:24:50Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.59 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:26:13Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 81.25 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:26:15Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:26:17Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
kdoc
Desc: Detects for kdoc errors
Duration: 0.74 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:26:19Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
module-param
Desc: Detect module_param changes
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:26:21Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.22 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:26:22Z

Patch 4: "[v4,4/5] RISC-V: KVM: Split huge pages during KVM_CLEAR_DIRTY_LOG"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.26 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:28:40Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 122.56 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T18:47:42Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1139.83 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T19:11:45Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1441.72 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T19:12:08Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 21.85 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T19:12:34Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 23.89 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T19:12:36Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.82 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T19:13:56Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 78.90 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T19:13:58Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T19:14:01Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
kdoc
Desc: Detects for kdoc errors
Duration: 0.77 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T19:14:03Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
module-param
Desc: Detect module_param changes
Duration: 1.19 seconds
Result: ERROR
Output:

Was 0 now: 1
Detected module_param
+module_param(eager_page_split, bool, 0644);

linux-riscv-bot · 2026-07-01T19:14:05Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-07-01T19:14:07Z

Patch 5: "[v4,5/5] RISC-V: KVM: Add the eager_page_split module parameter"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.27 seconds
Result: PASS

Linux RISC-V bot and others added 6 commits July 1, 2026 03:48

Adding CI files

89be0ce

RISC-V: KVM: Add the split page cache for ioctl context

9cd42d1

Add the split page cache for dirty logging enablement and the KVM_CLEAR_DIRTY_LOG ioctl. Signed-off-by: Wang Yechao <wang.yechao255@zte.com.cn> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot force-pushed the workflow__riscv__fixes branch from 89be0ce to dc5ff20 Compare July 7, 2026 03:25

linux-riscv-bot closed this Jul 8, 2026

linux-riscv-bot deleted the pw1119717 branch July 8, 2026 05:09

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