| Message ID | 20241013184733.1423747-2-richard.henderson@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | target/i386: Use probe_access_full_mmu in ptw_translate | expand |
On 10/13/24 11:47, Richard Henderson wrote: > Suggested-by: Alex Bennée <alex.bennee@linaro.org> > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > include/exec/exec-all.h | 29 ++++++++++++++--------------- > 1 file changed, 14 insertions(+), 15 deletions(-) > > diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h > index 72240ef426..2e4c4cc4b4 100644 > --- a/include/exec/exec-all.h > +++ b/include/exec/exec-all.h > @@ -368,6 +368,13 @@ int probe_access_flags(CPUArchState *env, vaddr addr, int size, > * The CPUTLBEntryFull structure returned via @pfull is transient > * and must be consumed or copied immediately, before any further > * access or changes to TLB @mmu_idx. > + * > + * This function will not fault if @nonfault is set, but will > + * return TLB_INVALID_MASK if the page is not mapped, or is not > + * accessible with @access_type. > + * > + * This function will return TLB_MMIO in order to force the access > + * to be handled out-of-line if plugins wish to instrument the access. > */ > int probe_access_full(CPUArchState *env, vaddr addr, int size, > MMUAccessType access_type, int mmu_idx, > @@ -375,22 +382,14 @@ int probe_access_full(CPUArchState *env, vaddr addr, int size, > CPUTLBEntryFull **pfull, uintptr_t retaddr); > > /** > - * probe_access_mmu() - Like probe_access_full except cannot fault and > - * doesn't trigger instrumentation. > + * probe_access_full_mmu: > + * Like probe_access_full, except: > * > - * @env: CPUArchState > - * @vaddr: virtual address to probe > - * @size: size of the probe > - * @access_type: read, write or execute permission > - * @mmu_idx: softmmu index > - * @phost: ptr to return value host address or NULL > - * @pfull: ptr to return value CPUTLBEntryFull structure or NULL > - * > - * The CPUTLBEntryFull structure returned via @pfull is transient > - * and must be consumed or copied immediately, before any further > - * access or changes to TLB @mmu_idx. > - * > - * Returns: TLB flags as per probe_access_flags() > + * This function is intended to be used for page table accesses by > + * the target mmu itself. Since such page walking happens while > + * handling another potential mmu fault, this function never raises > + * exceptions (akin to @nonfault true for probe_access_full). > + * Likewise this function does not trigger plugin instrumentation. > */ > int probe_access_full_mmu(CPUArchState *env, vaddr addr, int size, > MMUAccessType access_type, int mmu_idx, Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Richard Henderson <richard.henderson@linaro.org> writes: > Suggested-by: Alex Bennée <alex.bennee@linaro.org> > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h index 72240ef426..2e4c4cc4b4 100644 --- a/include/exec/exec-all.h +++ b/include/exec/exec-all.h @@ -368,6 +368,13 @@ int probe_access_flags(CPUArchState *env, vaddr addr, int size, * The CPUTLBEntryFull structure returned via @pfull is transient * and must be consumed or copied immediately, before any further * access or changes to TLB @mmu_idx. + * + * This function will not fault if @nonfault is set, but will + * return TLB_INVALID_MASK if the page is not mapped, or is not + * accessible with @access_type. + * + * This function will return TLB_MMIO in order to force the access + * to be handled out-of-line if plugins wish to instrument the access. */ int probe_access_full(CPUArchState *env, vaddr addr, int size, MMUAccessType access_type, int mmu_idx, @@ -375,22 +382,14 @@ int probe_access_full(CPUArchState *env, vaddr addr, int size, CPUTLBEntryFull **pfull, uintptr_t retaddr); /** - * probe_access_mmu() - Like probe_access_full except cannot fault and - * doesn't trigger instrumentation. + * probe_access_full_mmu: + * Like probe_access_full, except: * - * @env: CPUArchState - * @vaddr: virtual address to probe - * @size: size of the probe - * @access_type: read, write or execute permission - * @mmu_idx: softmmu index - * @phost: ptr to return value host address or NULL - * @pfull: ptr to return value CPUTLBEntryFull structure or NULL - * - * The CPUTLBEntryFull structure returned via @pfull is transient - * and must be consumed or copied immediately, before any further - * access or changes to TLB @mmu_idx. - * - * Returns: TLB flags as per probe_access_flags() + * This function is intended to be used for page table accesses by + * the target mmu itself. Since such page walking happens while + * handling another potential mmu fault, this function never raises + * exceptions (akin to @nonfault true for probe_access_full). + * Likewise this function does not trigger plugin instrumentation. */ int probe_access_full_mmu(CPUArchState *env, vaddr addr, int size, MMUAccessType access_type, int mmu_idx,
Suggested-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- include/exec/exec-all.h | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-)