Merging upstream version 6.9.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 46 insertions, 49 deletions

diff --git a/arch/loongarch/kvm/Kconfig b/arch/loongarch/kvm/Kconfig
index 61f7e33b1f..c4ef2b4d97 100644
--- a/arch/loongarch/kvm/Kconfig
+++ b/arch/loongarch/kvm/Kconfig
@@ -20,7 +20,6 @@ if VIRTUALIZATION
 config KVM
 	tristate "Kernel-based Virtual Machine (KVM) support"
 	depends on AS_HAS_LVZ_EXTENSION
-	depends on HAVE_KVM
 	select HAVE_KVM_DIRTY_RING_ACQ_REL
 	select HAVE_KVM_VCPU_ASYNC_IOCTL
 	select KVM_COMMON
@@ -28,6 +27,7 @@ config KVM
 	select KVM_GENERIC_HARDWARE_ENABLING
 	select KVM_GENERIC_MMU_NOTIFIER
 	select KVM_MMIO
+	select HAVE_KVM_READONLY_MEM
 	select KVM_XFER_TO_GUEST_WORK
 	help
 	  Support hosting virtualized guest machines using
diff --git a/arch/loongarch/kvm/mmu.c b/arch/loongarch/kvm/mmu.c
index 50a6acd7ff..a556cff357 100644
--- a/arch/loongarch/kvm/mmu.c
+++ b/arch/loongarch/kvm/mmu.c
@@ -723,7 +723,7 @@ static int host_pfn_mapping_level(struct kvm *kvm, gfn_t gfn,
 	/*
 	 * Read each entry once.  As above, a non-leaf entry can be promoted to
 	 * a huge page _during_ this walk.  Re-reading the entry could send the
-	 * walk into the weeks, e.g. p*d_large() returns false (sees the old
+	 * walk into the weeks, e.g. p*d_leaf() returns false (sees the old
 	 * value) and then p*d_offset() walks into the target huge page instead
 	 * of the old page table (sees the new value).
 	 */
diff --git a/arch/loongarch/kvm/switch.S b/arch/loongarch/kvm/switch.S
index ba976509bf..80e988985a 100644
--- a/arch/loongarch/kvm/switch.S
+++ b/arch/loongarch/kvm/switch.S
@@ -8,7 +8,7 @@
 #include <asm/asmmacro.h>
 #include <asm/loongarch.h>
 #include <asm/regdef.h>
-#include <asm/stackframe.h>
+#include <asm/unwind_hints.h>
 
 #define HGPR_OFFSET(x)		(PT_R0 + 8*x)
 #define GGPR_OFFSET(x)		(KVM_ARCH_GGPR + 8*x)
@@ -112,6 +112,7 @@
 	.text
 	.cfi_sections	.debug_frame
 SYM_CODE_START(kvm_exc_entry)
+	UNWIND_HINT_UNDEFINED
 	csrwr	a2,   KVM_TEMP_KS
 	csrrd	a2,   KVM_VCPU_KS
 	addi.d	a2,   a2, KVM_VCPU_ARCH
@@ -213,12 +214,6 @@ SYM_FUNC_START(kvm_enter_guest)
 	/* Save host GPRs */
 	kvm_save_host_gpr a2
 
-	/* Save host CRMD, PRMD to stack */
-	csrrd	a3, LOONGARCH_CSR_CRMD
-	st.d	a3, a2, PT_CRMD
-	csrrd	a3, LOONGARCH_CSR_PRMD
-	st.d	a3, a2, PT_PRMD
-
 	addi.d	a2, a1, KVM_VCPU_ARCH
 	st.d	sp, a2, KVM_ARCH_HSP
 	st.d	tp, a2, KVM_ARCH_HTP
@@ -279,3 +274,9 @@ SYM_FUNC_END(kvm_restore_lasx)
 	.section ".rodata"
 SYM_DATA(kvm_exception_size, .quad kvm_exc_entry_end - kvm_exc_entry)
 SYM_DATA(kvm_enter_guest_size, .quad kvm_enter_guest_end - kvm_enter_guest)
+
+#ifdef CONFIG_CPU_HAS_LBT
+STACK_FRAME_NON_STANDARD kvm_restore_fpu
+STACK_FRAME_NON_STANDARD kvm_restore_lsx
+STACK_FRAME_NON_STANDARD kvm_restore_lasx
+#endif
diff --git a/arch/loongarch/kvm/timer.c b/arch/loongarch/kvm/timer.c
index 111328f608..bcc6b6d063 100644
--- a/arch/loongarch/kvm/timer.c
+++ b/arch/loongarch/kvm/timer.c
@@ -23,24 +23,6 @@ static inline u64 tick_to_ns(struct kvm_vcpu *vcpu, u64 tick)
 	return div_u64(tick * MNSEC_PER_SEC, vcpu->arch.timer_mhz);
 }
 
-/*
- * Push timer forward on timeout.
- * Handle an hrtimer event by push the hrtimer forward a period.
- */
-static enum hrtimer_restart kvm_count_timeout(struct kvm_vcpu *vcpu)
-{
-	unsigned long cfg, period;
-
-	/* Add periodic tick to current expire time */
-	cfg = kvm_read_sw_gcsr(vcpu->arch.csr, LOONGARCH_CSR_TCFG);
-	if (cfg & CSR_TCFG_PERIOD) {
-		period = tick_to_ns(vcpu, cfg & CSR_TCFG_VAL);
-		hrtimer_add_expires_ns(&vcpu->arch.swtimer, period);
-		return HRTIMER_RESTART;
-	} else
-		return HRTIMER_NORESTART;
-}
-
 /* Low level hrtimer wake routine */
 enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer)
 {
@@ -50,7 +32,7 @@ enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer)
 	kvm_queue_irq(vcpu, INT_TI);
 	rcuwait_wake_up(&vcpu->wait);
 
-	return kvm_count_timeout(vcpu);
+	return HRTIMER_NORESTART;
 }
 
 /*
@@ -93,7 +75,8 @@ void kvm_restore_timer(struct kvm_vcpu *vcpu)
 	/*
 	 * Freeze the soft-timer and sync the guest stable timer with it.
 	 */
-	hrtimer_cancel(&vcpu->arch.swtimer);
+	if (kvm_vcpu_is_blocking(vcpu))
+		hrtimer_cancel(&vcpu->arch.swtimer);
 
 	/*
 	 * From LoongArch Reference Manual Volume 1 Chapter 7.6.2
@@ -168,26 +151,20 @@ static void _kvm_save_timer(struct kvm_vcpu *vcpu)
 	 * Here judge one-shot timer fired by checking whether TVAL is larger
 	 * than TCFG
 	 */
-	if (ticks < cfg) {
+	if (ticks < cfg)
 		delta = tick_to_ns(vcpu, ticks);
-		expire = ktime_add_ns(ktime_get(), delta);
-		vcpu->arch.expire = expire;
+	else
+		delta = 0;
+
+	expire = ktime_add_ns(ktime_get(), delta);
+	vcpu->arch.expire = expire;
+	if (kvm_vcpu_is_blocking(vcpu)) {
 
 		/*
 		 * HRTIMER_MODE_PINNED is suggested since vcpu may run in
 		 * the same physical cpu in next time
 		 */
 		hrtimer_start(&vcpu->arch.swtimer, expire, HRTIMER_MODE_ABS_PINNED);
-	} else if (vcpu->stat.generic.blocking) {
-		/*
-		 * Inject timer interrupt so that halt polling can dectect and exit.
-		 * VCPU is scheduled out already and sleeps in rcuwait queue and
-		 * will not poll pending events again. kvm_queue_irq() is not enough,
-		 * hrtimer swtimer should be used here.
-		 */
-		expire = ktime_add_ns(ktime_get(), 10);
-		vcpu->arch.expire = expire;
-		hrtimer_start(&vcpu->arch.swtimer, expire, HRTIMER_MODE_ABS_PINNED);
 	}
 }
 
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 36106922b5..3a8779065f 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -304,11 +304,18 @@ static int _kvm_get_cpucfg_mask(int id, u64 *v)
 		return -EINVAL;
 
 	switch (id) {
-	case 2:
+	case LOONGARCH_CPUCFG0:
+		*v = GENMASK(31, 0);
+		return 0;
+	case LOONGARCH_CPUCFG1:
+		/* CPUCFG1_MSGINT is not supported by KVM */
+		*v = GENMASK(25, 0);
+		return 0;
+	case LOONGARCH_CPUCFG2:
 		/* CPUCFG2 features unconditionally supported by KVM */
 		*v = CPUCFG2_FP     | CPUCFG2_FPSP  | CPUCFG2_FPDP     |
 		     CPUCFG2_FPVERS | CPUCFG2_LLFTP | CPUCFG2_LLFTPREV |
-		     CPUCFG2_LAM;
+		     CPUCFG2_LSPW | CPUCFG2_LAM;
 		/*
 		 * For the ISA extensions listed below, if one is supported
 		 * by the host, then it is also supported by KVM.
@@ -319,13 +326,25 @@ static int _kvm_get_cpucfg_mask(int id, u64 *v)
 			*v |= CPUCFG2_LASX;
 
 		return 0;
+	case LOONGARCH_CPUCFG3:
+		*v = GENMASK(16, 0);
+		return 0;
+	case LOONGARCH_CPUCFG4:
+	case LOONGARCH_CPUCFG5:
+		*v = GENMASK(31, 0);
+		return 0;
+	case LOONGARCH_CPUCFG16:
+		*v = GENMASK(16, 0);
+		return 0;
+	case LOONGARCH_CPUCFG17 ... LOONGARCH_CPUCFG20:
+		*v = GENMASK(30, 0);
+		return 0;
 	default:
 		/*
-		 * No restrictions on other valid CPUCFG IDs' values, but
-		 * CPUCFG data is limited to 32 bits as the LoongArch ISA
-		 * manual says (Volume 1, Section 2.2.10.5 "CPUCFG").
+		 * CPUCFG bits should be zero if reserved by HW or not
+		 * supported by KVM.
 		 */
-		*v = U32_MAX;
+		*v = 0;
 		return 0;
 	}
 }
@@ -344,7 +363,7 @@ static int kvm_check_cpucfg(int id, u64 val)
 		return -EINVAL;
 
 	switch (id) {
-	case 2:
+	case LOONGARCH_CPUCFG2:
 		if (!(val & CPUCFG2_LLFTP))
 			/* Guests must have a constant timer */
 			return -EINVAL;