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Wed, 22 May 2024 06:17:09 -0700 (PDT) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , George Dunlap Subject: [PATCH v2 1/4] x86/shadow: Rework trace_shadow_gen() into sh_trace_va() Date: Wed, 22 May 2024 14:17:00 +0100 Message-Id: <20240522131703.30839-2-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240522131703.30839-1-andrew.cooper3@citrix.com> References: <20240522131703.30839-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1716383849955100002 The ((GUEST_PAGING_LEVELS - 2) << 8) expression in the event field is common to all shadow trace events, so introduce sh_trace() as a very thin wrapper around trace(). Then, rename trace_shadow_gen() to sh_trace_va() to better describe what it= is doing, and to be more consistent with later cleanup. No functional change. Signed-off-by: Andrew Cooper Reviewed-by: Jan Beulich --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: George Dunlap v2: * New --- xen/arch/x86/mm/shadow/multi.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c index bcd02b2d0037..1775952d7e18 100644 --- a/xen/arch/x86/mm/shadow/multi.c +++ b/xen/arch/x86/mm/shadow/multi.c @@ -1974,13 +1974,17 @@ typedef u32 guest_va_t; typedef u32 guest_pa_t; #endif =20 -static inline void trace_shadow_gen(u32 event, guest_va_t va) +/* Shadow trace event with GUEST_PAGING_LEVELS folded into the event field= . */ +static void sh_trace(uint32_t event, unsigned int extra, const void *extra= _data) +{ + trace(event | ((GUEST_PAGING_LEVELS - 2) << 8), extra, extra_data); +} + +/* Shadow trace event with the guest's linear address. */ +static void sh_trace_va(uint32_t event, guest_va_t va) { if ( tb_init_done ) - { - event |=3D (GUEST_PAGING_LEVELS-2)<<8; - trace(event, sizeof(va), &va); - } + sh_trace(event, sizeof(va), &va); } =20 static inline void trace_shadow_fixup(guest_l1e_t gl1e, @@ -2239,7 +2243,7 @@ static int cf_check sh_page_fault( sh_reset_early_unshadow(v); perfc_incr(shadow_fault_fast_gnp); SHADOW_PRINTK("fast path not-present\n"); - trace_shadow_gen(TRC_SHADOW_FAST_PROPAGATE, va); + sh_trace_va(TRC_SHADOW_FAST_PROPAGATE, va); return 0; } #ifdef CONFIG_HVM @@ -2250,7 +2254,7 @@ static int cf_check sh_page_fault( perfc_incr(shadow_fault_fast_mmio); SHADOW_PRINTK("fast path mmio %#"PRIpaddr"\n", gpa); sh_reset_early_unshadow(v); - trace_shadow_gen(TRC_SHADOW_FAST_MMIO, va); + sh_trace_va(TRC_SHADOW_FAST_MMIO, va); return handle_mmio_with_translation(va, gpa >> PAGE_SHIFT, acc= ess) ? EXCRET_fault_fixed : 0; #else @@ -2265,7 +2269,7 @@ static int cf_check sh_page_fault( * Retry and let the hardware give us the right fault next tim= e. */ perfc_incr(shadow_fault_fast_fail); SHADOW_PRINTK("fast path false alarm!\n"); - trace_shadow_gen(TRC_SHADOW_FALSE_FAST_PATH, va); + sh_trace_va(TRC_SHADOW_FALSE_FAST_PATH, va); return EXCRET_fault_fixed; } } @@ -2481,7 +2485,7 @@ static int cf_check sh_page_fault( #endif paging_unlock(d); put_gfn(d, gfn_x(gfn)); - trace_shadow_gen(TRC_SHADOW_DOMF_DYING, va); + sh_trace_va(TRC_SHADOW_DOMF_DYING, va); return 0; } =20 @@ -2569,7 +2573,7 @@ static int cf_check sh_page_fault( put_gfn(d, gfn_x(gfn)); =20 perfc_incr(shadow_fault_mmio); - trace_shadow_gen(TRC_SHADOW_MMIO, va); + sh_trace_va(TRC_SHADOW_MMIO, va); =20 return handle_mmio_with_translation(va, gpa >> PAGE_SHIFT, access) ? 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Wed, 22 May 2024 06:17:11 -0700 (PDT) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , George Dunlap Subject: [PATCH v2 2/4] x86/shadow: Introduce sh_trace_gl1e_va() Date: Wed, 22 May 2024 14:17:01 +0100 Message-Id: <20240522131703.30839-3-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240522131703.30839-1-andrew.cooper3@citrix.com> References: <20240522131703.30839-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1716383853991100001 trace_shadow_fixup() and trace_not_shadow_fault() both write out identical trace records. Reimplement them in terms of a common sh_trace_gl1e_va(). There's no need to pack the trace record, even in the case of PAE paging. No functional change. Signed-off-by: Andrew Cooper --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: George Dunlap v2: * New --- xen/arch/x86/mm/shadow/multi.c | 59 ++++++++++------------------------ 1 file changed, 17 insertions(+), 42 deletions(-) diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c index 1775952d7e18..f0a9cc527c0b 100644 --- a/xen/arch/x86/mm/shadow/multi.c +++ b/xen/arch/x86/mm/shadow/multi.c @@ -1987,51 +1987,26 @@ static void sh_trace_va(uint32_t event, guest_va_t = va) sh_trace(event, sizeof(va), &va); } =20 -static inline void trace_shadow_fixup(guest_l1e_t gl1e, - guest_va_t va) +/* Shadow trace event with a gl1e, linear address and flags. */ +static void sh_trace_gl1e_va(uint32_t event, guest_l1e_t gl1e, guest_va_t = va) { if ( tb_init_done ) { - struct __packed { - /* for PAE, guest_l1e may be 64 while guest_va may be 32; - so put it first for alignment sake. */ - guest_l1e_t gl1e; - guest_va_t va; - u32 flags; - } d; - u32 event; - - event =3D TRC_SHADOW_FIXUP | ((GUEST_PAGING_LEVELS-2)<<8); - - d.gl1e =3D gl1e; - d.va =3D va; - d.flags =3D this_cpu(trace_shadow_path_flags); - - trace(event, sizeof(d), &d); - } -} - -static inline void trace_not_shadow_fault(guest_l1e_t gl1e, - guest_va_t va) -{ - if ( tb_init_done ) - { - struct __packed { - /* for PAE, guest_l1e may be 64 while guest_va may be 32; - so put it first for alignment sake. */ + struct { + /* + * For GUEST_PAGING_LEVELS=3D3 (PAE paging), guest_l1e is 64 w= hile + * guest_va is 32. Put it first to avoid padding. + */ guest_l1e_t gl1e; guest_va_t va; - u32 flags; - } d; - u32 event; - - event =3D TRC_SHADOW_NOT_SHADOW | ((GUEST_PAGING_LEVELS-2)<<8); - - d.gl1e =3D gl1e; - d.va =3D va; - d.flags =3D this_cpu(trace_shadow_path_flags); - - trace(event, sizeof(d), &d); + uint32_t flags; + } d =3D { + .gl1e =3D gl1e, + .va =3D va, + .flags =3D this_cpu(trace_shadow_path_flags), + }; + + sh_trace(event, sizeof(d), &d); } } =20 @@ -2603,7 +2578,7 @@ static int cf_check sh_page_fault( d->arch.paging.log_dirty.fault_count++; sh_reset_early_unshadow(v); =20 - trace_shadow_fixup(gw.l1e, va); + sh_trace_gl1e_va(TRC_SHADOW_FIXUP, gw.l1e, va); done: __maybe_unused; sh_audit_gw(v, &gw); SHADOW_PRINTK("fixed\n"); @@ -2857,7 +2832,7 @@ static int cf_check sh_page_fault( put_gfn(d, gfn_x(gfn)); =20 propagate: - trace_not_shadow_fault(gw.l1e, va); + sh_trace_gl1e_va(TRC_SHADOW_NOT_SHADOW, gw.l1e, va); =20 return 0; } --=20 2.30.2 From nobody Fri Nov 22 13:02:53 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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Wed, 22 May 2024 06:17:12 -0700 (PDT) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , George Dunlap Subject: [PATCH v2 3/4] x86/shadow: Rework trace_shadow_emulate_other() as sh_trace_gfn_va() Date: Wed, 22 May 2024 14:17:02 +0100 Message-Id: <20240522131703.30839-4-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240522131703.30839-1-andrew.cooper3@citrix.com> References: <20240522131703.30839-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1716383856217100001 sh_trace_gfn_va() is very similar to sh_trace_gl1e_va(), and a rather short= er name than trace_shadow_emulate_other(). Like sh_trace_gl1e_va(), there is = no need to pack the trace record. No functional change. Signed-off-by: Andrew Cooper --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: George Dunlap v2: * New --- xen/arch/x86/mm/shadow/multi.c | 40 ++++++++++++++++------------------ 1 file changed, 19 insertions(+), 21 deletions(-) diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c index f0a9cc527c0b..d2fe4e148fe0 100644 --- a/xen/arch/x86/mm/shadow/multi.c +++ b/xen/arch/x86/mm/shadow/multi.c @@ -2010,29 +2010,30 @@ static void sh_trace_gl1e_va(uint32_t event, guest_= l1e_t gl1e, guest_va_t va) } } =20 -static inline void trace_shadow_emulate_other(u32 event, - guest_va_t va, - gfn_t gfn) +/* Shadow trace event with a gfn, linear address and flags. */ +static void sh_trace_gfn_va(uint32_t event, gfn_t gfn, guest_va_t va) { if ( tb_init_done ) { - struct __packed { - /* for PAE, guest_l1e may be 64 while guest_va may be 32; - so put it first for alignment sake. */ + struct { + /* + * For GUEST_PAGING_LEVELS=3D3 (PAE paging), gfn is 64 while + * guest_va is 32. Put it first to avoid padding. + */ #if GUEST_PAGING_LEVELS =3D=3D 2 - u32 gfn; + uint32_t gfn; #else - u64 gfn; + uint64_t gfn; #endif guest_va_t va; - } d; - - event |=3D ((GUEST_PAGING_LEVELS-2)<<8); - - d.gfn=3Dgfn_x(gfn); - d.va =3D va; + uint32_t flags; + } d =3D { + .gfn =3D gfn_x(gfn), + .va =3D va, + .flags =3D this_cpu(trace_shadow_path_flags), + }; =20 - trace(event, sizeof(d), &d); + sh_trace(event, sizeof(d), &d); } } =20 @@ -2603,8 +2604,7 @@ static int cf_check sh_page_fault( mfn_x(gmfn)); perfc_incr(shadow_fault_emulate_failed); shadow_remove_all_shadows(d, gmfn); - trace_shadow_emulate_other(TRC_SHADOW_EMULATE_UNSHADOW_USER, - va, gfn); + sh_trace_gfn_va(TRC_SHADOW_EMULATE_UNSHADOW_USER, gfn, va); goto done; } =20 @@ -2683,8 +2683,7 @@ static int cf_check sh_page_fault( } #endif shadow_remove_all_shadows(d, gmfn); - trace_shadow_emulate_other(TRC_SHADOW_EMULATE_UNSHADOW_EVTINJ, - va, gfn); + sh_trace_gfn_va(TRC_SHADOW_EMULATE_UNSHADOW_EVTINJ, gfn, va); return EXCRET_fault_fixed; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1716383857989100003 From: Jan Beulich The emulation_count field is set only conditionally right now. Convert all field setting to an initializer, thus guaranteeing that field to be set to 0 (default initialized) when GUEST_PAGING_LEVELS !=3D 3. Rework trace_shadow_emulate() to be consistent with the other trace helpers. Coverity-ID: 1598430 Fixes: 9a86ac1aa3d2 ("xentrace 5/7: Additional tracing for the shadow code") Signed-off-by: Jan Beulich Acked-by: Roger Pau Monn=C3=A9 Acked-by: Jan Beulich --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: George Dunlap v2: * Rebase over packing/sh_trace() cleanup. --- xen/arch/x86/mm/shadow/multi.c | 31 +++++++++++++++---------------- 1 file changed, 15 insertions(+), 16 deletions(-) diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c index d2fe4e148fe0..47dd1cc626b2 100644 --- a/xen/arch/x86/mm/shadow/multi.c +++ b/xen/arch/x86/mm/shadow/multi.c @@ -2063,30 +2063,29 @@ static void cf_check trace_emulate_write_val( #endif } =20 -static inline void trace_shadow_emulate(guest_l1e_t gl1e, unsigned long va) +static inline void sh_trace_emulate(guest_l1e_t gl1e, unsigned long va) { if ( tb_init_done ) { - struct __packed { - /* for PAE, guest_l1e may be 64 while guest_va may be 32; - so put it first for alignment sake. */ + struct { + /* + * For GUEST_PAGING_LEVELS=3D3 (PAE paging), guest_l1e is 64 w= hile + * guest_va is 32. Put it first to avoid padding. + */ guest_l1e_t gl1e, write_val; guest_va_t va; uint32_t flags:29, emulation_count:3; - } d; - u32 event; - - event =3D TRC_SHADOW_EMULATE | ((GUEST_PAGING_LEVELS-2)<<8); - - d.gl1e =3D gl1e; - d.write_val.l1 =3D this_cpu(trace_emulate_write_val); - d.va =3D va; + } d =3D { + .gl1e =3D gl1e, + .write_val.l1 =3D this_cpu(trace_emulate_write_val), + .va =3D va, #if GUEST_PAGING_LEVELS =3D=3D 3 - d.emulation_count =3D this_cpu(trace_extra_emulation_count); + .emulation_count =3D this_cpu(trace_extra_emulation_count), #endif - d.flags =3D this_cpu(trace_shadow_path_flags); + .flags =3D this_cpu(trace_shadow_path_flags), + }; =20 - trace(event, sizeof(d), &d); + sh_trace(TRC_SHADOW_EMULATE, sizeof(d), &d); } } #endif /* CONFIG_HVM */ @@ -2815,7 +2814,7 @@ static int cf_check sh_page_fault( } #endif /* PAE guest */ =20 - trace_shadow_emulate(gw.l1e, va); + sh_trace_emulate(gw.l1e, va); emulate_done: SHADOW_PRINTK("emulated\n"); return EXCRET_fault_fixed; --=20 2.30.2